Series comparison

-[PULL 0/3] tcg patch queue
+[PULL 00/15] tcg patch queue
-The following changes since commit 00483d386901173e84c7965f9f0d678791a75e01:
+The following changes since commit d37158bb2425e7ebffb167d611be01f1e9e6c86f:
-  Merge remote-tracking branch 'remotes/shorne/tags/or1k-pull-request' into staging (2022-02-28 11:27:16 +0000)
+  Update version for v8.0.0-rc2 release (2023-03-28 20:43:21 +0100)
 are available in the Git repository at:
-  https://gitlab.com/rth7680/qemu.git tags/pull-tcg-20220228
+  https://gitlab.com/rth7680/qemu.git tags/pull-tcg-20230328
-for you to fetch changes up to 2ccf40f00e3f29d85d4ff48a9a98870059002290:
+for you to fetch changes up to 87e303de70f93bf700f58412fb9b2c3ec918c4b5:
-  tcg/tci: Use tcg_out_ldst in tcg_out_st (2022-02-28 08:04:10 -1000)
+  softmmu: Restore use of CPU watchpoint for all accelerators (2023-03-28 15:24:06 -0700)
 ----------------------------------------------------------------
-Fix typecode generation for tcg helpers
+Use a local version of GTree [#285]
-Fix single stepping into interrupt handlers
+Fix page_set_flags vs the last page of the address space [#1528]
-Fix out-of-range offsets for stores in TCI
+Re-enable gdbstub breakpoints under KVM
 ----------------------------------------------------------------
-Luc Michel (1):
+Emilio Cota (2):
-      accel/tcg/cpu-exec: Fix precise single-stepping after interrupt
+      util: import GTree as QTree
       tcg: use QTree instead of GTree
-Richard Henderson (2):
+Philippe Mathieu-Daudé (3):
-      tcg: Remove dh_alias indirection for dh_typecode
+      softmmu: Restrict cpu_check_watchpoint / address_matches to TCG accel
-      tcg/tci: Use tcg_out_ldst in tcg_out_st
+      softmmu/watchpoint: Add missing 'qemu/error-report.h' include
       softmmu: Restore use of CPU watchpoint for all accelerators
- include/exec/helper-head.h   | 19 ++++++++++---------
+Richard Henderson (10):
- target/hppa/helper.h         |  2 ++
+      linux-user: Diagnose misaligned -R size
- target/i386/ops_sse_header.h |  3 +++
+      accel/tcg: Pass last not end to page_set_flags
- target/m68k/helper.h         |  1 +
+      accel/tcg: Pass last not end to page_reset_target_data
- target/ppc/helper.h          |  3 +++
+      accel/tcg: Pass last not end to PAGE_FOR_EACH_TB
- accel/tcg/cpu-exec.c         |  8 ++++++--
+      accel/tcg: Pass last not end to page_collection_lock
- tcg/tci/tcg-target.c.inc     |  5 ++---
+      accel/tcg: Pass last not end to tb_invalidate_phys_page_range__locked
-files changed, 27 insertions(+), 14 deletions(-)
+      accel/tcg: Pass last not end to tb_invalidate_phys_range
       linux-user: Pass last not end to probe_guest_base
       include/exec: Change reserved_va semantics to last byte
       linux-user/arm: Take more care allocating commpage
  configure                     |   15 +
  meson.build                   |    4 +
  include/exec/cpu-all.h        |   15 +-
  include/exec/exec-all.h       |    2 +-
  include/hw/core/cpu.h         |   39 +-
  include/hw/core/tcg-cpu-ops.h |   43 ++
  include/qemu/qtree.h          |  201 ++++++
  linux-user/arm/target_cpu.h   |    2 +-
  linux-user/user-internals.h   |   12 +-
  accel/tcg/tb-maint.c          |  112 ++--
  accel/tcg/translate-all.c     |    2 +-
  accel/tcg/user-exec.c         |   25 +-
  bsd-user/main.c               |   10 +-
  bsd-user/mmap.c               |   10 +-
  linux-user/elfload.c          |   72 ++-
  linux-user/flatload.c         |    2 +-
  linux-user/main.c             |   31 +-
  linux-user/mmap.c             |   22 +-
  linux-user/syscall.c          |    4 +-
  softmmu/physmem.c             |    2 +-
  softmmu/watchpoint.c          |    5 +
  target/arm/tcg/mte_helper.c   |    1 +
  target/arm/tcg/sve_helper.c   |    1 +
  target/s390x/tcg/mem_helper.c |    1 +
  tcg/region.c                  |   19 +-
  tests/bench/qtree-bench.c     |  286 +++++++++
  tests/unit/test-qtree.c       |  333 ++++++++++
  util/qtree.c                  | 1390 +++++++++++++++++++++++++++++++++++++++++
  softmmu/meson.build           |    2 +-
  tests/bench/meson.build       |    4 +
  tests/unit/meson.build        |    1 +
  util/meson.build              |    1 +
 files changed, 2474 insertions(+), 195 deletions(-)
  create mode 100644 include/qemu/qtree.h
  create mode 100644 tests/bench/qtree-bench.c
  create mode 100644 tests/unit/test-qtree.c
  create mode 100644 util/qtree.c

-New patch
+[PULL 01/15] util: import GTree as QTree
+From: Emilio Cota <cota@braap.org>
+The only reason to add this implementation is to control the memory allocator
+used. Some users (e.g. TCG) cannot work reliably in multi-threaded
+environments (e.g. forking in user-mode) with GTree's allocator, GSlice.
+See https://gitlab.com/qemu-project/qemu/-/issues/285 for details.
+Importing GTree is a temporary workaround until GTree migrates away
+from GSlice.
+This implementation is identical to that in glib v2.75.0, except that
+we don't import recent additions to the API nor deprecated API calls,
+none of which are used in QEMU.
+I've imported tests from glib and added a benchmark just to
+make sure that performance is similar. Note: it cannot be identical
+because (1) we are not using GSlice, (2) we use different compilation flags
+(e.g. -fPIC) and (3) we're linking statically.
+$ cat /proc/cpuinfo| grep 'model name' | head -1
+model name      : AMD Ryzen 7 PRO 5850U with Radeon Graphics
+$ echo '0' | sudo tee /sys/devices/system/cpu/cpufreq/boost
+$ tests/bench/qtree-bench
+ Tree         Op      32            1024            4096          131072         1048576
+------------------------------------------------------------------------------------------------
+GTree     Lookup   83.23           43.08           25.31           19.40           16.22
+QTree     Lookup  113.42 (1.36x)   53.83 (1.25x)   28.38 (1.12x)   17.64 (0.91x)   13.04 (0.80x)
+GTree     Insert   44.23           29.37           25.83           19.49           17.03
+QTree     Insert   46.87 (1.06x)   25.62 (0.87x)   24.29 (0.94x)   16.83 (0.86x)   12.97 (0.76x)
+GTree     Remove   53.27           35.15           31.43           24.64           16.70
+QTree     Remove   57.32 (1.08x)   41.76 (1.19x)   38.37 (1.22x)   29.30 (1.19x)   15.07 (0.90x)
+GTree  RemoveAll  135.44          127.52          126.72          120.11           64.34
+QTree  RemoveAll  127.15 (0.94x)  110.37 (0.87x)  107.97 (0.85x)   97.13 (0.81x)   55.10 (0.86x)
+GTree   Traverse  277.71          276.09          272.78          246.72           98.47
+QTree   Traverse  370.33 (1.33x)  411.97 (1.49x)  400.23 (1.47x)  262.82 (1.07x)   78.52 (0.80x)
+------------------------------------------------------------------------------------------------
+As a sanity check, the same benchmark when Glib's version
+is >= $glib_dropped_gslice_version (i.e. QTree == GTree):
+ Tree         Op      32            1024            4096          131072         1048576
+------------------------------------------------------------------------------------------------
+GTree     Lookup   82.72           43.09           24.18           19.73           16.09
+QTree     Lookup   81.82 (0.99x)   43.10 (1.00x)   24.20 (1.00x)   19.76 (1.00x)   16.26 (1.01x)
+GTree     Insert   45.07           29.62           26.34           19.90           17.18
+QTree     Insert   45.72 (1.01x)   29.60 (1.00x)   26.38 (1.00x)   19.71 (0.99x)   17.20 (1.00x)
+GTree     Remove   54.48           35.36           31.77           24.97           16.95
+QTree     Remove   54.46 (1.00x)   35.32 (1.00x)   31.77 (1.00x)   24.91 (1.00x)   17.15 (1.01x)
+GTree  RemoveAll  140.68          127.36          125.43          121.45           68.20
+QTree  RemoveAll  140.65 (1.00x)  127.64 (1.00x)  125.01 (1.00x)  121.73 (1.00x)   67.06 (0.98x)
+GTree   Traverse  278.68          276.05          266.75          251.65          104.93
+QTree   Traverse  278.31 (1.00x)  275.78 (1.00x)  266.42 (1.00x)  247.89 (0.99x)  104.58 (1.00x)
+------------------------------------------------------------------------------------------------
+Signed-off-by: Emilio Cota <cota@braap.org>
+Message-Id: <20230205163758.416992-2-cota@braap.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ configure                 |   15 +
+ meson.build               |    4 +
+ include/qemu/qtree.h      |  201 ++++++
+ tests/bench/qtree-bench.c |  286 ++++++++
+ tests/unit/test-qtree.c   |  333 +++++++++
+ util/qtree.c              | 1390 +++++++++++++++++++++++++++++++++++++
+ tests/bench/meson.build   |    4 +
+ tests/unit/meson.build    |    1 +
+ util/meson.build          |    1 +
+files changed, 2235 insertions(+)
+ create mode 100644 include/qemu/qtree.h
+ create mode 100644 tests/bench/qtree-bench.c
+ create mode 100644 tests/unit/test-qtree.c
+ create mode 100644 util/qtree.c
+diff --git a/configure b/configure
+index XXXXXXX..XXXXXXX 100755
+--- a/configure
++++ b/configure
+@@ -XXX,XX +XXX,XX @@ safe_stack=""
+ use_containers="yes"
+ gdb_bin=$(command -v "gdb-multiarch" || command -v "gdb")
+ gdb_arches=""
++glib_has_gslice="no"
+ if test -e "$source_path/.git"
+ then
+@@ -XXX,XX +XXX,XX @@ for i in $glib_modules; do
+     fi
+ done
++# Check whether glib has gslice, which we have to avoid for correctness.
++# TODO: remove this check and the corresponding workaround (qtree) when
++# the minimum supported glib is >= $glib_dropped_gslice_version.
++glib_dropped_gslice_version=2.75.3
++for i in $glib_modules; do
++    if ! $pkg_config --atleast-version=$glib_dropped_gslice_version $i; then
++        glib_has_gslice="yes"
++    break
++    fi
++done
++
+ glib_bindir="$($pkg_config --variable=bindir glib-2.0)"
+ if test -z "$glib_bindir" ; then
+     glib_bindir="$($pkg_config --variable=prefix glib-2.0)"/bin
+@@ -XXX,XX +XXX,XX @@ echo "GLIB_CFLAGS=$glib_cflags" >> $config_host_mak
+ echo "GLIB_LIBS=$glib_libs" >> $config_host_mak
+ echo "GLIB_BINDIR=$glib_bindir" >> $config_host_mak
+ echo "GLIB_VERSION=$($pkg_config --modversion glib-2.0)" >> $config_host_mak
++if test "$glib_has_gslice" = "yes" ; then
++    echo "HAVE_GLIB_WITH_SLICE_ALLOCATOR=y" >> $config_host_mak
++fi
+ echo "QEMU_LDFLAGS=$QEMU_LDFLAGS" >> $config_host_mak
+ echo "EXESUF=$EXESUF" >> $config_host_mak
+diff --git a/meson.build b/meson.build
+index XXXXXXX..XXXXXXX 100644
+--- a/meson.build
++++ b/meson.build
+@@ -XXX,XX +XXX,XX @@ glib = declare_dependency(compile_args: config_host['GLIB_CFLAGS'].split(),
+                           })
+ # override glib dep with the configure results (for subprojects)
+ meson.override_dependency('glib-2.0', glib)
++# pass down whether Glib has the slice allocator
++if config_host.has_key('HAVE_GLIB_WITH_SLICE_ALLOCATOR')
++  config_host_data.set('HAVE_GLIB_WITH_SLICE_ALLOCATOR', true)
++endif
+ gio = not_found
+ gdbus_codegen = not_found
+diff --git a/include/qemu/qtree.h b/include/qemu/qtree.h
+new file mode 100644
+index XXXXXXX..XXXXXXX
+--- /dev/null
++++ b/include/qemu/qtree.h
+@@ -XXX,XX +XXX,XX @@
++/*
++ * GLIB - Library of useful routines for C programming
++ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
++ *
++ * SPDX-License-Identifier: LGPL-2.1-or-later
++ *
++ * This library is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU Lesser General Public
++ * License as published by the Free Software Foundation; either
++ * version 2.1 of the License, or (at your option) any later version.
++ *
++ * This library is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ * Lesser General Public License for more details.
++ *
++ * You should have received a copy of the GNU Lesser General Public
++ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
++ */
++
++/*
++ * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
++ * file for a list of people on the GLib Team.  See the ChangeLog
++ * files for a list of changes.  These files are distributed with
++ * GLib at ftp://ftp.gtk.org/pub/gtk/.
++ */
++
++/*
++ * QTree is a partial import of Glib's GTree. The parts excluded correspond
++ * to API calls either deprecated (e.g. g_tree_traverse) or recently added
++ * (e.g. g_tree_search_node, added in 2.68); neither have callers in QEMU.
++ *
++ * The reason for this import is to allow us to control the memory allocator
++ * used by the tree implementation. Until Glib 2.75.3, GTree uses Glib's
++ * slice allocator, which causes problems when forking in user-mode;
++ * see https://gitlab.com/qemu-project/qemu/-/issues/285 and glib's
++ * "45b5a6c1e gslice: Remove slice allocator and use malloc() instead".
++ *
++ * TODO: remove QTree when QEMU's minimum Glib version is >= 2.75.3.
++ */
++
++#ifndef QEMU_QTREE_H
++#define QEMU_QTREE_H
++
++#include "qemu/osdep.h"
++
++#ifdef HAVE_GLIB_WITH_SLICE_ALLOCATOR
++
++typedef struct _QTree  QTree;
++
++typedef struct _QTreeNode QTreeNode;
++
++typedef gboolean (*QTraverseNodeFunc)(QTreeNode *node,
++                                      gpointer user_data);
++
++/*
++ * Balanced binary trees
++ */
++QTree *q_tree_new(GCompareFunc key_compare_func);
++QTree *q_tree_new_with_data(GCompareDataFunc key_compare_func,
++                            gpointer key_compare_data);
++QTree *q_tree_new_full(GCompareDataFunc key_compare_func,
++                       gpointer key_compare_data,
++                       GDestroyNotify key_destroy_func,
++                       GDestroyNotify value_destroy_func);
++QTree *q_tree_ref(QTree *tree);
++void q_tree_unref(QTree *tree);
++void q_tree_destroy(QTree *tree);
++void q_tree_insert(QTree *tree,
++                   gpointer key,
++                   gpointer value);
++void q_tree_replace(QTree *tree,
++                    gpointer key,
++                    gpointer value);
++gboolean q_tree_remove(QTree *tree,
++                       gconstpointer key);
++gboolean q_tree_steal(QTree *tree,
++                      gconstpointer key);
++gpointer q_tree_lookup(QTree *tree,
++                       gconstpointer key);
++gboolean q_tree_lookup_extended(QTree *tree,
++                                gconstpointer lookup_key,
++                                gpointer *orig_key,
++                                gpointer *value);
++void q_tree_foreach(QTree *tree,
++                    GTraverseFunc func,
++                    gpointer user_data);
++gpointer q_tree_search(QTree *tree,
++                       GCompareFunc search_func,
++                       gconstpointer user_data);
++gint q_tree_height(QTree *tree);
++gint q_tree_nnodes(QTree *tree);
++
++#else /* !HAVE_GLIB_WITH_SLICE_ALLOCATOR */
++
++typedef GTree QTree;
++typedef GTreeNode QTreeNode;
++typedef GTraverseNodeFunc QTraverseNodeFunc;
++
++static inline QTree *q_tree_new(GCompareFunc key_compare_func)
++{
++    return g_tree_new(key_compare_func);
++}
++
++static inline QTree *q_tree_new_with_data(GCompareDataFunc key_compare_func,
++                                          gpointer key_compare_data)
++{
++    return g_tree_new_with_data(key_compare_func, key_compare_data);
++}
++
++static inline QTree *q_tree_new_full(GCompareDataFunc key_compare_func,
++                                     gpointer key_compare_data,
++                                     GDestroyNotify key_destroy_func,
++                                     GDestroyNotify value_destroy_func)
++{
++    return g_tree_new_full(key_compare_func, key_compare_data,
++                           key_destroy_func, value_destroy_func);
++}
++
++static inline QTree *q_tree_ref(QTree *tree)
++{
++    return g_tree_ref(tree);
++}
++
++static inline void q_tree_unref(QTree *tree)
++{
++    g_tree_unref(tree);
++}
++
++static inline void q_tree_destroy(QTree *tree)
++{
++    g_tree_destroy(tree);
++}
++
++static inline void q_tree_insert(QTree *tree,
++                                 gpointer key,
++                                 gpointer value)
++{
++    g_tree_insert(tree, key, value);
++}
++
++static inline void q_tree_replace(QTree *tree,
++                                  gpointer key,
++                                  gpointer value)
++{
++    g_tree_replace(tree, key, value);
++}
++
++static inline gboolean q_tree_remove(QTree *tree,
++                                     gconstpointer key)
++{
++    return g_tree_remove(tree, key);
++}
++
++static inline gboolean q_tree_steal(QTree *tree,
++                                    gconstpointer key)
++{
++    return g_tree_steal(tree, key);
++}
++
++static inline gpointer q_tree_lookup(QTree *tree,
++                                     gconstpointer key)
++{
++    return g_tree_lookup(tree, key);
++}
++
++static inline gboolean q_tree_lookup_extended(QTree *tree,
++                                              gconstpointer lookup_key,
++                                              gpointer *orig_key,
++                                              gpointer *value)
++{
++    return g_tree_lookup_extended(tree, lookup_key, orig_key, value);
++}
++
++static inline void q_tree_foreach(QTree *tree,
++                                  GTraverseFunc func,
++                                  gpointer user_data)
++{
++    return g_tree_foreach(tree, func, user_data);
++}
++
++static inline gpointer q_tree_search(QTree *tree,
++                                     GCompareFunc search_func,
++                                     gconstpointer user_data)
++{
++    return g_tree_search(tree, search_func, user_data);
++}
++
++static inline gint q_tree_height(QTree *tree)
++{
++    return g_tree_height(tree);
++}
++
++static inline gint q_tree_nnodes(QTree *tree)
++{
++    return g_tree_nnodes(tree);
++}
++
++#endif /* HAVE_GLIB_WITH_SLICE_ALLOCATOR */
++
++#endif /* QEMU_QTREE_H */
+diff --git a/tests/bench/qtree-bench.c b/tests/bench/qtree-bench.c
+new file mode 100644
+index XXXXXXX..XXXXXXX
+--- /dev/null
++++ b/tests/bench/qtree-bench.c
+@@ -XXX,XX +XXX,XX @@
++/* SPDX-License-Identifier: GPL-2.0-or-later */
++#include "qemu/osdep.h"
++#include "qemu/qtree.h"
++#include "qemu/timer.h"
++
++enum tree_op {
++    OP_LOOKUP,
++    OP_INSERT,
++    OP_REMOVE,
++    OP_REMOVE_ALL,
++    OP_TRAVERSE,
++};
++
++struct benchmark {
++    const char * const name;
++    enum tree_op op;
++    bool fill_on_init;
++};
++
++enum impl_type {
++    IMPL_GTREE,
++    IMPL_QTREE,
++};
++
++struct tree_implementation {
++    const char * const name;
++    enum impl_type type;
++};
++
++static const struct benchmark benchmarks[] = {
++    {
++        .name = "Lookup",
++        .op = OP_LOOKUP,
++        .fill_on_init = true,
++    },
++    {
++        .name = "Insert",
++        .op = OP_INSERT,
++        .fill_on_init = false,
++    },
++    {
++        .name = "Remove",
++        .op = OP_REMOVE,
++        .fill_on_init = true,
++    },
++    {
++        .name = "RemoveAll",
++        .op = OP_REMOVE_ALL,
++        .fill_on_init = true,
++    },
++    {
++        .name = "Traverse",
++        .op = OP_TRAVERSE,
++        .fill_on_init = true,
++    },
++};
++
++static const struct tree_implementation impls[] = {
++    {
++        .name = "GTree",
++        .type = IMPL_GTREE,
++    },
++    {
++        .name = "QTree",
++        .type = IMPL_QTREE,
++    },
++};
++
++static int compare_func(const void *ap, const void *bp)
++{
++    const size_t *a = ap;
++    const size_t *b = bp;
++
++    return *a - *b;
++}
++
++static void init_empty_tree_and_keys(enum impl_type impl,
++                                     void **ret_tree, size_t **ret_keys,
++                                     size_t n_elems)
++{
++    size_t *keys = g_malloc_n(n_elems, sizeof(*keys));
++    for (size_t i = 0; i < n_elems; i++) {
++        keys[i] = i;
++    }
++
++    void *tree;
++    switch (impl) {
++    case IMPL_GTREE:
++        tree = g_tree_new(compare_func);
++        break;
++    case IMPL_QTREE:
++        tree = q_tree_new(compare_func);
++        break;
++    default:
++        g_assert_not_reached();
++    }
++
++    *ret_tree = tree;
++    *ret_keys = keys;
++}
++
++static gboolean traverse_func(gpointer key, gpointer value, gpointer data)
++{
++    return FALSE;
++}
++
++static inline void remove_all(void *tree, enum impl_type impl)
++{
++    switch (impl) {
++    case IMPL_GTREE:
++        g_tree_destroy(tree);
++        break;
++    case IMPL_QTREE:
++        q_tree_destroy(tree);
++        break;
++    default:
++        g_assert_not_reached();
++    }
++}
++
++static int64_t run_benchmark(const struct benchmark *bench,
++                             enum impl_type impl,
++                             size_t n_elems)
++{
++    void *tree;
++    size_t *keys;
++
++    init_empty_tree_and_keys(impl, &tree, &keys, n_elems);
++    if (bench->fill_on_init) {
++        for (size_t i = 0; i < n_elems; i++) {
++            switch (impl) {
++            case IMPL_GTREE:
++                g_tree_insert(tree, &keys[i], &keys[i]);
++                break;
++            case IMPL_QTREE:
++                q_tree_insert(tree, &keys[i], &keys[i]);
++                break;
++            default:
++                g_assert_not_reached();
++            }
++        }
++    }
++
++    int64_t start_ns = get_clock();
++    switch (bench->op) {
++    case OP_LOOKUP:
++        for (size_t i = 0; i < n_elems; i++) {
++            void *value;
++            switch (impl) {
++            case IMPL_GTREE:
++                value = g_tree_lookup(tree, &keys[i]);
++                break;
++            case IMPL_QTREE:
++                value = q_tree_lookup(tree, &keys[i]);
++                break;
++            default:
++                g_assert_not_reached();
++            }
++            (void)value;
++        }
++        break;
++    case OP_INSERT:
++        for (size_t i = 0; i < n_elems; i++) {
++            switch (impl) {
++            case IMPL_GTREE:
++                g_tree_insert(tree, &keys[i], &keys[i]);
++                break;
++            case IMPL_QTREE:
++                q_tree_insert(tree, &keys[i], &keys[i]);
++                break;
++            default:
++                g_assert_not_reached();
++            }
++        }
++        break;
++    case OP_REMOVE:
++        for (size_t i = 0; i < n_elems; i++) {
++            switch (impl) {
++            case IMPL_GTREE:
++                g_tree_remove(tree, &keys[i]);
++                break;
++            case IMPL_QTREE:
++                q_tree_remove(tree, &keys[i]);
++                break;
++            default:
++                g_assert_not_reached();
++            }
++        }
++        break;
++    case OP_REMOVE_ALL:
++        remove_all(tree, impl);
++        break;
++    case OP_TRAVERSE:
++        switch (impl) {
++        case IMPL_GTREE:
++            g_tree_foreach(tree, traverse_func, NULL);
++            break;
++        case IMPL_QTREE:
++            q_tree_foreach(tree, traverse_func, NULL);
++            break;
++        default:
++            g_assert_not_reached();
++        }
++        break;
++    default:
++        g_assert_not_reached();
++    }
++    int64_t ns = get_clock() - start_ns;
++
++    if (bench->op != OP_REMOVE_ALL) {
++        remove_all(tree, impl);
++    }
++    g_free(keys);
++
++    return ns;
++}
++
++int main(int argc, char *argv[])
++{
++    size_t sizes[] = {
++        32,
++        1024,
++        1024 * 4,
++        1024 * 128,
++        1024 * 1024,
++    };
++
++    double res[ARRAY_SIZE(benchmarks)][ARRAY_SIZE(impls)][ARRAY_SIZE(sizes)];
++    for (int i = 0; i < ARRAY_SIZE(sizes); i++) {
++        size_t size = sizes[i];
++        for (int j = 0; j < ARRAY_SIZE(impls); j++) {
++            const struct tree_implementation *impl = &impls[j];
++            for (int k = 0; k < ARRAY_SIZE(benchmarks); k++) {
++                const struct benchmark *bench = &benchmarks[k];
++
++                /* warm-up run */
++                run_benchmark(bench, impl->type, size);
++
++                int64_t total_ns = 0;
++                int64_t n_runs = 0;
++                while (total_ns < 2e8 || n_runs < 5) {
++                    total_ns += run_benchmark(bench, impl->type, size);
++                    n_runs++;
++                }
++                double ns_per_run = (double)total_ns / n_runs;
++
++                /* Throughput, in Mops/s */
++                res[k][j][i] = size / ns_per_run * 1e3;
++            }
++        }
++    }
++
++    printf("# Results' breakdown: Tree, Op and #Elements. Units: Mops/s\n");
++    printf("%5s %10s ", "Tree", "Op");
++    for (int i = 0; i < ARRAY_SIZE(sizes); i++) {
++        printf("%7zu         ", sizes[i]);
++    }
++    printf("\n");
++    char separator[97];
++    for (int i = 0; i < ARRAY_SIZE(separator) - 1; i++) {
++        separator[i] = '-';
++    }
++    separator[ARRAY_SIZE(separator) - 1] = '\0';
++    printf("%s\n", separator);
++    for (int i = 0; i < ARRAY_SIZE(benchmarks); i++) {
++        for (int j = 0; j < ARRAY_SIZE(impls); j++) {
++            printf("%5s %10s ", impls[j].name, benchmarks[i].name);
++            for (int k = 0; k < ARRAY_SIZE(sizes); k++) {
++                printf("%7.2f ", res[i][j][k]);
++                if (j == 0) {
++                    printf("        ");
++                } else {
++                    if (res[i][0][k] != 0) {
++                        double speedup = res[i][j][k] / res[i][0][k];
++                        printf("(%4.2fx) ", speedup);
++                    } else {
++                        printf("(     ) ");
++                    }
++                }
++            }
++            printf("\n");
++        }
++    }
++    printf("%s\n", separator);
++    return 0;
++}
+diff --git a/tests/unit/test-qtree.c b/tests/unit/test-qtree.c
+new file mode 100644
+index XXXXXXX..XXXXXXX
+--- /dev/null
++++ b/tests/unit/test-qtree.c
+@@ -XXX,XX +XXX,XX @@
++/*
++ * SPDX-License-Identifier: LGPL-2.1-or-later
++ *
++ * Tests for QTree.
++ * Original source: glib
++ *   https://gitlab.gnome.org/GNOME/glib/-/blob/main/glib/tests/tree.c
++ *   LGPL license.
++ *   Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
++ */
++
++#include "qemu/osdep.h"
++#include "qemu/qtree.h"
++
++static gint my_compare(gconstpointer a, gconstpointer b)
++{
++    const char *cha = a;
++    const char *chb = b;
++
++    return *cha - *chb;
++}
++
++static gint my_compare_with_data(gconstpointer a,
++                                 gconstpointer b,
++                                 gpointer user_data)
++{
++    const char *cha = a;
++    const char *chb = b;
++
++    /* just check that we got the right data */
++    g_assert(GPOINTER_TO_INT(user_data) == 123);
++
++    return *cha - *chb;
++}
++
++static gint my_search(gconstpointer a, gconstpointer b)
++{
++    return my_compare(b, a);
++}
++
++static gpointer destroyed_key;
++static gpointer destroyed_value;
++static guint destroyed_key_count;
++static guint destroyed_value_count;
++
++static void my_key_destroy(gpointer key)
++{
++    destroyed_key = key;
++    destroyed_key_count++;
++}
++
++static void my_value_destroy(gpointer value)
++{
++    destroyed_value = value;
++    destroyed_value_count++;
++}
++
++static gint my_traverse(gpointer key, gpointer value, gpointer data)
++{
++    char *ch = key;
++
++    g_assert((*ch) > 0);
++
++    if (*ch == 'd') {
++        return TRUE;
++    }
++
++    return FALSE;
++}
++
++char chars[] =
++    "0123456789"
++    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
++    "abcdefghijklmnopqrstuvwxyz";
++
++char chars2[] =
++    "0123456789"
++    "abcdefghijklmnopqrstuvwxyz";
++
++static gint check_order(gpointer key, gpointer value, gpointer data)
++{
++    char **p = data;
++    char *ch = key;
++
++    g_assert(**p == *ch);
++
++    (*p)++;
++
++    return FALSE;
++}
++
++static void test_tree_search(void)
++{
++    gint i;
++    QTree *tree;
++    gboolean removed;
++    gchar c;
++    gchar *p, *d;
++
++    tree = q_tree_new_with_data(my_compare_with_data, GINT_TO_POINTER(123));
++
++    for (i = 0; chars[i]; i++) {
++        q_tree_insert(tree, &chars[i], &chars[i]);
++    }
++
++    q_tree_foreach(tree, my_traverse, NULL);
++
++    g_assert(q_tree_nnodes(tree) == strlen(chars));
++    g_assert(q_tree_height(tree) == 6);
++
++    p = chars;
++    q_tree_foreach(tree, check_order, &p);
++
++    for (i = 0; i < 26; i++) {
++        removed = q_tree_remove(tree, &chars[i + 10]);
++        g_assert(removed);
++    }
++
++    c = '\0';
++    removed = q_tree_remove(tree, &c);
++    g_assert(!removed);
++
++    q_tree_foreach(tree, my_traverse, NULL);
++
++    g_assert(q_tree_nnodes(tree) == strlen(chars2));
++    g_assert(q_tree_height(tree) == 6);
++
++    p = chars2;
++    q_tree_foreach(tree, check_order, &p);
++
++    for (i = 25; i >= 0; i--) {
++        q_tree_insert(tree, &chars[i + 10], &chars[i + 10]);
++    }
++
++    p = chars;
++    q_tree_foreach(tree, check_order, &p);
++
++    c = '0';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p && *p == c);
++    g_assert(q_tree_lookup_extended(tree, &c, (gpointer *)&d, (gpointer *)&p));
++    g_assert(c == *d && c == *p);
++
++    c = 'A';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p && *p == c);
++
++    c = 'a';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p && *p == c);
++
++    c = 'z';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p && *p == c);
++
++    c = '!';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p == NULL);
++
++    c = '=';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p == NULL);
++
++    c = '|';
++    p = q_tree_lookup(tree, &c);
++    g_assert(p == NULL);
++
++    c = '0';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p && *p == c);
++
++    c = 'A';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p && *p == c);
++
++    c = 'a';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p && *p == c);
++
++    c = 'z';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p && *p == c);
++
++    c = '!';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p == NULL);
++
++    c = '=';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p == NULL);
++
++    c = '|';
++    p = q_tree_search(tree, my_search, &c);
++    g_assert(p == NULL);
++
++    q_tree_destroy(tree);
++}
++
++static void test_tree_remove(void)
++{
++    QTree *tree;
++    char c, d;
++    gint i;
++    gboolean removed;
++
++    tree = q_tree_new_full((GCompareDataFunc)my_compare, NULL,
++                           my_key_destroy,
++                           my_value_destroy);
++
++    for (i = 0; chars[i]; i++) {
++        q_tree_insert(tree, &chars[i], &chars[i]);
++    }
++
++    c = '0';
++    q_tree_insert(tree, &c, &c);
++    g_assert(destroyed_key == &c);
++    g_assert(destroyed_value == &chars[0]);
++    destroyed_key = NULL;
++    destroyed_value = NULL;
++
++    d = '1';
++    q_tree_replace(tree, &d, &d);
++    g_assert(destroyed_key == &chars[1]);
++    g_assert(destroyed_value == &chars[1]);
++    destroyed_key = NULL;
++    destroyed_value = NULL;
++
++    c = '2';
++    removed = q_tree_remove(tree, &c);
++    g_assert(removed);
++    g_assert(destroyed_key == &chars[2]);
++    g_assert(destroyed_value == &chars[2]);
++    destroyed_key = NULL;
++    destroyed_value = NULL;
++
++    c = '3';
++    removed = q_tree_steal(tree, &c);
++    g_assert(removed);
++    g_assert(destroyed_key == NULL);
++    g_assert(destroyed_value == NULL);
++
++    const gchar *remove = "omkjigfedba";
++    for (i = 0; remove[i]; i++) {
++        removed = q_tree_remove(tree, &remove[i]);
++        g_assert(removed);
++    }
++
++    q_tree_destroy(tree);
++}
++
++static void test_tree_destroy(void)
++{
++    QTree *tree;
++    gint i;
++
++    tree = q_tree_new(my_compare);
++
++    for (i = 0; chars[i]; i++) {
++        q_tree_insert(tree, &chars[i], &chars[i]);
++    }
++
++    g_assert(q_tree_nnodes(tree) == strlen(chars));
++
++    g_test_message("nnodes: %d", q_tree_nnodes(tree));
++    q_tree_ref(tree);
++    q_tree_destroy(tree);
++
++    g_test_message("nnodes: %d", q_tree_nnodes(tree));
++    g_assert(q_tree_nnodes(tree) == 0);
++
++    q_tree_unref(tree);
++}
++
++static void test_tree_insert(void)
++{
++    QTree *tree;
++    gchar *p;
++    gint i;
++    gchar *scrambled;
++
++    tree = q_tree_new(my_compare);
++
++    for (i = 0; chars[i]; i++) {
++        q_tree_insert(tree, &chars[i], &chars[i]);
++    }
++    p = chars;
++    q_tree_foreach(tree, check_order, &p);
++
++    q_tree_unref(tree);
++    tree = q_tree_new(my_compare);
++
++    for (i = strlen(chars) - 1; i >= 0; i--) {
++        q_tree_insert(tree, &chars[i], &chars[i]);
++    }
++    p = chars;
++    q_tree_foreach(tree, check_order, &p);
++
++    q_tree_unref(tree);
++    tree = q_tree_new(my_compare);
++
++    scrambled = g_strdup(chars);
++
++    for (i = 0; i < 30; i++) {
++        gchar tmp;
++        gint a, b;
++
++        a = g_random_int_range(0, strlen(scrambled));
++        b = g_random_int_range(0, strlen(scrambled));
++        tmp = scrambled[a];
++        scrambled[a] = scrambled[b];
++        scrambled[b] = tmp;
++    }
++
++    for (i = 0; scrambled[i]; i++) {
++        q_tree_insert(tree, &scrambled[i], &scrambled[i]);
++    }
++    p = chars;
++    q_tree_foreach(tree, check_order, &p);
++
++    g_free(scrambled);
++    q_tree_unref(tree);
++}
++
++int main(int argc, char *argv[])
++{
++    g_test_init(&argc, &argv, NULL);
++
++    g_test_add_func("/qtree/search", test_tree_search);
++    g_test_add_func("/qtree/remove", test_tree_remove);
++    g_test_add_func("/qtree/destroy", test_tree_destroy);
++    g_test_add_func("/qtree/insert", test_tree_insert);
++
++    return g_test_run();
++}
+diff --git a/util/qtree.c b/util/qtree.c
+new file mode 100644
+index XXXXXXX..XXXXXXX
+--- /dev/null
++++ b/util/qtree.c
+@@ -XXX,XX +XXX,XX @@
++/*
++ * GLIB - Library of useful routines for C programming
++ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
++ *
++ * SPDX-License-Identifier: LGPL-2.1-or-later
++ *
++ * This library is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU Lesser General Public
++ * License as published by the Free Software Foundation; either
++ * version 2.1 of the License, or (at your option) any later version.
++ *
++ * This library is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
++ * Lesser General Public License for more details.
++ *
++ * You should have received a copy of the GNU Lesser General Public
++ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
++ */
++
++/*
++ * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
++ * file for a list of people on the GLib Team.  See the ChangeLog
++ * files for a list of changes.  These files are distributed with
++ * GLib at ftp://ftp.gtk.org/pub/gtk/.
++ */
++
++/*
++ * MT safe
++ */
++
++#include "qemu/osdep.h"
++#include "qemu/qtree.h"
++
++/**
++ * SECTION:trees-binary
++ * @title: Balanced Binary Trees
++ * @short_description: a sorted collection of key/value pairs optimized
++ *                     for searching and traversing in order
++ *
++ * The #QTree structure and its associated functions provide a sorted
++ * collection of key/value pairs optimized for searching and traversing
++ * in order. This means that most of the operations  (access, search,
++ * insertion, deletion, ...) on #QTree are O(log(n)) in average and O(n)
++ * in worst case for time complexity. But, note that maintaining a
++ * balanced sorted #QTree of n elements is done in time O(n log(n)).
++ *
++ * To create a new #QTree use q_tree_new().
++ *
++ * To insert a key/value pair into a #QTree use q_tree_insert()
++ * (O(n log(n))).
++ *
++ * To remove a key/value pair use q_tree_remove() (O(n log(n))).
++ *
++ * To look up the value corresponding to a given key, use
++ * q_tree_lookup() and q_tree_lookup_extended().
++ *
++ * To find out the number of nodes in a #QTree, use q_tree_nnodes(). To
++ * get the height of a #QTree, use q_tree_height().
++ *
++ * To traverse a #QTree, calling a function for each node visited in
++ * the traversal, use q_tree_foreach().
++ *
++ * To destroy a #QTree, use q_tree_destroy().
++ **/
++
++#define MAX_GTREE_HEIGHT 40
++
++/**
++ * QTree:
++ *
++ * The QTree struct is an opaque data structure representing a
++ * [balanced binary tree][glib-Balanced-Binary-Trees]. It should be
++ * accessed only by using the following functions.
++ */
++struct _QTree {
++    QTreeNode        *root;
++    GCompareDataFunc  key_compare;
++    GDestroyNotify    key_destroy_func;
++    GDestroyNotify    value_destroy_func;
++    gpointer          key_compare_data;
++    guint             nnodes;
++    gint              ref_count;
++};
++
++struct _QTreeNode {
++    gpointer   key;         /* key for this node */
++    gpointer   value;       /* value stored at this node */
++    QTreeNode *left;        /* left subtree */
++    QTreeNode *right;       /* right subtree */
++    gint8      balance;     /* height (right) - height (left) */
++    guint8     left_child;
++    guint8     right_child;
++};
++
++
++static QTreeNode *q_tree_node_new(gpointer       key,
++                                  gpointer       value);
++static QTreeNode *q_tree_insert_internal(QTree *tree,
++                                         gpointer key,
++                                         gpointer value,
++                                         gboolean replace);
++static gboolean   q_tree_remove_internal(QTree         *tree,
++                                         gconstpointer  key,
++                                         gboolean       steal);
++static QTreeNode *q_tree_node_balance(QTreeNode     *node);
++static QTreeNode *q_tree_find_node(QTree         *tree,
++                                   gconstpointer  key);
++static QTreeNode *q_tree_node_search(QTreeNode *node,
++                                     GCompareFunc search_func,
++                                     gconstpointer data);
++static QTreeNode *q_tree_node_rotate_left(QTreeNode     *node);
++static QTreeNode *q_tree_node_rotate_right(QTreeNode     *node);
++#ifdef Q_TREE_DEBUG
++static void       q_tree_node_check(QTreeNode     *node);
++#endif
++
++static QTreeNode*
++q_tree_node_new(gpointer key,
++                gpointer value)
++{
++    QTreeNode *node = g_new(QTreeNode, 1);
++
++    node->balance = 0;
++    node->left = NULL;
++    node->right = NULL;
++    node->left_child = FALSE;
++    node->right_child = FALSE;
++    node->key = key;
++    node->value = value;
++
++    return node;
++}
++
++/**
++ * q_tree_new:
++ * @key_compare_func: the function used to order the nodes in the #QTree.
++ *   It should return values similar to the standard strcmp() function -
++ *   0 if the two arguments are equal, a negative value if the first argument
++ *   comes before the second, or a positive value if the first argument comes
++ *   after the second.
++ *
++ * Creates a new #QTree.
++ *
++ * Returns: a newly allocated #QTree
++ */
++QTree *
++q_tree_new(GCompareFunc key_compare_func)
++{
++    g_return_val_if_fail(key_compare_func != NULL, NULL);
++
++    return q_tree_new_full((GCompareDataFunc) key_compare_func, NULL,
++                           NULL, NULL);
++}
++
++/**
++ * q_tree_new_with_data:
++ * @key_compare_func: qsort()-style comparison function
++ * @key_compare_data: data to pass to comparison function
++ *
++ * Creates a new #QTree with a comparison function that accepts user data.
++ * See q_tree_new() for more details.
++ *
++ * Returns: a newly allocated #QTree
++ */
++QTree *
++q_tree_new_with_data(GCompareDataFunc key_compare_func,
++                     gpointer         key_compare_data)
++{
++    g_return_val_if_fail(key_compare_func != NULL, NULL);
++
++    return q_tree_new_full(key_compare_func, key_compare_data,
++                           NULL, NULL);
++}
++
++/**
++ * q_tree_new_full:
++ * @key_compare_func: qsort()-style comparison function
++ * @key_compare_data: data to pass to comparison function
++ * @key_destroy_func: a function to free the memory allocated for the key
++ *   used when removing the entry from the #QTree or %NULL if you don't
++ *   want to supply such a function
++ * @value_destroy_func: a function to free the memory allocated for the
++ *   value used when removing the entry from the #QTree or %NULL if you
++ *   don't want to supply such a function
++ *
++ * Creates a new #QTree like q_tree_new() and allows to specify functions
++ * to free the memory allocated for the key and value that get called when
++ * removing the entry from the #QTree.
++ *
++ * Returns: a newly allocated #QTree
++ */
++QTree *
++q_tree_new_full(GCompareDataFunc key_compare_func,
++                gpointer         key_compare_data,
++                GDestroyNotify   key_destroy_func,
++                GDestroyNotify   value_destroy_func)
++{
++    QTree *tree;
++
++    g_return_val_if_fail(key_compare_func != NULL, NULL);
++
++    tree = g_new(QTree, 1);
++    tree->root               = NULL;
++    tree->key_compare        = key_compare_func;
++    tree->key_destroy_func   = key_destroy_func;
++    tree->value_destroy_func = value_destroy_func;
++    tree->key_compare_data   = key_compare_data;
++    tree->nnodes             = 0;
++    tree->ref_count          = 1;
++
++    return tree;
++}
++
++/**
++ * q_tree_node_first:
++ * @tree: a #QTree
++ *
++ * Returns the first in-order node of the tree, or %NULL
++ * for an empty tree.
++ *
++ * Returns: (nullable) (transfer none): the first node in the tree
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_node_first(QTree *tree)
++{
++    QTreeNode *tmp;
++
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    if (!tree->root) {
++        return NULL;
++    }
++
++    tmp = tree->root;
++
++    while (tmp->left_child) {
++        tmp = tmp->left;
++    }
++
++    return tmp;
++}
++
++/**
++ * q_tree_node_previous
++ * @node: a #QTree node
++ *
++ * Returns the previous in-order node of the tree, or %NULL
++ * if the passed node was already the first one.
++ *
++ * Returns: (nullable) (transfer none): the previous node in the tree
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_node_previous(QTreeNode *node)
++{
++    QTreeNode *tmp;
++
++    g_return_val_if_fail(node != NULL, NULL);
++
++    tmp = node->left;
++
++    if (node->left_child) {
++        while (tmp->right_child) {
++            tmp = tmp->right;
++        }
++    }
++
++    return tmp;
++}
++
++/**
++ * q_tree_node_next
++ * @node: a #QTree node
++ *
++ * Returns the next in-order node of the tree, or %NULL
++ * if the passed node was already the last one.
++ *
++ * Returns: (nullable) (transfer none): the next node in the tree
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_node_next(QTreeNode *node)
++{
++    QTreeNode *tmp;
++
++    g_return_val_if_fail(node != NULL, NULL);
++
++    tmp = node->right;
++
++    if (node->right_child) {
++        while (tmp->left_child) {
++            tmp = tmp->left;
++        }
++    }
++
++    return tmp;
++}
++
++/**
++ * q_tree_remove_all:
++ * @tree: a #QTree
++ *
++ * Removes all nodes from a #QTree and destroys their keys and values,
++ * then resets the #QTree’s root to %NULL.
++ *
++ * Since: 2.70 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static void
++q_tree_remove_all(QTree *tree)
++{
++    QTreeNode *node;
++    QTreeNode *next;
++
++    g_return_if_fail(tree != NULL);
++
++    node = q_tree_node_first(tree);
++
++    while (node) {
++        next = q_tree_node_next(node);
++
++        if (tree->key_destroy_func) {
++            tree->key_destroy_func(node->key);
++        }
++        if (tree->value_destroy_func) {
++            tree->value_destroy_func(node->value);
++        }
++        g_free(node);
++
++#ifdef Q_TREE_DEBUG
++        g_assert(tree->nnodes > 0);
++        tree->nnodes--;
++#endif
++
++        node = next;
++    }
++
++#ifdef Q_TREE_DEBUG
++    g_assert(tree->nnodes == 0);
++#endif
++
++    tree->root = NULL;
++#ifndef Q_TREE_DEBUG
++    tree->nnodes = 0;
++#endif
++}
++
++/**
++ * q_tree_ref:
++ * @tree: a #QTree
++ *
++ * Increments the reference count of @tree by one.
++ *
++ * It is safe to call this function from any thread.
++ *
++ * Returns: the passed in #QTree
++ *
++ * Since: 2.22
++ */
++QTree *
++q_tree_ref(QTree *tree)
++{
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    g_atomic_int_inc(&tree->ref_count);
++
++    return tree;
++}
++
++/**
++ * q_tree_unref:
++ * @tree: a #QTree
++ *
++ * Decrements the reference count of @tree by one.
++ * If the reference count drops to 0, all keys and values will
++ * be destroyed (if destroy functions were specified) and all
++ * memory allocated by @tree will be released.
++ *
++ * It is safe to call this function from any thread.
++ *
++ * Since: 2.22
++ */
++void
++q_tree_unref(QTree *tree)
++{
++    g_return_if_fail(tree != NULL);
++
++    if (g_atomic_int_dec_and_test(&tree->ref_count)) {
++        q_tree_remove_all(tree);
++        g_free(tree);
++    }
++}
++
++/**
++ * q_tree_destroy:
++ * @tree: a #QTree
++ *
++ * Removes all keys and values from the #QTree and decreases its
++ * reference count by one. If keys and/or values are dynamically
++ * allocated, you should either free them first or create the #QTree
++ * using q_tree_new_full(). In the latter case the destroy functions
++ * you supplied will be called on all keys and values before destroying
++ * the #QTree.
++ */
++void
++q_tree_destroy(QTree *tree)
++{
++    g_return_if_fail(tree != NULL);
++
++    q_tree_remove_all(tree);
++    q_tree_unref(tree);
++}
++
++/**
++ * q_tree_insert_node:
++ * @tree: a #QTree
++ * @key: the key to insert
++ * @value: the value corresponding to the key
++ *
++ * Inserts a key/value pair into a #QTree.
++ *
++ * If the given key already exists in the #QTree its corresponding value
++ * is set to the new value. If you supplied a @value_destroy_func when
++ * creating the #QTree, the old value is freed using that function. If
++ * you supplied a @key_destroy_func when creating the #QTree, the passed
++ * key is freed using that function.
++ *
++ * The tree is automatically 'balanced' as new key/value pairs are added,
++ * so that the distance from the root to every leaf is as small as possible.
++ * The cost of maintaining a balanced tree while inserting new key/value
++ * result in a O(n log(n)) operation where most of the other operations
++ * are O(log(n)).
++ *
++ * Returns: (transfer none): the inserted (or set) node.
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_insert_node(QTree    *tree,
++                   gpointer  key,
++                   gpointer  value)
++{
++    QTreeNode *node;
++
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    node = q_tree_insert_internal(tree, key, value, FALSE);
++
++#ifdef Q_TREE_DEBUG
++    q_tree_node_check(tree->root);
++#endif
++
++    return node;
++}
++
++/**
++ * q_tree_insert:
++ * @tree: a #QTree
++ * @key: the key to insert
++ * @value: the value corresponding to the key
++ *
++ * Inserts a key/value pair into a #QTree.
++ *
++ * Inserts a new key and value into a #QTree as q_tree_insert_node() does,
++ * only this function does not return the inserted or set node.
++ */
++void
++q_tree_insert(QTree    *tree,
++              gpointer  key,
++              gpointer  value)
++{
++    q_tree_insert_node(tree, key, value);
++}
++
++/**
++ * q_tree_replace_node:
++ * @tree: a #QTree
++ * @key: the key to insert
++ * @value: the value corresponding to the key
++ *
++ * Inserts a new key and value into a #QTree similar to q_tree_insert_node().
++ * The difference is that if the key already exists in the #QTree, it gets
++ * replaced by the new key. If you supplied a @value_destroy_func when
++ * creating the #QTree, the old value is freed using that function. If you
++ * supplied a @key_destroy_func when creating the #QTree, the old key is
++ * freed using that function.
++ *
++ * The tree is automatically 'balanced' as new key/value pairs are added,
++ * so that the distance from the root to every leaf is as small as possible.
++ *
++ * Returns: (transfer none): the inserted (or set) node.
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_replace_node(QTree    *tree,
++                    gpointer  key,
++                    gpointer  value)
++{
++    QTreeNode *node;
++
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    node = q_tree_insert_internal(tree, key, value, TRUE);
++
++#ifdef Q_TREE_DEBUG
++    q_tree_node_check(tree->root);
++#endif
++
++    return node;
++}
++
++/**
++ * q_tree_replace:
++ * @tree: a #QTree
++ * @key: the key to insert
++ * @value: the value corresponding to the key
++ *
++ * Inserts a new key and value into a #QTree as q_tree_replace_node() does,
++ * only this function does not return the inserted or set node.
++ */
++void
++q_tree_replace(QTree    *tree,
++               gpointer  key,
++               gpointer  value)
++{
++    q_tree_replace_node(tree, key, value);
++}
++
++/* internal insert routine */
++static QTreeNode *
++q_tree_insert_internal(QTree    *tree,
++                       gpointer  key,
++                       gpointer  value,
++                       gboolean  replace)
++{
++    QTreeNode *node, *retnode;
++    QTreeNode *path[MAX_GTREE_HEIGHT];
++    int idx;
++
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    if (!tree->root) {
++        tree->root = q_tree_node_new(key, value);
++        tree->nnodes++;
++        return tree->root;
++    }
++
++    idx = 0;
++    path[idx++] = NULL;
++    node = tree->root;
++
++    while (1) {
++        int cmp = tree->key_compare(key, node->key, tree->key_compare_data);
++
++        if (cmp == 0) {
++            if (tree->value_destroy_func) {
++                tree->value_destroy_func(node->value);
++            }
++
++            node->value = value;
++
++            if (replace) {
++                if (tree->key_destroy_func) {
++                    tree->key_destroy_func(node->key);
++                }
++
++                node->key = key;
++            } else {
++                /* free the passed key */
++                if (tree->key_destroy_func) {
++                    tree->key_destroy_func(key);
++                }
++            }
++
++            return node;
++        } else if (cmp < 0) {
++            if (node->left_child) {
++                path[idx++] = node;
++                node = node->left;
++            } else {
++                QTreeNode *child = q_tree_node_new(key, value);
++
++                child->left = node->left;
++                child->right = node;
++                node->left = child;
++                node->left_child = TRUE;
++                node->balance -= 1;
++
++                tree->nnodes++;
++
++                retnode = child;
++                break;
++            }
++        } else {
++            if (node->right_child) {
++                path[idx++] = node;
++                node = node->right;
++            } else {
++                QTreeNode *child = q_tree_node_new(key, value);
++
++                child->right = node->right;
++                child->left = node;
++                node->right = child;
++                node->right_child = TRUE;
++                node->balance += 1;
++
++                tree->nnodes++;
++
++                retnode = child;
++                break;
++            }
++        }
++    }
++
++    /*
++     * Restore balance. This is the goodness of a non-recursive
++     * implementation, when we are done with balancing we 'break'
++     * the loop and we are done.
++     */
++    while (1) {
++        QTreeNode *bparent = path[--idx];
++        gboolean left_node = (bparent && node == bparent->left);
++        g_assert(!bparent || bparent->left == node || bparent->right == node);
++
++        if (node->balance < -1 || node->balance > 1) {
++            node = q_tree_node_balance(node);
++            if (bparent == NULL) {
++                tree->root = node;
++            } else if (left_node) {
++                bparent->left = node;
++            } else {
++                bparent->right = node;
++            }
++        }
++
++        if (node->balance == 0 || bparent == NULL) {
++            break;
++        }
++
++        if (left_node) {
++            bparent->balance -= 1;
++        } else {
++            bparent->balance += 1;
++        }
++
++        node = bparent;
++    }
++
++    return retnode;
++}
++
++/**
++ * q_tree_remove:
++ * @tree: a #QTree
++ * @key: the key to remove
++ *
++ * Removes a key/value pair from a #QTree.
++ *
++ * If the #QTree was created using q_tree_new_full(), the key and value
++ * are freed using the supplied destroy functions, otherwise you have to
++ * make sure that any dynamically allocated values are freed yourself.
++ * If the key does not exist in the #QTree, the function does nothing.
++ *
++ * The cost of maintaining a balanced tree while removing a key/value
++ * result in a O(n log(n)) operation where most of the other operations
++ * are O(log(n)).
++ *
++ * Returns: %TRUE if the key was found (prior to 2.8, this function
++ *     returned nothing)
++ */
++gboolean
++q_tree_remove(QTree         *tree,
++              gconstpointer  key)
++{
++    gboolean removed;
++
++    g_return_val_if_fail(tree != NULL, FALSE);
++
++    removed = q_tree_remove_internal(tree, key, FALSE);
++
++#ifdef Q_TREE_DEBUG
++    q_tree_node_check(tree->root);
++#endif
++
++    return removed;
++}
++
++/**
++ * q_tree_steal:
++ * @tree: a #QTree
++ * @key: the key to remove
++ *
++ * Removes a key and its associated value from a #QTree without calling
++ * the key and value destroy functions.
++ *
++ * If the key does not exist in the #QTree, the function does nothing.
++ *
++ * Returns: %TRUE if the key was found (prior to 2.8, this function
++ *     returned nothing)
++ */
++gboolean
++q_tree_steal(QTree         *tree,
++             gconstpointer  key)
++{
++    gboolean removed;
++
++    g_return_val_if_fail(tree != NULL, FALSE);
++
++    removed = q_tree_remove_internal(tree, key, TRUE);
++
++#ifdef Q_TREE_DEBUG
++    q_tree_node_check(tree->root);
++#endif
++
++    return removed;
++}
++
++/* internal remove routine */
++static gboolean
++q_tree_remove_internal(QTree         *tree,
++                       gconstpointer  key,
++                       gboolean       steal)
++{
++    QTreeNode *node, *parent, *balance;
++    QTreeNode *path[MAX_GTREE_HEIGHT];
++    int idx;
++    gboolean left_node;
++
++    g_return_val_if_fail(tree != NULL, FALSE);
++
++    if (!tree->root) {
++        return FALSE;
++    }
++
++    idx = 0;
++    path[idx++] = NULL;
++    node = tree->root;
++
++    while (1) {
++        int cmp = tree->key_compare(key, node->key, tree->key_compare_data);
++
++        if (cmp == 0) {
++            break;
++        } else if (cmp < 0) {
++            if (!node->left_child) {
++                return FALSE;
++            }
++
++            path[idx++] = node;
++            node = node->left;
++        } else {
++            if (!node->right_child) {
++                return FALSE;
++            }
++
++            path[idx++] = node;
++            node = node->right;
++        }
++    }
++
++    /*
++     * The following code is almost equal to q_tree_remove_node,
++     * except that we do not have to call q_tree_node_parent.
++     */
++    balance = parent = path[--idx];
++    g_assert(!parent || parent->left == node || parent->right == node);
++    left_node = (parent && node == parent->left);
++
++    if (!node->left_child) {
++        if (!node->right_child) {
++            if (!parent) {
++                tree->root = NULL;
++            } else if (left_node) {
++                parent->left_child = FALSE;
++                parent->left = node->left;
++                parent->balance += 1;
++            } else {
++                parent->right_child = FALSE;
++                parent->right = node->right;
++                parent->balance -= 1;
++            }
++        } else {
++            /* node has a right child */
++            QTreeNode *tmp = q_tree_node_next(node);
++            tmp->left = node->left;
++
++            if (!parent) {
++                tree->root = node->right;
++            } else if (left_node) {
++                parent->left = node->right;
++                parent->balance += 1;
++            } else {
++                parent->right = node->right;
++                parent->balance -= 1;
++            }
++        }
++    } else {
++        /* node has a left child */
++        if (!node->right_child) {
++            QTreeNode *tmp = q_tree_node_previous(node);
++            tmp->right = node->right;
++
++            if (parent == NULL) {
++                tree->root = node->left;
++            } else if (left_node) {
++                parent->left = node->left;
++                parent->balance += 1;
++            } else {
++                parent->right = node->left;
++                parent->balance -= 1;
++            }
++        } else {
++            /* node has a both children (pant, pant!) */
++            QTreeNode *prev = node->left;
++            QTreeNode *next = node->right;
++            QTreeNode *nextp = node;
++            int old_idx = idx + 1;
++            idx++;
++
++            /* path[idx] == parent */
++            /* find the immediately next node (and its parent) */
++            while (next->left_child) {
++                path[++idx] = nextp = next;
++                next = next->left;
++            }
++
++            path[old_idx] = next;
++            balance = path[idx];
++
++            /* remove 'next' from the tree */
++            if (nextp != node) {
++                if (next->right_child) {
++                    nextp->left = next->right;
++                } else {
++                    nextp->left_child = FALSE;
++                }
++                nextp->balance += 1;
++
++                next->right_child = TRUE;
++                next->right = node->right;
++            } else {
++                node->balance -= 1;
++            }
++
++            /* set the prev to point to the right place */
++            while (prev->right_child) {
++                prev = prev->right;
++            }
++            prev->right = next;
++
++            /* prepare 'next' to replace 'node' */
++            next->left_child = TRUE;
++            next->left = node->left;
++            next->balance = node->balance;
++
++            if (!parent) {
++                tree->root = next;
++            } else if (left_node) {
++                parent->left = next;
++            } else {
++                parent->right = next;
++            }
++        }
++    }
++
++    /* restore balance */
++    if (balance) {
++        while (1) {
++            QTreeNode *bparent = path[--idx];
++            g_assert(!bparent ||
++                     bparent->left == balance ||
++                     bparent->right == balance);
++            left_node = (bparent && balance == bparent->left);
++
++            if (balance->balance < -1 || balance->balance > 1) {
++                balance = q_tree_node_balance(balance);
++                if (!bparent) {
++                    tree->root = balance;
++                } else if (left_node) {
++                    bparent->left = balance;
++                } else {
++                    bparent->right = balance;
++                }
++            }
++
++            if (balance->balance != 0 || !bparent) {
++                break;
++            }
++
++            if (left_node) {
++                bparent->balance += 1;
++            } else {
++                bparent->balance -= 1;
++            }
++
++            balance = bparent;
++        }
++    }
++
++    if (!steal) {
++        if (tree->key_destroy_func) {
++            tree->key_destroy_func(node->key);
++        }
++        if (tree->value_destroy_func) {
++            tree->value_destroy_func(node->value);
++        }
++    }
++
++    g_free(node);
++
++    tree->nnodes--;
++
++    return TRUE;
++}
++
++/**
++ * q_tree_lookup_node:
++ * @tree: a #QTree
++ * @key: the key to look up
++ *
++ * Gets the tree node corresponding to the given key. Since a #QTree is
++ * automatically balanced as key/value pairs are added, key lookup
++ * is O(log n) (where n is the number of key/value pairs in the tree).
++ *
++ * Returns: (nullable) (transfer none): the tree node corresponding to
++ *          the key, or %NULL if the key was not found
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_lookup_node(QTree         *tree,
++                   gconstpointer  key)
++{
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    return q_tree_find_node(tree, key);
++}
++
++/**
++ * q_tree_lookup:
++ * @tree: a #QTree
++ * @key: the key to look up
++ *
++ * Gets the value corresponding to the given key. Since a #QTree is
++ * automatically balanced as key/value pairs are added, key lookup
++ * is O(log n) (where n is the number of key/value pairs in the tree).
++ *
++ * Returns: the value corresponding to the key, or %NULL
++ *     if the key was not found
++ */
++gpointer
++q_tree_lookup(QTree         *tree,
++              gconstpointer  key)
++{
++    QTreeNode *node;
++
++    node = q_tree_lookup_node(tree, key);
++
++    return node ? node->value : NULL;
++}
++
++/**
++ * q_tree_lookup_extended:
++ * @tree: a #QTree
++ * @lookup_key: the key to look up
++ * @orig_key: (out) (optional) (nullable): returns the original key
++ * @value: (out) (optional) (nullable): returns the value associated with
++ *         the key
++ *
++ * Looks up a key in the #QTree, returning the original key and the
++ * associated value. This is useful if you need to free the memory
++ * allocated for the original key, for example before calling
++ * q_tree_remove().
++ *
++ * Returns: %TRUE if the key was found in the #QTree
++ */
++gboolean
++q_tree_lookup_extended(QTree         *tree,
++                       gconstpointer  lookup_key,
++                       gpointer      *orig_key,
++                       gpointer      *value)
++{
++    QTreeNode *node;
++
++    g_return_val_if_fail(tree != NULL, FALSE);
++
++    node = q_tree_find_node(tree, lookup_key);
++
++    if (node) {
++        if (orig_key) {
++            *orig_key = node->key;
++        }
++        if (value) {
++            *value = node->value;
++        }
++        return TRUE;
++    } else {
++        return FALSE;
++    }
++}
++
++/**
++ * q_tree_foreach:
++ * @tree: a #QTree
++ * @func: the function to call for each node visited.
++ *     If this function returns %TRUE, the traversal is stopped.
++ * @user_data: user data to pass to the function
++ *
++ * Calls the given function for each of the key/value pairs in the #QTree.
++ * The function is passed the key and value of each pair, and the given
++ * @data parameter. The tree is traversed in sorted order.
++ *
++ * The tree may not be modified while iterating over it (you can't
++ * add/remove items). To remove all items matching a predicate, you need
++ * to add each item to a list in your #GTraverseFunc as you walk over
++ * the tree, then walk the list and remove each item.
++ */
++void
++q_tree_foreach(QTree         *tree,
++               GTraverseFunc  func,
++               gpointer       user_data)
++{
++    QTreeNode *node;
++
++    g_return_if_fail(tree != NULL);
++
++    if (!tree->root) {
++        return;
++    }
++
++    node = q_tree_node_first(tree);
++
++    while (node) {
++        if ((*func)(node->key, node->value, user_data)) {
++            break;
++        }
++
++        node = q_tree_node_next(node);
++    }
++}
++
++/**
++ * q_tree_search_node:
++ * @tree: a #QTree
++ * @search_func: a function used to search the #QTree
++ * @user_data: the data passed as the second argument to @search_func
++ *
++ * Searches a #QTree using @search_func.
++ *
++ * The @search_func is called with a pointer to the key of a key/value
++ * pair in the tree, and the passed in @user_data. If @search_func returns
++ * 0 for a key/value pair, then the corresponding node is returned as
++ * the result of q_tree_search(). If @search_func returns -1, searching
++ * will proceed among the key/value pairs that have a smaller key; if
++ * @search_func returns 1, searching will proceed among the key/value
++ * pairs that have a larger key.
++ *
++ * Returns: (nullable) (transfer none): the node corresponding to the
++ *          found key, or %NULL if the key was not found
++ *
++ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
++ */
++static QTreeNode *
++q_tree_search_node(QTree         *tree,
++                   GCompareFunc   search_func,
++                   gconstpointer  user_data)
++{
++    g_return_val_if_fail(tree != NULL, NULL);
++
++    if (!tree->root) {
++        return NULL;
++    }
++
++    return q_tree_node_search(tree->root, search_func, user_data);
++}
++
++/**
++ * q_tree_search:
++ * @tree: a #QTree
++ * @search_func: a function used to search the #QTree
++ * @user_data: the data passed as the second argument to @search_func
++ *
++ * Searches a #QTree using @search_func.
++ *
++ * The @search_func is called with a pointer to the key of a key/value
++ * pair in the tree, and the passed in @user_data. If @search_func returns
++ * 0 for a key/value pair, then the corresponding value is returned as
++ * the result of q_tree_search(). If @search_func returns -1, searching
++ * will proceed among the key/value pairs that have a smaller key; if
++ * @search_func returns 1, searching will proceed among the key/value
++ * pairs that have a larger key.
++ *
++ * Returns: the value corresponding to the found key, or %NULL
++ *     if the key was not found
++ */
++gpointer
++q_tree_search(QTree         *tree,
++              GCompareFunc   search_func,
++              gconstpointer  user_data)
++{
++    QTreeNode *node;
++
++    node = q_tree_search_node(tree, search_func, user_data);
++
++    return node ? node->value : NULL;
++}
++
++/**
++ * q_tree_height:
++ * @tree: a #QTree
++ *
++ * Gets the height of a #QTree.
++ *
++ * If the #QTree contains no nodes, the height is 0.
++ * If the #QTree contains only one root node the height is 1.
++ * If the root node has children the height is 2, etc.
++ *
++ * Returns: the height of @tree
++ */
++gint
++q_tree_height(QTree *tree)
++{
++    QTreeNode *node;
++    gint height;
++
++    g_return_val_if_fail(tree != NULL, 0);
++
++    if (!tree->root) {
++        return 0;
++    }
++
++    height = 0;
++    node = tree->root;
++
++    while (1) {
++        height += 1 + MAX(node->balance, 0);
++
++        if (!node->left_child) {
++            return height;
++        }
++
++        node = node->left;
++    }
++}
++
++/**
++ * q_tree_nnodes:
++ * @tree: a #QTree
++ *
++ * Gets the number of nodes in a #QTree.
++ *
++ * Returns: the number of nodes in @tree
++ */
++gint
++q_tree_nnodes(QTree *tree)
++{
++    g_return_val_if_fail(tree != NULL, 0);
++
++    return tree->nnodes;
++}
++
++static QTreeNode *
++q_tree_node_balance(QTreeNode *node)
++{
++    if (node->balance < -1) {
++        if (node->left->balance > 0) {
++            node->left = q_tree_node_rotate_left(node->left);
++        }
++        node = q_tree_node_rotate_right(node);
++    } else if (node->balance > 1) {
++        if (node->right->balance < 0) {
++            node->right = q_tree_node_rotate_right(node->right);
++        }
++        node = q_tree_node_rotate_left(node);
++    }
++
++    return node;
++}
++
++static QTreeNode *
++q_tree_find_node(QTree        *tree,
++                 gconstpointer key)
++{
++    QTreeNode *node;
++    gint cmp;
++
++    node = tree->root;
++    if (!node) {
++        return NULL;
++    }
++
++    while (1) {
++        cmp = tree->key_compare(key, node->key, tree->key_compare_data);
++        if (cmp == 0) {
++            return node;
++        } else if (cmp < 0) {
++            if (!node->left_child) {
++                return NULL;
++            }
++
++            node = node->left;
++        } else {
++            if (!node->right_child) {
++                return NULL;
++            }
++
++            node = node->right;
++        }
++    }
++}
++
++static QTreeNode *
++q_tree_node_search(QTreeNode     *node,
++                   GCompareFunc   search_func,
++                   gconstpointer  data)
++{
++    gint dir;
++
++    if (!node) {
++        return NULL;
++    }
++
++    while (1) {
++        dir = (*search_func)(node->key, data);
++        if (dir == 0) {
++            return node;
++        } else if (dir < 0) {
++            if (!node->left_child) {
++                return NULL;
++            }
++
++            node = node->left;
++        } else {
++            if (!node->right_child) {
++                return NULL;
++            }
++
++            node = node->right;
++        }
++    }
++}
++
++static QTreeNode *
++q_tree_node_rotate_left(QTreeNode *node)
++{
++    QTreeNode *right;
++    gint a_bal;
++    gint b_bal;
++
++    right = node->right;
++
++    if (right->left_child) {
++        node->right = right->left;
++    } else {
++        node->right_child = FALSE;
++        right->left_child = TRUE;
++    }
++    right->left = node;
++
++    a_bal = node->balance;
++    b_bal = right->balance;
++
++    if (b_bal <= 0) {
++        if (a_bal >= 1) {
++            right->balance = b_bal - 1;
++        } else {
++            right->balance = a_bal + b_bal - 2;
++        }
++        node->balance = a_bal - 1;
++    } else {
++        if (a_bal <= b_bal) {
++            right->balance = a_bal - 2;
++        } else {
++            right->balance = b_bal - 1;
++        }
++        node->balance = a_bal - b_bal - 1;
++    }
++
++    return right;
++}
++
++static QTreeNode *
++q_tree_node_rotate_right(QTreeNode *node)
++{
++    QTreeNode *left;
++    gint a_bal;
++    gint b_bal;
++
++    left = node->left;
++
++    if (left->right_child) {
++        node->left = left->right;
++    } else {
++        node->left_child = FALSE;
++        left->right_child = TRUE;
++    }
++    left->right = node;
++
++    a_bal = node->balance;
++    b_bal = left->balance;
++
++    if (b_bal <= 0) {
++        if (b_bal > a_bal) {
++            left->balance = b_bal + 1;
++        } else {
++            left->balance = a_bal + 2;
++        }
++        node->balance = a_bal - b_bal + 1;
++    } else {
++        if (a_bal <= -1) {
++            left->balance = b_bal + 1;
++        } else {
++            left->balance = a_bal + b_bal + 2;
++        }
++        node->balance = a_bal + 1;
++    }
++
++    return left;
++}
++
++#ifdef Q_TREE_DEBUG
++static gint
++q_tree_node_height(QTreeNode *node)
++{
++    gint left_height;
++    gint right_height;
++
++    if (node) {
++        left_height = 0;
++        right_height = 0;
++
++        if (node->left_child) {
++            left_height = q_tree_node_height(node->left);
++        }
++
++        if (node->right_child) {
++            right_height = q_tree_node_height(node->right);
++        }
++
++        return MAX(left_height, right_height) + 1;
++    }
++
++    return 0;
++}
++
++static void q_tree_node_check(QTreeNode *node)
++{
++    gint left_height;
++    gint right_height;
++    gint balance;
++    QTreeNode *tmp;
++
++    if (node) {
++        if (node->left_child) {
++            tmp = q_tree_node_previous(node);
++            g_assert(tmp->right == node);
++        }
++
++        if (node->right_child) {
++            tmp = q_tree_node_next(node);
++            g_assert(tmp->left == node);
++        }
++
++        left_height = 0;
++        right_height = 0;
++
++        if (node->left_child) {
++            left_height = q_tree_node_height(node->left);
++        }
++        if (node->right_child) {
++            right_height = q_tree_node_height(node->right);
++        }
++
++        balance = right_height - left_height;
++        g_assert(balance == node->balance);
++
++        if (node->left_child) {
++            q_tree_node_check(node->left);
++        }
++        if (node->right_child) {
++            q_tree_node_check(node->right);
++        }
++    }
++}
++#endif
+diff --git a/tests/bench/meson.build b/tests/bench/meson.build
+index XXXXXXX..XXXXXXX 100644
+--- a/tests/bench/meson.build
++++ b/tests/bench/meson.build
+@@ -XXX,XX +XXX,XX @@ xbzrle_bench = executable('xbzrle-bench',
+                        dependencies: [qemuutil,migration])
+ endif
++qtree_bench = executable('qtree-bench',
++                         sources: 'qtree-bench.c',
++                         dependencies: [qemuutil])
++
+ executable('atomic_add-bench',
+            sources: files('atomic_add-bench.c'),
+            dependencies: [qemuutil],
+diff --git a/tests/unit/meson.build b/tests/unit/meson.build
+index XXXXXXX..XXXXXXX 100644
+--- a/tests/unit/meson.build
++++ b/tests/unit/meson.build
+@@ -XXX,XX +XXX,XX @@ tests = {
+   'test-rcu-slist': [],
+   'test-qdist': [],
+   'test-qht': [],
++  'test-qtree': [],
+   'test-bitops': [],
+   'test-bitcnt': [],
+   'test-qgraph': ['../qtest/libqos/qgraph.c'],
+diff --git a/util/meson.build b/util/meson.build
+index XXXXXXX..XXXXXXX 100644
+--- a/util/meson.build
++++ b/util/meson.build
+@@ -XXX,XX +XXX,XX @@ util_ss.add(when: 'CONFIG_WIN32', if_true: files('oslib-win32.c'))
+ util_ss.add(when: 'CONFIG_WIN32', if_true: files('qemu-thread-win32.c'))
+ util_ss.add(when: 'CONFIG_WIN32', if_true: winmm)
+ util_ss.add(when: 'CONFIG_WIN32', if_true: pathcch)
++util_ss.add(when: 'HAVE_GLIB_WITH_SLICE_ALLOCATOR', if_true: files('qtree.c'))
+ util_ss.add(files('envlist.c', 'path.c', 'module.c'))
+ util_ss.add(files('host-utils.c'))
+ util_ss.add(files('bitmap.c', 'bitops.c'))
+--
+.34.1

-New patch
+[PULL 02/15] tcg: use QTree instead of GTree
+From: Emilio Cota <cota@braap.org>
 qemu-user can hang in a multi-threaded fork. One common
 reason is that when creating a TB, between fork and exec
 we manipulate a GTree whose memory allocator (GSlice) is
 not fork-safe.
 Although POSIX does not mandate it, the system's allocator
 (e.g. tcmalloc, libc malloc) is probably fork-safe.
 Fix some of these hangs by using QTree, which uses the system's
 allocator regardless of the Glib version that we used at
 configuration time.
 Tested with the test program in the original bug report, i.e.:
 ```
 void garble() {
   int pid = fork();
   if (pid == 0) {
     exit(0);
   } else {
     int wstatus;
     waitpid(pid, &wstatus, 0);
   }
 }
 void supragarble(unsigned depth) {
   if (depth == 0)
     return ;
   std::thread a(supragarble, depth-1);
   std::thread b(supragarble, depth-1);
   garble();
   a.join();
   b.join();
 }
 int main() {
   supragarble(10);
 }
 ```
 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/285
 Reported-by: Valentin David <me@valentindavid.com>
 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
 Signed-off-by: Emilio Cota <cota@braap.org>
 Message-Id: <20230205163758.416992-3-cota@braap.org>
 [rth: Add QEMU_DISABLE_CFI for all callback using functions.]
 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 ---
  accel/tcg/tb-maint.c | 17 +++++++++--------
  tcg/region.c         | 19 ++++++++++---------
  util/qtree.c         |  8 ++++----
 files changed, 23 insertions(+), 21 deletions(-)
 diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
 index XXXXXXX..XXXXXXX 100644
 --- a/accel/tcg/tb-maint.c
 +++ b/accel/tcg/tb-maint.c
@@ -XXX,XX +XXX,XX @@
  #include "qemu/osdep.h"
  #include "qemu/interval-tree.h"
 +#include "qemu/qtree.h"
  #include "exec/cputlb.h"
  #include "exec/log.h"
  #include "exec/exec-all.h"
@@ -XXX,XX +XXX,XX @@ struct page_entry {
   * See also: page_collection_lock().
   */
  struct page_collection {
 -    GTree *tree;
 +    QTree *tree;
      struct page_entry *max;
  };
@@ -XXX,XX +XXX,XX @@ static bool page_trylock_add(struct page_collection *set, tb_page_addr_t addr)
      struct page_entry *pe;
      PageDesc *pd;
 -    pe = g_tree_lookup(set->tree, &index);
 +    pe = q_tree_lookup(set->tree, &index);
      if (pe) {
          return false;
      }
@@ -XXX,XX +XXX,XX @@ static bool page_trylock_add(struct page_collection *set, tb_page_addr_t addr)
      }
      pe = page_entry_new(pd, index);
 -    g_tree_insert(set->tree, &pe->index, pe);
 +    q_tree_insert(set->tree, &pe->index, pe);
      /*
       * If this is either (1) the first insertion or (2) a page whose index
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
      end   >>= TARGET_PAGE_BITS;
      g_assert(start <= end);
 -    set->tree = g_tree_new_full(tb_page_addr_cmp, NULL, NULL,
 +    set->tree = q_tree_new_full(tb_page_addr_cmp, NULL, NULL,
                                  page_entry_destroy);
      set->max = NULL;
      assert_no_pages_locked();
   retry:
 -    g_tree_foreach(set->tree, page_entry_lock, NULL);
 +    q_tree_foreach(set->tree, page_entry_lock, NULL);
      for (index = start; index <= end; index++) {
          TranslationBlock *tb;
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
              continue;
          }
          if (page_trylock_add(set, index << TARGET_PAGE_BITS)) {
 -            g_tree_foreach(set->tree, page_entry_unlock, NULL);
 +            q_tree_foreach(set->tree, page_entry_unlock, NULL);
              goto retry;
          }
          assert_page_locked(pd);
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
                  (tb_page_addr1(tb) != -1 &&
                   page_trylock_add(set, tb_page_addr1(tb)))) {
                  /* drop all locks, and reacquire in order */
 -                g_tree_foreach(set->tree, page_entry_unlock, NULL);
 +                q_tree_foreach(set->tree, page_entry_unlock, NULL);
                  goto retry;
              }
          }
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
  static void page_collection_unlock(struct page_collection *set)
  {
      /* entries are unlocked and freed via page_entry_destroy */
 -    g_tree_destroy(set->tree);
 +    q_tree_destroy(set->tree);
      g_free(set);
  }
 diff --git a/tcg/region.c b/tcg/region.c
 index XXXXXXX..XXXXXXX 100644
 --- a/tcg/region.c
 +++ b/tcg/region.c
@@ -XXX,XX +XXX,XX @@
  #include "qemu/mprotect.h"
  #include "qemu/memalign.h"
  #include "qemu/cacheinfo.h"
 +#include "qemu/qtree.h"
  #include "qapi/error.h"
  #include "exec/exec-all.h"
  #include "tcg/tcg.h"
@@ -XXX,XX +XXX,XX @@
  struct tcg_region_tree {
      QemuMutex lock;
 -    GTree *tree;
 +    QTree *tree;
      /* padding to avoid false sharing is computed at run-time */
  };
@@ -XXX,XX +XXX,XX @@ static void tcg_region_trees_init(void)
          struct tcg_region_tree *rt = region_trees + i * tree_size;
          qemu_mutex_init(&rt->lock);
 -        rt->tree = g_tree_new_full(tb_tc_cmp, NULL, NULL, tb_destroy);
 +        rt->tree = q_tree_new_full(tb_tc_cmp, NULL, NULL, tb_destroy);
      }
  }
@@ -XXX,XX +XXX,XX @@ void tcg_tb_insert(TranslationBlock *tb)
      g_assert(rt != NULL);
      qemu_mutex_lock(&rt->lock);
 -    g_tree_insert(rt->tree, &tb->tc, tb);
 +    q_tree_insert(rt->tree, &tb->tc, tb);
      qemu_mutex_unlock(&rt->lock);
  }
@@ -XXX,XX +XXX,XX @@ void tcg_tb_remove(TranslationBlock *tb)
      g_assert(rt != NULL);
      qemu_mutex_lock(&rt->lock);
 -    g_tree_remove(rt->tree, &tb->tc);
 +    q_tree_remove(rt->tree, &tb->tc);
      qemu_mutex_unlock(&rt->lock);
  }
@@ -XXX,XX +XXX,XX @@ TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr)
      }
      qemu_mutex_lock(&rt->lock);
 -    tb = g_tree_lookup(rt->tree, &s);
 +    tb = q_tree_lookup(rt->tree, &s);
      qemu_mutex_unlock(&rt->lock);
      return tb;
  }
@@ -XXX,XX +XXX,XX @@ void tcg_tb_foreach(GTraverseFunc func, gpointer user_data)
      for (i = 0; i < region.n; i++) {
          struct tcg_region_tree *rt = region_trees + i * tree_size;
 -        g_tree_foreach(rt->tree, func, user_data);
 +        q_tree_foreach(rt->tree, func, user_data);
      }
      tcg_region_tree_unlock_all();
  }
@@ -XXX,XX +XXX,XX @@ size_t tcg_nb_tbs(void)
      for (i = 0; i < region.n; i++) {
          struct tcg_region_tree *rt = region_trees + i * tree_size;
 -        nb_tbs += g_tree_nnodes(rt->tree);
 +        nb_tbs += q_tree_nnodes(rt->tree);
      }
      tcg_region_tree_unlock_all();
      return nb_tbs;
@@ -XXX,XX +XXX,XX @@ static void tcg_region_tree_reset_all(void)
          struct tcg_region_tree *rt = region_trees + i * tree_size;
          /* Increment the refcount first so that destroy acts as a reset */
 -        g_tree_ref(rt->tree);
 -        g_tree_destroy(rt->tree);
 +        q_tree_ref(rt->tree);
 +        q_tree_destroy(rt->tree);
      }
      tcg_region_tree_unlock_all();
  }
 diff --git a/util/qtree.c b/util/qtree.c
 index XXXXXXX..XXXXXXX 100644
 --- a/util/qtree.c
 +++ b/util/qtree.c
@@ -XXX,XX +XXX,XX @@ q_tree_node_next(QTreeNode *node)
   *
   * Since: 2.70 in GLib. Internal in Qtree, i.e. not in the public API.
   */
 -static void
 +static void QEMU_DISABLE_CFI
  q_tree_remove_all(QTree *tree)
  {
      QTreeNode *node;
@@ -XXX,XX +XXX,XX @@ q_tree_replace(QTree    *tree,
  }
  /* internal insert routine */
 -static QTreeNode *
 +static QTreeNode * QEMU_DISABLE_CFI
  q_tree_insert_internal(QTree    *tree,
                         gpointer  key,
                         gpointer  value,
@@ -XXX,XX +XXX,XX @@ q_tree_steal(QTree         *tree,
  }
  /* internal remove routine */
 -static gboolean
 +static gboolean QEMU_DISABLE_CFI
  q_tree_remove_internal(QTree         *tree,
                         gconstpointer  key,
                         gboolean       steal)
@@ -XXX,XX +XXX,XX @@ q_tree_node_balance(QTreeNode *node)
      return node;
  }
 -static QTreeNode *
 +static QTreeNode * QEMU_DISABLE_CFI
  q_tree_find_node(QTree        *tree,
                   gconstpointer key)
  {
 --
 .34.1

-New patch
+[PULL 03/15] linux-user: Diagnose misaligned -R size
+We have been enforcing host page alignment for the non-R
+fallback of MAX_RESERVED_VA, but failing to enforce for -R.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ linux-user/main.c | 6 ++++++
+file changed, 6 insertions(+)
+diff --git a/linux-user/main.c b/linux-user/main.c
+index XXXXXXX..XXXXXXX 100644
+--- a/linux-user/main.c
++++ b/linux-user/main.c
+@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv, char **envp)
+      */
+     max_reserved_va = MAX_RESERVED_VA(cpu);
+     if (reserved_va != 0) {
++        if (reserved_va % qemu_host_page_size) {
++            char *s = size_to_str(qemu_host_page_size);
++            fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
++            g_free(s);
++            exit(EXIT_FAILURE);
++        }
+         if (max_reserved_va && reserved_va > max_reserved_va) {
+             fprintf(stderr, "Reserved virtual address too big\n");
+             exit(EXIT_FAILURE);
+--
+.34.1

-New patch
+[PULL 04/15] accel/tcg: Pass last not end to page_set_flags
+Pass the address of the last byte to be changed, rather than
 the first address past the last byte.  This avoids overflow
 when the last page of the address space is involved.
 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1528
 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 ---
  include/exec/cpu-all.h |  2 +-
  accel/tcg/user-exec.c  | 16 +++++++---------
  bsd-user/mmap.c        |  6 +++---
  linux-user/elfload.c   | 11 ++++++-----
  linux-user/mmap.c      | 16 ++++++++--------
  linux-user/syscall.c   |  4 ++--
 files changed, 27 insertions(+), 28 deletions(-)
 diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
 index XXXXXXX..XXXXXXX 100644
 --- a/include/exec/cpu-all.h
 +++ b/include/exec/cpu-all.h
@@ -XXX,XX +XXX,XX @@ typedef int (*walk_memory_regions_fn)(void *, target_ulong,
  int walk_memory_regions(void *, walk_memory_regions_fn);
  int page_get_flags(target_ulong address);
 -void page_set_flags(target_ulong start, target_ulong end, int flags);
 +void page_set_flags(target_ulong start, target_ulong last, int flags);
  void page_reset_target_data(target_ulong start, target_ulong end);
  int page_check_range(target_ulong start, target_ulong len, int flags);
 diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
 index XXXXXXX..XXXXXXX 100644
 --- a/accel/tcg/user-exec.c
 +++ b/accel/tcg/user-exec.c
@@ -XXX,XX +XXX,XX @@ static bool pageflags_set_clear(target_ulong start, target_ulong last,
   * The flag PAGE_WRITE_ORG is positioned automatically depending
   * on PAGE_WRITE.  The mmap_lock should already be held.
   */
 -void page_set_flags(target_ulong start, target_ulong end, int flags)
 +void page_set_flags(target_ulong start, target_ulong last, int flags)
  {
 -    target_ulong last;
      bool reset = false;
      bool inval_tb = false;
      /* This function should never be called with addresses outside the
         guest address space.  If this assert fires, it probably indicates
         a missing call to h2g_valid.  */
 -    assert(start < end);
 -    assert(end - 1 <= GUEST_ADDR_MAX);
 +    assert(start <= last);
 +    assert(last <= GUEST_ADDR_MAX);
      /* Only set PAGE_ANON with new mappings. */
      assert(!(flags & PAGE_ANON) || (flags & PAGE_RESET));
      assert_memory_lock();
 -    start = start & TARGET_PAGE_MASK;
 -    end = TARGET_PAGE_ALIGN(end);
 -    last = end - 1;
 +    start &= TARGET_PAGE_MASK;
 +    last |= ~TARGET_PAGE_MASK;
      if (!(flags & PAGE_VALID)) {
          flags = 0;
@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
      }
      if (!flags || reset) {
 -        page_reset_target_data(start, end);
 +        page_reset_target_data(start, last + 1);
          inval_tb |= pageflags_unset(start, last);
      }
      if (flags) {
@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
                                          ~(reset ? 0 : PAGE_STICKY));
      }
      if (inval_tb) {
 -        tb_invalidate_phys_range(start, end);
 +        tb_invalidate_phys_range(start, last + 1);
      }
  }
 diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
 index XXXXXXX..XXXXXXX 100644
 --- a/bsd-user/mmap.c
 +++ b/bsd-user/mmap.c
@@ -XXX,XX +XXX,XX @@ int target_mprotect(abi_ulong start, abi_ulong len, int prot)
          if (ret != 0)
              goto error;
      }
 -    page_set_flags(start, start + len, prot | PAGE_VALID);
 +    page_set_flags(start, start + len - 1, prot | PAGE_VALID);
      mmap_unlock();
      return 0;
  error:
@@ -XXX,XX +XXX,XX @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
          }
      }
   the_end1:
 -    page_set_flags(start, start + len, prot | PAGE_VALID);
 +    page_set_flags(start, start + len - 1, prot | PAGE_VALID);
   the_end:
  #ifdef DEBUG_MMAP
      printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
@@ -XXX,XX +XXX,XX @@ int target_munmap(abi_ulong start, abi_ulong len)
      }
      if (ret == 0) {
 -        page_set_flags(start, start + len, 0);
 +        page_set_flags(start, start + len - 1, 0);
      }
      mmap_unlock();
      return ret;
 diff --git a/linux-user/elfload.c b/linux-user/elfload.c
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/elfload.c
 +++ b/linux-user/elfload.c
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
          exit(EXIT_FAILURE);
      }
      page_set_flags(TARGET_VSYSCALL_PAGE,
 -                   TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE,
 +                   TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK,
                     PAGE_EXEC | PAGE_VALID);
      return true;
  }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
          exit(EXIT_FAILURE);
      }
 -    page_set_flags(commpage, commpage + qemu_host_page_size,
 +    page_set_flags(commpage, commpage | ~qemu_host_page_mask,
                     PAGE_READ | PAGE_EXEC | PAGE_VALID);
      return true;
  }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
          exit(EXIT_FAILURE);
      }
 -    page_set_flags(LO_COMMPAGE, LO_COMMPAGE + TARGET_PAGE_SIZE,
 +    page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
                     PAGE_READ | PAGE_EXEC | PAGE_VALID);
      return true;
  }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
       * and implement syscalls.  Here, simply mark the page executable.
       * Special case the entry points during translation (see do_page_zero).
       */
 -    page_set_flags(LO_COMMPAGE, LO_COMMPAGE + TARGET_PAGE_SIZE,
 +    page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
                     PAGE_EXEC | PAGE_VALID);
      return true;
  }
@@ -XXX,XX +XXX,XX @@ static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot)
      /* Ensure that the bss page(s) are valid */
      if ((page_get_flags(last_bss-1) & prot) != prot) {
 -        page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss, prot | PAGE_VALID);
 +        page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss - 1,
 +                       prot | PAGE_VALID);
      }
      if (host_start < host_map_start) {
 diff --git a/linux-user/mmap.c b/linux-user/mmap.c
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/mmap.c
 +++ b/linux-user/mmap.c
@@ -XXX,XX +XXX,XX @@ int target_mprotect(abi_ulong start, abi_ulong len, int target_prot)
          }
      }
 -    page_set_flags(start, start + len, page_flags);
 +    page_set_flags(start, start + len - 1, page_flags);
      ret = 0;
  error:
@@ -XXX,XX +XXX,XX @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
      }
      page_flags |= PAGE_RESET;
      if (passthrough_start == passthrough_end) {
 -        page_set_flags(start, start + len, page_flags);
 +        page_set_flags(start, start + len - 1, page_flags);
      } else {
          if (start < passthrough_start) {
 -            page_set_flags(start, passthrough_start, page_flags);
 +            page_set_flags(start, passthrough_start - 1, page_flags);
          }
 -        page_set_flags(passthrough_start, passthrough_end,
 +        page_set_flags(passthrough_start, passthrough_end - 1,
                         page_flags | PAGE_PASSTHROUGH);
          if (passthrough_end < start + len) {
 -            page_set_flags(passthrough_end, start + len, page_flags);
 +            page_set_flags(passthrough_end, start + len - 1, page_flags);
          }
      }
   the_end:
@@ -XXX,XX +XXX,XX @@ int target_munmap(abi_ulong start, abi_ulong len)
      }
      if (ret == 0) {
 -        page_set_flags(start, start + len, 0);
 +        page_set_flags(start, start + len - 1, 0);
      }
      mmap_unlock();
      return ret;
@@ -XXX,XX +XXX,XX @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
      } else {
          new_addr = h2g(host_addr);
          prot = page_get_flags(old_addr);
 -        page_set_flags(old_addr, old_addr + old_size, 0);
 -        page_set_flags(new_addr, new_addr + new_size,
 +        page_set_flags(old_addr, old_addr + old_size - 1, 0);
 +        page_set_flags(new_addr, new_addr + new_size - 1,
                         prot | PAGE_VALID | PAGE_RESET);
      }
      mmap_unlock();
 diff --git a/linux-user/syscall.c b/linux-user/syscall.c
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/syscall.c
 +++ b/linux-user/syscall.c
@@ -XXX,XX +XXX,XX @@ static inline abi_ulong do_shmat(CPUArchState *cpu_env,
      }
      raddr=h2g((unsigned long)host_raddr);
 -    page_set_flags(raddr, raddr + shm_info.shm_segsz,
 +    page_set_flags(raddr, raddr + shm_info.shm_segsz - 1,
                     PAGE_VALID | PAGE_RESET | PAGE_READ |
                     (shmflg & SHM_RDONLY ? 0 : PAGE_WRITE));
@@ -XXX,XX +XXX,XX @@ static inline abi_long do_shmdt(abi_ulong shmaddr)
      for (i = 0; i < N_SHM_REGIONS; ++i) {
          if (shm_regions[i].in_use && shm_regions[i].start == shmaddr) {
              shm_regions[i].in_use = false;
 -            page_set_flags(shmaddr, shmaddr + shm_regions[i].size, 0);
 +            page_set_flags(shmaddr, shmaddr + shm_regions[i].size - 1, 0);
              break;
          }
      }
 --
 .34.1

-New patch
+[PULL 05/15] accel/tcg: Pass last not end to page_reset_target_data
+Pass the address of the last byte to be changed, rather than
+the first address past the last byte.  This avoids overflow
+when the last page of the address space is involved.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ include/exec/cpu-all.h |  2 +-
+ accel/tcg/user-exec.c  | 11 +++++------
+ linux-user/mmap.c      |  2 +-
+files changed, 7 insertions(+), 8 deletions(-)
+diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
+index XXXXXXX..XXXXXXX 100644
+--- a/include/exec/cpu-all.h
++++ b/include/exec/cpu-all.h
+@@ -XXX,XX +XXX,XX @@ int walk_memory_regions(void *, walk_memory_regions_fn);
+ int page_get_flags(target_ulong address);
+ void page_set_flags(target_ulong start, target_ulong last, int flags);
+-void page_reset_target_data(target_ulong start, target_ulong end);
++void page_reset_target_data(target_ulong start, target_ulong last);
+ int page_check_range(target_ulong start, target_ulong len, int flags);
+ /**
+diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/user-exec.c
++++ b/accel/tcg/user-exec.c
+@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong last, int flags)
+     }
+     if (!flags || reset) {
+-        page_reset_target_data(start, last + 1);
++        page_reset_target_data(start, last);
+         inval_tb |= pageflags_unset(start, last);
+     }
+     if (flags) {
+@@ -XXX,XX +XXX,XX @@ typedef struct TargetPageDataNode {
+ static IntervalTreeRoot targetdata_root;
+-void page_reset_target_data(target_ulong start, target_ulong end)
++void page_reset_target_data(target_ulong start, target_ulong last)
+ {
+     IntervalTreeNode *n, *next;
+-    target_ulong last;
+     assert_memory_lock();
+-    start = start & TARGET_PAGE_MASK;
+-    last = TARGET_PAGE_ALIGN(end) - 1;
++    start &= TARGET_PAGE_MASK;
++    last |= ~TARGET_PAGE_MASK;
+     for (n = interval_tree_iter_first(&targetdata_root, start, last),
+          next = n ? interval_tree_iter_next(n, start, last) : NULL;
+@@ -XXX,XX +XXX,XX @@ void *page_get_target_data(target_ulong address)
+     return t->data[(page - region) >> TARGET_PAGE_BITS];
+ }
+ #else
+-void page_reset_target_data(target_ulong start, target_ulong end) { }
++void page_reset_target_data(target_ulong start, target_ulong last) { }
+ #endif /* TARGET_PAGE_DATA_SIZE */
+ /* The softmmu versions of these helpers are in cputlb.c.  */
+diff --git a/linux-user/mmap.c b/linux-user/mmap.c
+index XXXXXXX..XXXXXXX 100644
+--- a/linux-user/mmap.c
++++ b/linux-user/mmap.c
+@@ -XXX,XX +XXX,XX @@ abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
+         if (can_passthrough_madvise(start, end)) {
+             ret = get_errno(madvise(g2h_untagged(start), len, advice));
+             if ((advice == MADV_DONTNEED) && (ret == 0)) {
+-                page_reset_target_data(start, start + len);
++                page_reset_target_data(start, start + len - 1);
+             }
+         }
+     }
+--
+.34.1

-New patch
+[PULL 06/15] accel/tcg: Pass last not end to PAGE_FOR_EACH_TB
+Pass the address of the last byte to be changed, rather than
+the first address past the last byte.  This avoids overflow
+when the last page of the address space is involved.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ accel/tcg/tb-maint.c | 28 ++++++++++++++++------------
+file changed, 16 insertions(+), 12 deletions(-)
+diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/tb-maint.c
++++ b/accel/tcg/tb-maint.c
+@@ -XXX,XX +XXX,XX @@ static void tb_remove(TranslationBlock *tb)
+ }
+ /* TODO: For now, still shared with translate-all.c for system mode. */
+-#define PAGE_FOR_EACH_TB(start, end, pagedesc, T, N)    \
+-    for (T = foreach_tb_first(start, end),              \
+-         N = foreach_tb_next(T, start, end);            \
++#define PAGE_FOR_EACH_TB(start, last, pagedesc, T, N)   \
++    for (T = foreach_tb_first(start, last),             \
++         N = foreach_tb_next(T, start, last);           \
+          T != NULL;                                     \
+-         T = N, N = foreach_tb_next(N, start, end))
++         T = N, N = foreach_tb_next(N, start, last))
+ typedef TranslationBlock *PageForEachNext;
+ static PageForEachNext foreach_tb_first(tb_page_addr_t start,
+-                                        tb_page_addr_t end)
++                                        tb_page_addr_t last)
+ {
+-    IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, end - 1);
++    IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, last);
+     return n ? container_of(n, TranslationBlock, itree) : NULL;
+ }
+ static PageForEachNext foreach_tb_next(PageForEachNext tb,
+                                        tb_page_addr_t start,
+-                                       tb_page_addr_t end)
++                                       tb_page_addr_t last)
+ {
+     IntervalTreeNode *n;
+     if (tb) {
+-        n = interval_tree_iter_next(&tb->itree, start, end - 1);
++        n = interval_tree_iter_next(&tb->itree, start, last);
+         if (n) {
+             return container_of(n, TranslationBlock, itree);
+         }
+@@ -XXX,XX +XXX,XX @@ struct page_collection {
+ };
+ typedef int PageForEachNext;
+-#define PAGE_FOR_EACH_TB(start, end, pagedesc, tb, n) \
++#define PAGE_FOR_EACH_TB(start, last, pagedesc, tb, n) \
+     TB_FOR_EACH_TAGGED((pagedesc)->first_tb, tb, n, page_next)
+ #ifdef CONFIG_DEBUG_TCG
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
+ {
+     TranslationBlock *tb;
+     PageForEachNext n;
++    tb_page_addr_t last = end - 1;
+     assert_memory_lock();
+-    PAGE_FOR_EACH_TB(start, end, unused, tb, n) {
++    PAGE_FOR_EACH_TB(start, last, unused, tb, n) {
+         tb_phys_invalidate__locked(tb);
+     }
+ }
+@@ -XXX,XX +XXX,XX @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
+     bool current_tb_modified;
+     TranslationBlock *tb;
+     PageForEachNext n;
++    tb_page_addr_t last;
+     /*
+      * Without precise smc semantics, or when outside of a TB,
+@@ -XXX,XX +XXX,XX @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
+     assert_memory_lock();
+     current_tb = tcg_tb_lookup(pc);
++    last = addr | ~TARGET_PAGE_MASK;
+     addr &= TARGET_PAGE_MASK;
+     current_tb_modified = false;
+-    PAGE_FOR_EACH_TB(addr, addr + TARGET_PAGE_SIZE, unused, tb, n) {
++    PAGE_FOR_EACH_TB(addr, last, unused, tb, n) {
+         if (current_tb == tb &&
+             (tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
+             /*
+@@ -XXX,XX +XXX,XX @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
+     bool current_tb_modified = false;
+     TranslationBlock *current_tb = retaddr ? tcg_tb_lookup(retaddr) : NULL;
+ #endif /* TARGET_HAS_PRECISE_SMC */
++    tb_page_addr_t last G_GNUC_UNUSED = end - 1;
+     /*
+      * We remove all the TBs in the range [start, end[.
+      * XXX: see if in some cases it could be faster to invalidate all the code
+      */
+-    PAGE_FOR_EACH_TB(start, end, p, tb, n) {
++    PAGE_FOR_EACH_TB(start, last, p, tb, n) {
+         /* NOTE: this is subtle as a TB may span two physical pages */
+         if (n == 0) {
+             /* NOTE: tb_end may be after the end of the page, but
+--
+.34.1

-New patch
+[PULL 07/15] accel/tcg: Pass last not end to page_collection_lock
+Pass the address of the last byte to be changed, rather than
+the first address past the last byte.  This avoids overflow
+when the last page of the address space is involved.
+Fixes a bug in the loop comparision where "<= end" would lock
+one more page than required.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ accel/tcg/tb-maint.c | 22 +++++++++++-----------
+file changed, 11 insertions(+), 11 deletions(-)
+diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/tb-maint.c
++++ b/accel/tcg/tb-maint.c
+@@ -XXX,XX +XXX,XX @@ static gint tb_page_addr_cmp(gconstpointer ap, gconstpointer bp, gpointer udata)
+ }
+ /*
+- * Lock a range of pages ([@start,@end[) as well as the pages of all
++ * Lock a range of pages ([@start,@last]) as well as the pages of all
+  * intersecting TBs.
+  * Locking order: acquire locks in ascending order of page index.
+  */
+ static struct page_collection *page_collection_lock(tb_page_addr_t start,
+-                                                    tb_page_addr_t end)
++                                                    tb_page_addr_t last)
+ {
+     struct page_collection *set = g_malloc(sizeof(*set));
+     tb_page_addr_t index;
+     PageDesc *pd;
+     start >>= TARGET_PAGE_BITS;
+-    end   >>= TARGET_PAGE_BITS;
+-    g_assert(start <= end);
++    last >>= TARGET_PAGE_BITS;
++    g_assert(start <= last);
+     set->tree = q_tree_new_full(tb_page_addr_cmp, NULL, NULL,
+                                 page_entry_destroy);
+@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
+  retry:
+     q_tree_foreach(set->tree, page_entry_lock, NULL);
+-    for (index = start; index <= end; index++) {
++    for (index = start; index <= last; index++) {
+         TranslationBlock *tb;
+         PageForEachNext n;
+@@ -XXX,XX +XXX,XX @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
+ void tb_invalidate_phys_page(tb_page_addr_t addr)
+ {
+     struct page_collection *pages;
+-    tb_page_addr_t start, end;
++    tb_page_addr_t start, last;
+     PageDesc *p;
+     p = page_find(addr >> TARGET_PAGE_BITS);
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
+     }
+     start = addr & TARGET_PAGE_MASK;
+-    end = start + TARGET_PAGE_SIZE;
+-    pages = page_collection_lock(start, end);
+-    tb_invalidate_phys_page_range__locked(pages, p, start, end, 0);
++    last = addr | ~TARGET_PAGE_MASK;
++    pages = page_collection_lock(start, last);
++    tb_invalidate_phys_page_range__locked(pages, p, start, last + 1, 0);
+     page_collection_unlock(pages);
+ }
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
+     struct page_collection *pages;
+     tb_page_addr_t next;
+-    pages = page_collection_lock(start, end);
++    pages = page_collection_lock(start, end - 1);
+     for (next = (start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
+          start < end;
+          start = next, next += TARGET_PAGE_SIZE) {
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range_fast(ram_addr_t ram_addr,
+ {
+     struct page_collection *pages;
+-    pages = page_collection_lock(ram_addr, ram_addr + size);
++    pages = page_collection_lock(ram_addr, ram_addr + size - 1);
+     tb_invalidate_phys_page_fast__locked(pages, ram_addr, size, retaddr);
+     page_collection_unlock(pages);
+ }
+--
+.34.1

-New patch
+[PULL 08/15] accel/tcg: Pass last not end to tb_invalidate_phys_page_range__locked
+Pass the address of the last byte to be changed, rather than
+the first address past the last byte.  This avoids overflow
+when the last page of the address space is involved.
+Properly truncate tb_last to the end of the page; the comment about
+tb_end being past the end of the page being ok is not correct,
+considering overflow.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ accel/tcg/tb-maint.c | 26 ++++++++++++--------------
+file changed, 12 insertions(+), 14 deletions(-)
+diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/tb-maint.c
++++ b/accel/tcg/tb-maint.c
+@@ -XXX,XX +XXX,XX @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
+ static void
+ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
+                                       PageDesc *p, tb_page_addr_t start,
+-                                      tb_page_addr_t end,
++                                      tb_page_addr_t last,
+                                       uintptr_t retaddr)
+ {
+     TranslationBlock *tb;
+-    tb_page_addr_t tb_start, tb_end;
+     PageForEachNext n;
+ #ifdef TARGET_HAS_PRECISE_SMC
+     bool current_tb_modified = false;
+     TranslationBlock *current_tb = retaddr ? tcg_tb_lookup(retaddr) : NULL;
+ #endif /* TARGET_HAS_PRECISE_SMC */
+-    tb_page_addr_t last G_GNUC_UNUSED = end - 1;
+     /*
+-     * We remove all the TBs in the range [start, end[.
++     * We remove all the TBs in the range [start, last].
+      * XXX: see if in some cases it could be faster to invalidate all the code
+      */
+     PAGE_FOR_EACH_TB(start, last, p, tb, n) {
++        tb_page_addr_t tb_start, tb_last;
++
+         /* NOTE: this is subtle as a TB may span two physical pages */
++        tb_start = tb_page_addr0(tb);
++        tb_last = tb_start + tb->size - 1;
+         if (n == 0) {
+-            /* NOTE: tb_end may be after the end of the page, but
+-               it is not a problem */
+-            tb_start = tb_page_addr0(tb);
+-            tb_end = tb_start + tb->size;
++            tb_last = MIN(tb_last, tb_start | ~TARGET_PAGE_MASK);
+         } else {
+             tb_start = tb_page_addr1(tb);
+-            tb_end = tb_start + ((tb_page_addr0(tb) + tb->size)
+-                                 & ~TARGET_PAGE_MASK);
++            tb_last = tb_start + (tb_last & ~TARGET_PAGE_MASK);
+         }
+-        if (!(tb_end <= start || tb_start >= end)) {
++        if (!(tb_last < start || tb_start > last)) {
+ #ifdef TARGET_HAS_PRECISE_SMC
+             if (current_tb == tb &&
+                 (tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
+     start = addr & TARGET_PAGE_MASK;
+     last = addr | ~TARGET_PAGE_MASK;
+     pages = page_collection_lock(start, last);
+-    tb_invalidate_phys_page_range__locked(pages, p, start, last + 1, 0);
++    tb_invalidate_phys_page_range__locked(pages, p, start, last, 0);
+     page_collection_unlock(pages);
+ }
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
+             continue;
+         }
+         assert_page_locked(pd);
+-        tb_invalidate_phys_page_range__locked(pages, pd, start, bound, 0);
++        tb_invalidate_phys_page_range__locked(pages, pd, start, bound - 1, 0);
+     }
+     page_collection_unlock(pages);
+ }
+@@ -XXX,XX +XXX,XX @@ static void tb_invalidate_phys_page_fast__locked(struct page_collection *pages,
+     }
+     assert_page_locked(p);
+-    tb_invalidate_phys_page_range__locked(pages, p, start, start + len, ra);
++    tb_invalidate_phys_page_range__locked(pages, p, start, start + len - 1, ra);
+ }
+ /*
+--
+.34.1

-New patch
+[PULL 09/15] accel/tcg: Pass last not end to tb_invalidate_phys_range
+Pass the address of the last byte to be changed, rather than
+the first address past the last byte.  This avoids overflow
+when the last page of the address space is involved.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ include/exec/exec-all.h   |  2 +-
+ accel/tcg/tb-maint.c      | 31 ++++++++++++++++---------------
+ accel/tcg/translate-all.c |  2 +-
+ accel/tcg/user-exec.c     |  2 +-
+ softmmu/physmem.c         |  2 +-
+files changed, 20 insertions(+), 19 deletions(-)
+diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
+index XXXXXXX..XXXXXXX 100644
+--- a/include/exec/exec-all.h
++++ b/include/exec/exec-all.h
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_addr(target_ulong addr);
+ void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs);
+ #endif
+ void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
+-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end);
++void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last);
+ void tb_set_jmp_target(TranslationBlock *tb, int n, uintptr_t addr);
+ /* GETPC is the true target of the return instruction that we'll execute.  */
+diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/tb-maint.c
++++ b/accel/tcg/tb-maint.c
+@@ -XXX,XX +XXX,XX @@ TranslationBlock *tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
+  * Called with mmap_lock held for user-mode emulation.
+  * NOTE: this function must not be called while a TB is running.
+  */
+-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
++void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last)
+ {
+     TranslationBlock *tb;
+     PageForEachNext n;
+-    tb_page_addr_t last = end - 1;
+     assert_memory_lock();
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
+  */
+ void tb_invalidate_phys_page(tb_page_addr_t addr)
+ {
+-    tb_page_addr_t start, end;
++    tb_page_addr_t start, last;
+     start = addr & TARGET_PAGE_MASK;
+-    end = start + TARGET_PAGE_SIZE;
+-    tb_invalidate_phys_range(start, end);
++    last = addr | ~TARGET_PAGE_MASK;
++    tb_invalidate_phys_range(start, last);
+ }
+ /*
+@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
+ /*
+  * Invalidate all TBs which intersect with the target physical address range
+- * [start;end[. NOTE: start and end may refer to *different* physical pages.
++ * [start;last]. NOTE: start and end may refer to *different* physical pages.
+  * 'is_cpu_write_access' should be true if called from a real cpu write
+  * access: the virtual CPU will exit the current TB if code is modified inside
+  * this TB.
+  */
+-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
++void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last)
+ {
+     struct page_collection *pages;
+-    tb_page_addr_t next;
++    tb_page_addr_t index, index_last;
+-    pages = page_collection_lock(start, end - 1);
+-    for (next = (start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
+-         start < end;
+-         start = next, next += TARGET_PAGE_SIZE) {
+-        PageDesc *pd = page_find(start >> TARGET_PAGE_BITS);
+-        tb_page_addr_t bound = MIN(next, end);
++    pages = page_collection_lock(start, last);
++
++    index_last = last >> TARGET_PAGE_BITS;
++    for (index = start >> TARGET_PAGE_BITS; index <= index_last; index++) {
++        PageDesc *pd = page_find(index);
++        tb_page_addr_t bound;
+         if (pd == NULL) {
+             continue;
+         }
+         assert_page_locked(pd);
+-        tb_invalidate_phys_page_range__locked(pages, pd, start, bound - 1, 0);
++        bound = (index << TARGET_PAGE_BITS) | ~TARGET_PAGE_MASK;
++        bound = MIN(bound, last);
++        tb_invalidate_phys_page_range__locked(pages, pd, start, bound, 0);
+     }
+     page_collection_unlock(pages);
+ }
+diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/translate-all.c
++++ b/accel/tcg/translate-all.c
+@@ -XXX,XX +XXX,XX @@ void tb_check_watchpoint(CPUState *cpu, uintptr_t retaddr)
+         cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
+         addr = get_page_addr_code(env, pc);
+         if (addr != -1) {
+-            tb_invalidate_phys_range(addr, addr + 1);
++            tb_invalidate_phys_range(addr, addr);
+         }
+     }
+ }
+diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
+index XXXXXXX..XXXXXXX 100644
+--- a/accel/tcg/user-exec.c
++++ b/accel/tcg/user-exec.c
+@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong last, int flags)
+                                         ~(reset ? 0 : PAGE_STICKY));
+     }
+     if (inval_tb) {
+-        tb_invalidate_phys_range(start, last + 1);
++        tb_invalidate_phys_range(start, last);
+     }
+ }
+diff --git a/softmmu/physmem.c b/softmmu/physmem.c
+index XXXXXXX..XXXXXXX 100644
+--- a/softmmu/physmem.c
++++ b/softmmu/physmem.c
+@@ -XXX,XX +XXX,XX @@ static void invalidate_and_set_dirty(MemoryRegion *mr, hwaddr addr,
+     }
+     if (dirty_log_mask & (1 << DIRTY_MEMORY_CODE)) {
+         assert(tcg_enabled());
+-        tb_invalidate_phys_range(addr, addr + length);
++        tb_invalidate_phys_range(addr, addr + length - 1);
+         dirty_log_mask &= ~(1 << DIRTY_MEMORY_CODE);
+     }
+     cpu_physical_memory_set_dirty_range(addr, length, dirty_log_mask);
+--
+.34.1

-New patch
+[PULL 10/15] linux-user: Pass last not end to probe_guest_base
+Pass the address of the last byte of the image, rather than
+the first address past the last byte.  This avoids overflow
+when the last page of the address space is involved.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ linux-user/user-internals.h | 12 ++++++------
+ linux-user/elfload.c        | 24 ++++++++++++------------
+ linux-user/flatload.c       |  2 +-
+files changed, 19 insertions(+), 19 deletions(-)
+diff --git a/linux-user/user-internals.h b/linux-user/user-internals.h
+index XXXXXXX..XXXXXXX 100644
+--- a/linux-user/user-internals.h
++++ b/linux-user/user-internals.h
+@@ -XXX,XX +XXX,XX @@ void fork_end(int child);
+ /**
+  * probe_guest_base:
+  * @image_name: the executable being loaded
+- * @loaddr: the lowest fixed address in the executable
+- * @hiaddr: the highest fixed address in the executable
++ * @loaddr: the lowest fixed address within the executable
++ * @hiaddr: the highest fixed address within the executable
+  *
+  * Creates the initial guest address space in the host memory space.
+  *
+- * If @loaddr == 0, then no address in the executable is fixed,
+- * i.e. it is fully relocatable.  In that case @hiaddr is the size
+- * of the executable.
++ * If @loaddr == 0, then no address in the executable is fixed, i.e.
++ * it is fully relocatable.  In that case @hiaddr is the size of the
++ * executable minus one.
+  *
+  * This function will not return if a valid value for guest_base
+  * cannot be chosen.  On return, the executable loader can expect
+  *
+- *    target_mmap(loaddr, hiaddr - loaddr, ...)
++ *    target_mmap(loaddr, hiaddr - loaddr + 1, ...)
+  *
+  * to succeed.
+  */
+diff --git a/linux-user/elfload.c b/linux-user/elfload.c
+index XXXXXXX..XXXXXXX 100644
+--- a/linux-user/elfload.c
++++ b/linux-user/elfload.c
+@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
+         if (guest_hiaddr > reserved_va) {
+             error_report("%s: requires more than reserved virtual "
+                          "address space (0x%" PRIx64 " > 0x%lx)",
+-                         image_name, (uint64_t)guest_hiaddr, reserved_va);
++                         image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
+             exit(EXIT_FAILURE);
+         }
+     } else {
+@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
+         if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) {
+             error_report("%s: requires more virtual address space "
+                          "than the host can provide (0x%" PRIx64 ")",
+-                         image_name, (uint64_t)guest_hiaddr - guest_base);
++                         image_name, (uint64_t)guest_hiaddr + 1 - guest_base);
+             exit(EXIT_FAILURE);
+         }
+ #endif
+@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
+     if (reserved_va) {
+         guest_loaddr = (guest_base >= mmap_min_addr ? 0
+                         : mmap_min_addr - guest_base);
+-        guest_hiaddr = reserved_va;
++        guest_hiaddr = reserved_va - 1;
+     }
+     /* Reserve the address space for the binary, or reserved_va. */
+     test = g2h_untagged(guest_loaddr);
+-    addr = mmap(test, guest_hiaddr - guest_loaddr, PROT_NONE, flags, -1, 0);
++    addr = mmap(test, guest_hiaddr - guest_loaddr + 1, PROT_NONE, flags, -1, 0);
+     if (test != addr) {
+         pgb_fail_in_use(image_name);
+     }
+     qemu_log_mask(CPU_LOG_PAGE,
+-                  "%s: base @ %p for " TARGET_ABI_FMT_ld " bytes\n",
+-                  __func__, addr, guest_hiaddr - guest_loaddr);
++                  "%s: base @ %p for %" PRIu64 " bytes\n",
++                  __func__, addr, (uint64_t)guest_hiaddr - guest_loaddr + 1);
+ }
+ /**
+@@ -XXX,XX +XXX,XX @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr,
+     if (hiaddr != orig_hiaddr) {
+         error_report("%s: requires virtual address space that the "
+                      "host cannot provide (0x%" PRIx64 ")",
+-                     image_name, (uint64_t)orig_hiaddr);
++                     image_name, (uint64_t)orig_hiaddr + 1);
+         exit(EXIT_FAILURE);
+     }
+@@ -XXX,XX +XXX,XX @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr,
+          * arithmetic wraps around.
+          */
+         if (sizeof(uintptr_t) == 8 || loaddr >= 0x80000000u) {
+-            hiaddr = (uintptr_t) 4 << 30;
++            hiaddr = UINT32_MAX;
+         } else {
+             offset = -(HI_COMMPAGE & -align);
+         }
+@@ -XXX,XX +XXX,XX @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr,
+         loaddr = MIN(loaddr, LO_COMMPAGE & -align);
+     }
+-    addr = pgb_find_hole(loaddr, hiaddr - loaddr, align, offset);
++    addr = pgb_find_hole(loaddr, hiaddr - loaddr + 1, align, offset);
+     if (addr == -1) {
+         /*
+          * If HI_COMMPAGE, there *might* be a non-consecutive allocation
+@@ -XXX,XX +XXX,XX @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr,
+     if (guest_hiaddr > reserved_va) {
+         error_report("%s: requires more than reserved virtual "
+                      "address space (0x%" PRIx64 " > 0x%lx)",
+-                     image_name, (uint64_t)guest_hiaddr, reserved_va);
++                     image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
+         exit(EXIT_FAILURE);
+     }
+@@ -XXX,XX +XXX,XX @@ static void load_elf_image(const char *image_name, int image_fd,
+             if (a < loaddr) {
+                 loaddr = a;
+             }
+-            a = eppnt->p_vaddr + eppnt->p_memsz;
++            a = eppnt->p_vaddr + eppnt->p_memsz - 1;
+             if (a > hiaddr) {
+                 hiaddr = a;
+             }
+@@ -XXX,XX +XXX,XX @@ static void load_elf_image(const char *image_name, int image_fd,
+      * In both cases, we will overwrite pages in this range with mappings
+      * from the executable.
+      */
+-    load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE,
++    load_addr = target_mmap(loaddr, (size_t)hiaddr - loaddr + 1, PROT_NONE,
+                             MAP_PRIVATE | MAP_ANON | MAP_NORESERVE |
+                             (ehdr->e_type == ET_EXEC ? MAP_FIXED : 0),
+                             -1, 0);
+diff --git a/linux-user/flatload.c b/linux-user/flatload.c
+index XXXXXXX..XXXXXXX 100644
+--- a/linux-user/flatload.c
++++ b/linux-user/flatload.c
+@@ -XXX,XX +XXX,XX @@ static int load_flat_file(struct linux_binprm * bprm,
+      * Allocate the address space.
+      */
+     probe_guest_base(bprm->filename, 0,
+-                     text_len + data_len + extra + indx_len);
++                     text_len + data_len + extra + indx_len - 1);
+     /*
+      * there are a couple of cases here,  the separate code/data
+--
+.34.1

-New patch
+[PULL 11/15] include/exec: Change reserved_va semantics to last byte
+Change the semantics to be the last byte of the guest va, rather
 than the following byte.  This avoids some overflow conditions.
 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 ---
  include/exec/cpu-all.h      | 11 ++++++++++-
  linux-user/arm/target_cpu.h |  2 +-
  bsd-user/main.c             | 10 +++-------
  bsd-user/mmap.c             |  4 ++--
  linux-user/elfload.c        | 14 +++++++-------
  linux-user/main.c           | 27 +++++++++++++--------------
  linux-user/mmap.c           |  4 ++--
 files changed, 38 insertions(+), 34 deletions(-)
 diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
 index XXXXXXX..XXXXXXX 100644
 --- a/include/exec/cpu-all.h
 +++ b/include/exec/cpu-all.h
@@ -XXX,XX +XXX,XX @@ static inline void tswap64s(uint64_t *s)
   */
  extern uintptr_t guest_base;
  extern bool have_guest_base;
 +
 +/*
 + * If non-zero, the guest virtual address space is a contiguous subset
 + * of the host virtual address space, i.e. '-R reserved_va' is in effect
 + * either from the command-line or by default.  The value is the last
 + * byte of the guest address space e.g. UINT32_MAX.
 + *
 + * If zero, the host and guest virtual address spaces are intermingled.
 + */
  extern unsigned long reserved_va;
  /*
@@ -XXX,XX +XXX,XX @@ extern unsigned long reserved_va;
  #define GUEST_ADDR_MAX_                                                 \
      ((MIN_CONST(TARGET_VIRT_ADDR_SPACE_BITS, TARGET_ABI_BITS) <= 32) ?  \
       UINT32_MAX : ~0ul)
 -#define GUEST_ADDR_MAX    (reserved_va ? reserved_va - 1 : GUEST_ADDR_MAX_)
 +#define GUEST_ADDR_MAX    (reserved_va ? : GUEST_ADDR_MAX_)
  #else
 diff --git a/linux-user/arm/target_cpu.h b/linux-user/arm/target_cpu.h
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/arm/target_cpu.h
 +++ b/linux-user/arm/target_cpu.h
@@ -XXX,XX +XXX,XX @@ static inline unsigned long arm_max_reserved_va(CPUState *cs)
           * the high addresses.  Restrict linux-user to the
           * cached write-back RAM in the system map.
           */
 -        return 0x80000000ul;
 +        return 0x7ffffffful;
      } else {
          /*
           * We need to be able to map the commpage.
 diff --git a/bsd-user/main.c b/bsd-user/main.c
 index XXXXXXX..XXXXXXX 100644
 --- a/bsd-user/main.c
 +++ b/bsd-user/main.c
@@ -XXX,XX +XXX,XX @@ bool have_guest_base;
  # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
  #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
        (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
 -/*
 - * There are a number of places where we assign reserved_va to a variable
 - * of type abi_ulong and expect it to fit.  Avoid the last page.
 - */
 -#   define MAX_RESERVED_VA  (0xfffffffful & TARGET_PAGE_MASK)
 +#   define MAX_RESERVED_VA  0xfffffffful
  #  else
 -#   define MAX_RESERVED_VA  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
 +#   define MAX_RESERVED_VA  ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
  #  endif
  # else
  #  define MAX_RESERVED_VA  0
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv)
      envlist_free(envlist);
      if (reserved_va) {
 -            mmap_next_start = reserved_va;
 +        mmap_next_start = reserved_va + 1;
      }
      {
 diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
 index XXXXXXX..XXXXXXX 100644
 --- a/bsd-user/mmap.c
 +++ b/bsd-user/mmap.c
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
      size = HOST_PAGE_ALIGN(size) + alignment;
      end_addr = start + size;
      if (end_addr > reserved_va) {
 -        end_addr = reserved_va;
 +        end_addr = reserved_va + 1;
      }
      addr = end_addr - qemu_host_page_size;
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
              if (looped) {
                  return (abi_ulong)-1;
              }
 -            end_addr = reserved_va;
 +            end_addr = reserved_va + 1;
              addr = end_addr - qemu_host_page_size;
              looped = 1;
              continue;
 diff --git a/linux-user/elfload.c b/linux-user/elfload.c
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/elfload.c
 +++ b/linux-user/elfload.c
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
       * has specified -R reserved_va, which would trigger an assert().
       */
      if (reserved_va != 0 &&
 -        TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE >= reserved_va) {
 +        TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) {
          error_report("Cannot allocate vsyscall page");
          exit(EXIT_FAILURE);
      }
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
          if (guest_hiaddr > reserved_va) {
              error_report("%s: requires more than reserved virtual "
                           "address space (0x%" PRIx64 " > 0x%lx)",
 -                         image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
 +                         image_name, (uint64_t)guest_hiaddr, reserved_va);
              exit(EXIT_FAILURE);
          }
      } else {
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
      if (reserved_va) {
          guest_loaddr = (guest_base >= mmap_min_addr ? 0
                          : mmap_min_addr - guest_base);
 -        guest_hiaddr = reserved_va - 1;
 +        guest_hiaddr = reserved_va;
      }
      /* Reserve the address space for the binary, or reserved_va. */
@@ -XXX,XX +XXX,XX @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr,
      if (guest_hiaddr > reserved_va) {
          error_report("%s: requires more than reserved virtual "
                       "address space (0x%" PRIx64 " > 0x%lx)",
 -                     image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
 +                     image_name, (uint64_t)guest_hiaddr, reserved_va);
          exit(EXIT_FAILURE);
      }
@@ -XXX,XX +XXX,XX @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr,
      /* Reserve the memory on the host. */
      assert(guest_base != 0);
      test = g2h_untagged(0);
 -    addr = mmap(test, reserved_va, PROT_NONE, flags, -1, 0);
 +    addr = mmap(test, reserved_va + 1, PROT_NONE, flags, -1, 0);
      if (addr == MAP_FAILED || addr != test) {
          error_report("Unable to reserve 0x%lx bytes of virtual address "
                       "space at %p (%s) for use as guest address space (check your "
                       "virtual memory ulimit setting, min_mmap_addr or reserve less "
 -                     "using -R option)", reserved_va, test, strerror(errno));
 +                     "using -R option)", reserved_va + 1, test, strerror(errno));
          exit(EXIT_FAILURE);
      }
      qemu_log_mask(CPU_LOG_PAGE, "%s: base @ %p for %lu bytes\n",
 -                  __func__, addr, reserved_va);
 +                  __func__, addr, reserved_va + 1);
  }
  void probe_guest_base(const char *image_name, abi_ulong guest_loaddr,
 diff --git a/linux-user/main.c b/linux-user/main.c
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/main.c
 +++ b/linux-user/main.c
@@ -XXX,XX +XXX,XX @@ static const char *last_log_filename;
  # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
  #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
        (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
 -/* There are a number of places where we assign reserved_va to a variable
 -   of type abi_ulong and expect it to fit.  Avoid the last page.  */
 -#   define MAX_RESERVED_VA(CPU)  (0xfffffffful & TARGET_PAGE_MASK)
 +#   define MAX_RESERVED_VA(CPU)  0xfffffffful
  #  else
 -#   define MAX_RESERVED_VA(CPU)  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
 +#   define MAX_RESERVED_VA(CPU)  ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
  #  endif
  # else
  #  define MAX_RESERVED_VA(CPU)  0
@@ -XXX,XX +XXX,XX @@ static void handle_arg_reserved_va(const char *arg)
  {
      char *p;
      int shift = 0;
 -    reserved_va = strtoul(arg, &p, 0);
 +    unsigned long val;
 +
 +    val = strtoul(arg, &p, 0);
      switch (*p) {
      case 'k':
      case 'K':
@@ -XXX,XX +XXX,XX @@ static void handle_arg_reserved_va(const char *arg)
          break;
      }
      if (shift) {
 -        unsigned long unshifted = reserved_va;
 +        unsigned long unshifted = val;
          p++;
 -        reserved_va <<= shift;
 -        if (reserved_va >> shift != unshifted) {
 +        val <<= shift;
 +        if (val >> shift != unshifted) {
              fprintf(stderr, "Reserved virtual address too big\n");
              exit(EXIT_FAILURE);
          }
@@ -XXX,XX +XXX,XX @@ static void handle_arg_reserved_va(const char *arg)
          fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
          exit(EXIT_FAILURE);
      }
 +    /* The representation is size - 1, with 0 remaining "default". */
 +    reserved_va = val ? val - 1 : 0;
  }
  static void handle_arg_singlestep(const char *arg)
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv, char **envp)
       */
      max_reserved_va = MAX_RESERVED_VA(cpu);
      if (reserved_va != 0) {
 -        if (reserved_va % qemu_host_page_size) {
 +        if ((reserved_va + 1) % qemu_host_page_size) {
              char *s = size_to_str(qemu_host_page_size);
              fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
              g_free(s);
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv, char **envp)
              exit(EXIT_FAILURE);
          }
      } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
 -        /*
 -         * reserved_va must be aligned with the host page size
 -         * as it is used with mmap()
 -         */
 -        reserved_va = max_reserved_va & qemu_host_page_mask;
 +        /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */
 +        reserved_va = max_reserved_va;
      }
      {
 diff --git a/linux-user/mmap.c b/linux-user/mmap.c
 index XXXXXXX..XXXXXXX 100644
 --- a/linux-user/mmap.c
 +++ b/linux-user/mmap.c
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
      end_addr = start + size;
      if (start > reserved_va - size) {
          /* Start at the top of the address space.  */
 -        end_addr = ((reserved_va - size) & -align) + size;
 +        end_addr = ((reserved_va + 1 - size) & -align) + size;
          looped = true;
      }
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
                  return (abi_ulong)-1;
              }
              /* Re-start at the top of the address space.  */
 -            addr = end_addr = ((reserved_va - size) & -align) + size;
 +            addr = end_addr = ((reserved_va + 1 - size) & -align) + size;
              looped = true;
          } else {
              prot = page_get_flags(addr);
 --
 .34.1

-New patch
+[PULL 12/15] linux-user/arm: Take more care allocating commpage
+User setting of -R reserved_va can lead to an assertion
+failure in page_set_flags.  Sanity check the value of
+reserved_va and print an error message instead.  Do not
+allocate a commpage at all for m-profile cpus.
+Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
+---
+ linux-user/elfload.c | 37 +++++++++++++++++++++++++++----------
+file changed, 27 insertions(+), 10 deletions(-)
+diff --git a/linux-user/elfload.c b/linux-user/elfload.c
+index XXXXXXX..XXXXXXX 100644
+--- a/linux-user/elfload.c
++++ b/linux-user/elfload.c
+@@ -XXX,XX +XXX,XX @@ enum {
+ static bool init_guest_commpage(void)
+ {
+-    abi_ptr commpage = HI_COMMPAGE & -qemu_host_page_size;
+-    void *want = g2h_untagged(commpage);
+-    void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
+-                      MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
++    ARMCPU *cpu = ARM_CPU(thread_cpu);
++    abi_ptr want = HI_COMMPAGE & TARGET_PAGE_MASK;
++    abi_ptr addr;
+-    if (addr == MAP_FAILED) {
++    /*
++     * M-profile allocates maximum of 2GB address space, so can never
++     * allocate the commpage.  Skip it.
++     */
++    if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
++        return true;
++    }
++
++    /*
++     * If reserved_va does not cover the commpage, we get an assert
++     * in page_set_flags.  Produce an intelligent error instead.
++     */
++    if (reserved_va != 0 && want + TARGET_PAGE_SIZE - 1 > reserved_va) {
++        error_report("Allocating guest commpage: -R 0x%" PRIx64 " too small",
++                     (uint64_t)reserved_va + 1);
++        exit(EXIT_FAILURE);
++    }
++
++    addr = target_mmap(want, TARGET_PAGE_SIZE, PROT_READ | PROT_WRITE,
++                       MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
++
++    if (addr == -1) {
+         perror("Allocating guest commpage");
+         exit(EXIT_FAILURE);
+     }
+@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
+     }
+     /* Set kernel helper versions; rest of page is 0.  */
+-    __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu));
++    put_user_u32(5, 0xffff0ffcu);
+-    if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
++    if (target_mprotect(addr, qemu_host_page_size, PROT_READ | PROT_EXEC)) {
+         perror("Protecting guest commpage");
+         exit(EXIT_FAILURE);
+     }
+-
+-    page_set_flags(commpage, commpage | ~qemu_host_page_mask,
+-                   PAGE_READ | PAGE_EXEC | PAGE_VALID);
+     return true;
+ }
+--
+.34.1

-[PULL 3/3] tcg/tci: Use tcg_out_ldst in tcg_out_st
+[PULL 13/15] softmmu: Restrict cpu_check_watchpoint / address_matches to TCG accel
-The tcg_out_ldst helper will handle out-of-range offsets.
+From: Philippe Mathieu-Daudé <philmd@linaro.org>
 We haven't actually encountered any, since we haven't run
 across the assert within tcg_out_op_rrs, but an out-of-range
 offset would not be impossible in future.
-Fixes: 65089889183 ("tcg/tci: Change encoding to uint32_t units")
+Both cpu_check_watchpoint() and cpu_watchpoint_address_matches()
-Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
+are specific to TCG system emulation. Declare them in "tcg-cpu-ops.h"
 to be sure accessing them from non-TCG code is a compilation error.
 Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
 Message-Id: <20230328173117.15226-2-philmd@linaro.org>
 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 ---
- tcg/tci/tcg-target.c.inc | 5 ++---
+ include/hw/core/cpu.h         | 37 ------------------------------
-file changed, 2 insertions(+), 3 deletions(-)
+ include/hw/core/tcg-cpu-ops.h | 43 +++++++++++++++++++++++++++++++++++
  target/arm/tcg/mte_helper.c   |  1 +
  target/arm/tcg/sve_helper.c   |  1 +
  target/s390x/tcg/mem_helper.c |  1 +
 files changed, 46 insertions(+), 37 deletions(-)
-diff --git a/tcg/tci/tcg-target.c.inc b/tcg/tci/tcg-target.c.inc
+diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
 index XXXXXXX..XXXXXXX 100644
---- a/tcg/tci/tcg-target.c.inc
+--- a/include/hw/core/cpu.h
-+++ b/tcg/tci/tcg-target.c.inc
++++ b/include/hw/core/cpu.h
-@@ -XXX,XX +XXX,XX @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
+@@ -XXX,XX +XXX,XX @@ static inline void cpu_watchpoint_remove_by_ref(CPUState *cpu,
- static void tcg_out_st(TCGContext *s, TCGType type, TCGReg val, TCGReg base,
+ static inline void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
                         intptr_t offset)
  {
--    stack_bounds_check(base, offset);
+ }
-     switch (type) {
+-
-     case TCG_TYPE_I32:
+-static inline void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
--        tcg_out_op_rrs(s, INDEX_op_st_i32, val, base, offset);
+-                                        MemTxAttrs atr, int fl, uintptr_t ra)
-+        tcg_out_ldst(s, INDEX_op_st_i32, val, base, offset);
+-{
-         break;
+-}
- #if TCG_TARGET_REG_BITS == 64
+-
-     case TCG_TYPE_I64:
+-static inline int cpu_watchpoint_address_matches(CPUState *cpu,
--        tcg_out_op_rrs(s, INDEX_op_st_i64, val, base, offset);
+-                                                 vaddr addr, vaddr len)
-+        tcg_out_ldst(s, INDEX_op_st_i64, val, base, offset);
+-{
-         break;
+-    return 0;
 -}
  #else
  int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
                            int flags, CPUWatchpoint **watchpoint);
@@ -XXX,XX +XXX,XX @@ int cpu_watchpoint_remove(CPUState *cpu, vaddr addr,
                            vaddr len, int flags);
  void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint);
  void cpu_watchpoint_remove_all(CPUState *cpu, int mask);
 -
 -/**
 - * cpu_check_watchpoint:
 - * @cpu: cpu context
 - * @addr: guest virtual address
 - * @len: access length
 - * @attrs: memory access attributes
 - * @flags: watchpoint access type
 - * @ra: unwind return address
 - *
 - * Check for a watchpoint hit in [addr, addr+len) of the type
 - * specified by @flags.  Exit via exception with a hit.
 - */
 -void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
 -                          MemTxAttrs attrs, int flags, uintptr_t ra);
 -
 -/**
 - * cpu_watchpoint_address_matches:
 - * @cpu: cpu context
 - * @addr: guest virtual address
 - * @len: access length
 - *
 - * Return the watchpoint flags that apply to [addr, addr+len).
 - * If no watchpoint is registered for the range, the result is 0.
 - */
 -int cpu_watchpoint_address_matches(CPUState *cpu, vaddr addr, vaddr len);
  #endif
-     default:
  /**
 diff --git a/include/hw/core/tcg-cpu-ops.h b/include/hw/core/tcg-cpu-ops.h
 index XXXXXXX..XXXXXXX 100644
 --- a/include/hw/core/tcg-cpu-ops.h
 +++ b/include/hw/core/tcg-cpu-ops.h
@@ -XXX,XX +XXX,XX @@ struct TCGCPUOps {
  };
 +#if defined(CONFIG_USER_ONLY)
 +
 +static inline void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
 +                                        MemTxAttrs atr, int fl, uintptr_t ra)
 +{
 +}
 +
 +static inline int cpu_watchpoint_address_matches(CPUState *cpu,
 +                                                 vaddr addr, vaddr len)
 +{
 +    return 0;
 +}
 +
 +#else
 +
 +/**
 + * cpu_check_watchpoint:
 + * @cpu: cpu context
 + * @addr: guest virtual address
 + * @len: access length
 + * @attrs: memory access attributes
 + * @flags: watchpoint access type
 + * @ra: unwind return address
 + *
 + * Check for a watchpoint hit in [addr, addr+len) of the type
 + * specified by @flags.  Exit via exception with a hit.
 + */
 +void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
 +                          MemTxAttrs attrs, int flags, uintptr_t ra);
 +
 +/**
 + * cpu_watchpoint_address_matches:
 + * @cpu: cpu context
 + * @addr: guest virtual address
 + * @len: access length
 + *
 + * Return the watchpoint flags that apply to [addr, addr+len).
 + * If no watchpoint is registered for the range, the result is 0.
 + */
 +int cpu_watchpoint_address_matches(CPUState *cpu, vaddr addr, vaddr len);
 +
 +#endif
 +
  #endif /* TCG_CPU_OPS_H */
 diff --git a/target/arm/tcg/mte_helper.c b/target/arm/tcg/mte_helper.c
 index XXXXXXX..XXXXXXX 100644
 --- a/target/arm/tcg/mte_helper.c
 +++ b/target/arm/tcg/mte_helper.c
@@ -XXX,XX +XXX,XX @@
  #include "exec/ram_addr.h"
  #include "exec/cpu_ldst.h"
  #include "exec/helper-proto.h"
 +#include "hw/core/tcg-cpu-ops.h"
  #include "qapi/error.h"
  #include "qemu/guest-random.h"
 diff --git a/target/arm/tcg/sve_helper.c b/target/arm/tcg/sve_helper.c
 index XXXXXXX..XXXXXXX 100644
 --- a/target/arm/tcg/sve_helper.c
 +++ b/target/arm/tcg/sve_helper.c
@@ -XXX,XX +XXX,XX @@
  #include "tcg/tcg.h"
  #include "vec_internal.h"
  #include "sve_ldst_internal.h"
 +#include "hw/core/tcg-cpu-ops.h"
  /* Return a value for NZCV as per the ARM PredTest pseudofunction.
 diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c
 index XXXXXXX..XXXXXXX 100644
 --- a/target/s390x/tcg/mem_helper.c
 +++ b/target/s390x/tcg/mem_helper.c
@@ -XXX,XX +XXX,XX @@
  #include "exec/helper-proto.h"
  #include "exec/exec-all.h"
  #include "exec/cpu_ldst.h"
 +#include "hw/core/tcg-cpu-ops.h"
  #include "qemu/int128.h"
  #include "qemu/atomic128.h"
  #include "trace.h"
 --
-.25.1
+.34.1

-[PULL 2/3] accel/tcg/cpu-exec: Fix precise single-stepping after interrupt
+[PULL 14/15] softmmu/watchpoint: Add missing 'qemu/error-report.h' include
-From: Luc Michel <lmichel@kalray.eu>
+From: Philippe Mathieu-Daudé <philmd@linaro.org>
-In some cases, cpu->exit_request can be false after handling the
+cpu_watchpoint_insert() calls error_report() which is declared
-interrupt, leading to another TB being executed instead of returning
+in "qemu/error-report.h". When moving this code in commit 2609ec2868
-to the main loop.
+("softmmu: Extract watchpoint API from physmem.c") we neglected to
 include this header. This works so far because it is indirectly
 included by TCG headers -> "qemu/plugin.h" -> "qemu/error-report.h".
-Fix this by returning true unconditionally when in single-step mode.
+Currently cpu_watchpoint_insert() is only built with the TCG
 accelerator. When building it with other ones (or without TCG)
 we get:
-Fixes: ba3c35d9c402 ("tcg/cpu-exec: precise single-stepping after an interrupt")
+  softmmu/watchpoint.c:38:9: error: implicit declaration of function 'error_report' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
-Signed-off-by: Luc Michel <lmichel@kalray.eu>
+        error_report("tried to set invalid watchpoint at %"
-Message-Id: <20220214132656.11397-1-lmichel@kalray.eu>
+        ^
-[rth: Unlock iothread mutex; simplify indentation]
 Include "qemu/error-report.h" in order to fix this for non-TCG
 builds.
 Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
 Message-Id: <20230328173117.15226-3-philmd@linaro.org>
 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 ---
- accel/tcg/cpu-exec.c | 8 ++++++--
+ softmmu/watchpoint.c | 1 +
-file changed, 6 insertions(+), 2 deletions(-)
+file changed, 1 insertion(+)
-diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
+diff --git a/softmmu/watchpoint.c b/softmmu/watchpoint.c
 index XXXXXXX..XXXXXXX 100644
---- a/accel/tcg/cpu-exec.c
+--- a/softmmu/watchpoint.c
-+++ b/accel/tcg/cpu-exec.c
++++ b/softmmu/watchpoint.c
-@@ -XXX,XX +XXX,XX @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
+@@ -XXX,XX +XXX,XX @@
-                  * raised when single-stepping so that GDB doesn't miss the
-                  * next instruction.
+ #include "qemu/osdep.h"
-                  */
+ #include "qemu/main-loop.h"
--                cpu->exception_index =
++#include "qemu/error-report.h"
--                    (cpu->singlestep_enabled ? EXCP_DEBUG : -1);
+ #include "exec/exec-all.h"
-+                if (unlikely(cpu->singlestep_enabled)) {
+ #include "exec/translate-all.h"
-+                    cpu->exception_index = EXCP_DEBUG;
+ #include "sysemu/tcg.h"
 +                    qemu_mutex_unlock_iothread();
 +                    return true;
 +                }
 +                cpu->exception_index = -1;
                  *last_tb = NULL;
              }
              /* The target hook may have updated the 'cpu->interrupt_request';
 --
-.25.1
+.34.1

-[PULL 1/3] tcg: Remove dh_alias indirection for dh_typecode
+[PULL 15/15] softmmu: Restore use of CPU watchpoint for all accelerators
-The dh_alias redirect is intended to handle TCG types as distinguished
+From: Philippe Mathieu-Daudé <philmd@linaro.org>
 from C types.  TCG does not distinguish signed int from unsigned int,
 because they are the same size.  However, we need to retain this
 distinction for dh_typecode, lest we fail to extend abi types properly
 for the host call parameters.
-This bug was detected when running the 'arm' emulator on an s390
+CPU watchpoints can be use by non-TCG accelerators.
 system. The s390 uses TCG_TARGET_EXTEND_ARGS which triggers code
 in tcg_gen_callN to extend 32 bit values to 64 bits; the incorrect
 sign data in the typemask for each argument caused the values to be
 extended as unsigned values.
-This simple program exhibits the problem:
+KVM uses them:
-    static volatile int num = -9;
+  $ git grep CPUWatchpoint|fgrep kvm
-    static volatile int den = -5;
+  target/arm/kvm64.c:1558:        CPUWatchpoint *wp = find_hw_watchpoint(cs, debug_exit->far);
-    int main(void)
+  target/i386/kvm/kvm.c:5216:static CPUWatchpoint hw_watchpoint;
-    {
+  target/ppc/kvm.c:443:static CPUWatchpoint hw_watchpoint;
-        int quo = num / den;
+  target/s390x/kvm/kvm.c:139:static CPUWatchpoint hw_watchpoint;
         printf("num %d den %d quo %d\n", num, den, quo);
         exit(0);
     }
-When run on the broken qemu, this results in:
+See for example commit e4482ab7e3 ("target-arm: kvm - add support
 for HW assisted debug"):
-    num -9 den -5 quo 0
+     This adds basic support for HW assisted debug. The ioctl interface
      to KVM allows us to pass an implementation defined number of break
      and watch point registers. [...]
-The correct result is:
+This partially reverts commit 2609ec2868e6c286e755a73b4504714a0296a.
-    num -9 den -5 quo 1
+Fixes: 2609ec2868 ("softmmu: Extract watchpoint API from physmem.c")
+Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
-Fixes: 7319d83a735 ("tcg: Combine dh_is_64bit and dh_is_signed to dh_typecode")
+Message-Id: <20230328173117.15226-4-philmd@linaro.org>
 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/876
 Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
 Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
 Tested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
 Tested-by: Keith Packard <keithp@keithp.com>
 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
 ---
- include/exec/helper-head.h   | 19 ++++++++++---------
+ include/hw/core/cpu.h | 2 +-
- target/hppa/helper.h         |  2 ++
+ softmmu/watchpoint.c  | 4 ++++
- target/i386/ops_sse_header.h |  3 +++
+ softmmu/meson.build   | 2 +-
- target/m68k/helper.h         |  1 +
+files changed, 6 insertions(+), 2 deletions(-)
  target/ppc/helper.h          |  3 +++
 files changed, 19 insertions(+), 9 deletions(-)
-diff --git a/include/exec/helper-head.h b/include/exec/helper-head.h
+diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
 index XXXXXXX..XXXXXXX 100644
---- a/include/exec/helper-head.h
+--- a/include/hw/core/cpu.h
-+++ b/include/exec/helper-head.h
++++ b/include/hw/core/cpu.h
-@@ -XXX,XX +XXX,XX @@
+@@ -XXX,XX +XXX,XX @@ static inline bool cpu_breakpoint_test(CPUState *cpu, vaddr pc, int mask)
- # ifdef TARGET_LONG_BITS
+     return false;
- #  if TARGET_LONG_BITS == 32
+ }
- #   define dh_alias_tl i32
-+#   define dh_typecode_tl dh_typecode_i32
+-#if !defined(CONFIG_TCG) || defined(CONFIG_USER_ONLY)
- #  else
++#if defined(CONFIG_USER_ONLY)
- #   define dh_alias_tl i64
+ static inline int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
-+#   define dh_typecode_tl dh_typecode_i64
+                                         int flags, CPUWatchpoint **watchpoint)
- #  endif
+ {
- # endif
+diff --git a/softmmu/watchpoint.c b/softmmu/watchpoint.c
 -# define dh_alias_env ptr
  # define dh_ctype_tl target_ulong
 +# define dh_alias_env ptr
  # define dh_ctype_env CPUArchState *
 +# define dh_typecode_env dh_typecode_ptr
  #endif
  /* We can't use glue() here because it falls foul of C preprocessor
@@ -XXX,XX +XXX,XX @@
  #define dh_typecode_i64 4
  #define dh_typecode_s64 5
  #define dh_typecode_ptr 6
 -#define dh_typecode(t) glue(dh_typecode_, dh_alias(t))
 +#define dh_typecode_int dh_typecode_s32
 +#define dh_typecode_f16 dh_typecode_i32
 +#define dh_typecode_f32 dh_typecode_i32
 +#define dh_typecode_f64 dh_typecode_i64
 +#define dh_typecode_cptr dh_typecode_ptr
 +#define dh_typecode(t) dh_typecode_##t
  #define dh_callflag_i32  0
 -#define dh_callflag_s32  0
 -#define dh_callflag_int  0
  #define dh_callflag_i64  0
 -#define dh_callflag_s64  0
 -#define dh_callflag_f16  0
 -#define dh_callflag_f32  0
 -#define dh_callflag_f64  0
  #define dh_callflag_ptr  0
 -#define dh_callflag_cptr dh_callflag_ptr
  #define dh_callflag_void 0
  #define dh_callflag_noreturn TCG_CALL_NO_RETURN
  #define dh_callflag(t) glue(dh_callflag_, dh_alias(t))
 diff --git a/target/hppa/helper.h b/target/hppa/helper.h
 index XXXXXXX..XXXXXXX 100644
---- a/target/hppa/helper.h
+--- a/softmmu/watchpoint.c
-+++ b/target/hppa/helper.h
++++ b/softmmu/watchpoint.c
-@@ -XXX,XX +XXX,XX @@
+@@ -XXX,XX +XXX,XX @@ void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
- #if TARGET_REGISTER_BITS == 64
+     }
- # define dh_alias_tr     i64
+ }
-+# define dh_typecode_tr  dh_typecode_i64
- #else
++#ifdef CONFIG_TCG
- # define dh_alias_tr     i32
++
-+# define dh_typecode_tr  dh_typecode_i32
+ /*
- #endif
+  * Return true if this watchpoint address matches the specified
- #define dh_ctype_tr      target_ureg
+  * access (ie the address range covered by the watchpoint overlaps
+@@ -XXX,XX +XXX,XX @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
-diff --git a/target/i386/ops_sse_header.h b/target/i386/ops_sse_header.h
+         }
      }
  }
 +
 +#endif /* CONFIG_TCG */
 diff --git a/softmmu/meson.build b/softmmu/meson.build
 index XXXXXXX..XXXXXXX 100644
---- a/target/i386/ops_sse_header.h
+--- a/softmmu/meson.build
-+++ b/target/i386/ops_sse_header.h
++++ b/softmmu/meson.build
-@@ -XXX,XX +XXX,XX @@
+@@ -XXX,XX +XXX,XX @@ specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: [files(
- #define dh_ctype_Reg Reg *
+   'physmem.c',
- #define dh_ctype_ZMMReg ZMMReg *
+   'qtest.c',
- #define dh_ctype_MMXReg MMXReg *
+   'dirtylimit.c',
-+#define dh_typecode_Reg dh_typecode_ptr
++  'watchpoint.c',
-+#define dh_typecode_ZMMReg dh_typecode_ptr
+ )])
-+#define dh_typecode_MMXReg dh_typecode_ptr
+ specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: [files(
- DEF_HELPER_3(glue(psrlw, SUFFIX), void, env, Reg, Reg)
+   'icount.c',
- DEF_HELPER_3(glue(psraw, SUFFIX), void, env, Reg, Reg)
+-  'watchpoint.c',
-diff --git a/target/m68k/helper.h b/target/m68k/helper.h
+ )])
-index XXXXXXX..XXXXXXX 100644
---- a/target/m68k/helper.h
+ softmmu_ss.add(files(
 +++ b/target/m68k/helper.h
@@ -XXX,XX +XXX,XX @@ DEF_HELPER_4(cas2l_parallel, void, env, i32, i32, i32)
  #define dh_alias_fp ptr
  #define dh_ctype_fp FPReg *
 +#define dh_typecode_fp dh_typecode_ptr
  DEF_HELPER_3(exts32, void, env, fp, s32)
  DEF_HELPER_3(extf32, void, env, fp, f32)
 diff --git a/target/ppc/helper.h b/target/ppc/helper.h
 index XXXXXXX..XXXXXXX 100644
 --- a/target/ppc/helper.h
 +++ b/target/ppc/helper.h
@@ -XXX,XX +XXX,XX @@ DEF_HELPER_FLAGS_1(ftsqrt, TCG_CALL_NO_RWG_SE, i32, i64)
  #define dh_alias_avr ptr
  #define dh_ctype_avr ppc_avr_t *
 +#define dh_typecode_avr dh_typecode_ptr
  #define dh_alias_vsr ptr
  #define dh_ctype_vsr ppc_vsr_t *
 +#define dh_typecode_vsr dh_typecode_ptr
  DEF_HELPER_3(vavgub, void, avr, avr, avr)
  DEF_HELPER_3(vavguh, void, avr, avr, avr)
@@ -XXX,XX +XXX,XX @@ DEF_HELPER_3(store_dbatu, void, env, i32, tl)
  #define dh_alias_fprp ptr
  #define dh_ctype_fprp ppc_fprp_t *
 +#define dh_typecode_fprp dh_typecode_ptr
  DEF_HELPER_4(DADD, void, env, fprp, fprp, fprp)
  DEF_HELPER_4(DADDQ, void, env, fprp, fprp, fprp)
 --
-.25.1
+.34.1

The following changes since commit 00483d386901173e84c7965f9f0d678791a75e01:

Merge remote-tracking branch 'remotes/shorne/tags/or1k-pull-request' into staging (2022-02-28 11:27:16 +0000)

are available in the Git repository at:

https://gitlab.com/rth7680/qemu.git tags/pull-tcg-20220228

for you to fetch changes up to 2ccf40f00e3f29d85d4ff48a9a98870059002290:

tcg/tci: Use tcg_out_ldst in tcg_out_st (2022-02-28 08:04:10 -1000)

----------------------------------------------------------------
Fix typecode generation for tcg helpers
Fix single stepping into interrupt handlers
Fix out-of-range offsets for stores in TCI

----------------------------------------------------------------
Luc Michel (1):
      accel/tcg/cpu-exec: Fix precise single-stepping after interrupt

Richard Henderson (2):
      tcg: Remove dh_alias indirection for dh_typecode
      tcg/tci: Use tcg_out_ldst in tcg_out_st

The dh_alias redirect is intended to handle TCG types as distinguished
from C types.  TCG does not distinguish signed int from unsigned int,
because they are the same size.  However, we need to retain this
distinction for dh_typecode, lest we fail to extend abi types properly
for the host call parameters.

This bug was detected when running the 'arm' emulator on an s390
system. The s390 uses TCG_TARGET_EXTEND_ARGS which triggers code
in tcg_gen_callN to extend 32 bit values to 64 bits; the incorrect
sign data in the typemask for each argument caused the values to be
extended as unsigned values.

This simple program exhibits the problem:

static volatile int num = -9;
	static volatile int den = -5;
	int main(void)
	{
		int quo = num / den;
		printf("num %d den %d quo %d\n", num, den, quo);
		exit(0);
	}

When run on the broken qemu, this results in:

num -9 den -5 quo 0

The correct result is:

num -9 den -5 quo 1

Fixes: 7319d83a735 ("tcg: Combine dh_is_64bit and dh_is_signed to dh_typecode")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/876
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reported-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Tested-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Tested-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/helper-head.h   | 19 ++++++++++---------
 target/hppa/helper.h         |  2 ++
 target/i386/ops_sse_header.h |  3 +++
 target/m68k/helper.h         |  1 +
 target/ppc/helper.h          |  3 +++
 5 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/include/exec/helper-head.h b/include/exec/helper-head.h
index XXXXXXX..XXXXXXX 100644
--- a/include/exec/helper-head.h
+++ b/include/exec/helper-head.h
@@ -XXX,XX +XXX,XX @@
 # ifdef TARGET_LONG_BITS
 #  if TARGET_LONG_BITS == 32
 #   define dh_alias_tl i32
+#   define dh_typecode_tl dh_typecode_i32
 #  else
 #   define dh_alias_tl i64
+#   define dh_typecode_tl dh_typecode_i64
 #  endif
 # endif
-# define dh_alias_env ptr
 # define dh_ctype_tl target_ulong
+# define dh_alias_env ptr
 # define dh_ctype_env CPUArchState *
+# define dh_typecode_env dh_typecode_ptr
 #endif
 
 /* We can't use glue() here because it falls foul of C preprocessor
@@ -XXX,XX +XXX,XX @@
 #define dh_typecode_i64 4
 #define dh_typecode_s64 5
 #define dh_typecode_ptr 6
-#define dh_typecode(t) glue(dh_typecode_, dh_alias(t))
+#define dh_typecode_int dh_typecode_s32
+#define dh_typecode_f16 dh_typecode_i32
+#define dh_typecode_f32 dh_typecode_i32
+#define dh_typecode_f64 dh_typecode_i64
+#define dh_typecode_cptr dh_typecode_ptr
+#define dh_typecode(t) dh_typecode_##t
 
 #define dh_callflag_i32  0
-#define dh_callflag_s32  0
-#define dh_callflag_int  0
 #define dh_callflag_i64  0
-#define dh_callflag_s64  0
-#define dh_callflag_f16  0
-#define dh_callflag_f32  0
-#define dh_callflag_f64  0
 #define dh_callflag_ptr  0
-#define dh_callflag_cptr dh_callflag_ptr
 #define dh_callflag_void 0
 #define dh_callflag_noreturn TCG_CALL_NO_RETURN
 #define dh_callflag(t) glue(dh_callflag_, dh_alias(t))
diff --git a/target/hppa/helper.h b/target/hppa/helper.h
index XXXXXXX..XXXXXXX 100644
--- a/target/hppa/helper.h
+++ b/target/hppa/helper.h
@@ -XXX,XX +XXX,XX @@
 #if TARGET_REGISTER_BITS == 64
 # define dh_alias_tr     i64
+# define dh_typecode_tr  dh_typecode_i64
 #else
 # define dh_alias_tr     i32
+# define dh_typecode_tr  dh_typecode_i32
 #endif
 #define dh_ctype_tr      target_ureg
 
diff --git a/target/i386/ops_sse_header.h b/target/i386/ops_sse_header.h
index XXXXXXX..XXXXXXX 100644
--- a/target/i386/ops_sse_header.h
+++ b/target/i386/ops_sse_header.h
@@ -XXX,XX +XXX,XX @@
 #define dh_ctype_Reg Reg *
 #define dh_ctype_ZMMReg ZMMReg *
 #define dh_ctype_MMXReg MMXReg *
+#define dh_typecode_Reg dh_typecode_ptr
+#define dh_typecode_ZMMReg dh_typecode_ptr
+#define dh_typecode_MMXReg dh_typecode_ptr
 
 DEF_HELPER_3(glue(psrlw, SUFFIX), void, env, Reg, Reg)
 DEF_HELPER_3(glue(psraw, SUFFIX), void, env, Reg, Reg)
diff --git a/target/m68k/helper.h b/target/m68k/helper.h
index XXXXXXX..XXXXXXX 100644
--- a/target/m68k/helper.h
+++ b/target/m68k/helper.h
@@ -XXX,XX +XXX,XX @@ DEF_HELPER_4(cas2l_parallel, void, env, i32, i32, i32)
 
 #define dh_alias_fp ptr
 #define dh_ctype_fp FPReg *
+#define dh_typecode_fp dh_typecode_ptr
 
 DEF_HELPER_3(exts32, void, env, fp, s32)
 DEF_HELPER_3(extf32, void, env, fp, f32)
diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index XXXXXXX..XXXXXXX 100644
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -XXX,XX +XXX,XX @@ DEF_HELPER_FLAGS_1(ftsqrt, TCG_CALL_NO_RWG_SE, i32, i64)
 
 #define dh_alias_avr ptr
 #define dh_ctype_avr ppc_avr_t *
+#define dh_typecode_avr dh_typecode_ptr
 
 #define dh_alias_vsr ptr
 #define dh_ctype_vsr ppc_vsr_t *
+#define dh_typecode_vsr dh_typecode_ptr
 
 DEF_HELPER_3(vavgub, void, avr, avr, avr)
 DEF_HELPER_3(vavguh, void, avr, avr, avr)
@@ -XXX,XX +XXX,XX @@ DEF_HELPER_3(store_dbatu, void, env, i32, tl)
 
 #define dh_alias_fprp ptr
 #define dh_ctype_fprp ppc_fprp_t *
+#define dh_typecode_fprp dh_typecode_ptr
 
 DEF_HELPER_4(DADD, void, env, fprp, fprp, fprp)
 DEF_HELPER_4(DADDQ, void, env, fprp, fprp, fprp)
-- 
2.25.1

From: Luc Michel <lmichel@kalray.eu>

In some cases, cpu->exit_request can be false after handling the
interrupt, leading to another TB being executed instead of returning
to the main loop.

Fix this by returning true unconditionally when in single-step mode.

Fixes: ba3c35d9c402 ("tcg/cpu-exec: precise single-stepping after an interrupt")
Signed-off-by: Luc Michel <lmichel@kalray.eu>
Message-Id: <20220214132656.11397-1-lmichel@kalray.eu>
[rth: Unlock iothread mutex; simplify indentation]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/cpu-exec.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -XXX,XX +XXX,XX @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
                  * raised when single-stepping so that GDB doesn't miss the
                  * next instruction.
                  */
-                cpu->exception_index =
-                    (cpu->singlestep_enabled ? EXCP_DEBUG : -1);
+                if (unlikely(cpu->singlestep_enabled)) {
+                    cpu->exception_index = EXCP_DEBUG;
+                    qemu_mutex_unlock_iothread();
+                    return true;
+                }
+                cpu->exception_index = -1;
                 *last_tb = NULL;
             }
             /* The target hook may have updated the 'cpu->interrupt_request';
-- 
2.25.1

The tcg_out_ldst helper will handle out-of-range offsets.
We haven't actually encountered any, since we haven't run
across the assert within tcg_out_op_rrs, but an out-of-range
offset would not be impossible in future.

Fixes: 65089889183 ("tcg/tci: Change encoding to uint32_t units")
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/tci/tcg-target.c.inc | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tcg/tci/tcg-target.c.inc b/tcg/tci/tcg-target.c.inc
index XXXXXXX..XXXXXXX 100644
--- a/tcg/tci/tcg-target.c.inc
+++ b/tcg/tci/tcg-target.c.inc
@@ -XXX,XX +XXX,XX @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
 static void tcg_out_st(TCGContext *s, TCGType type, TCGReg val, TCGReg base,
                        intptr_t offset)
 {
-    stack_bounds_check(base, offset);
     switch (type) {
     case TCG_TYPE_I32:
-        tcg_out_op_rrs(s, INDEX_op_st_i32, val, base, offset);
+        tcg_out_ldst(s, INDEX_op_st_i32, val, base, offset);
         break;
 #if TCG_TARGET_REG_BITS == 64
     case TCG_TYPE_I64:
-        tcg_out_op_rrs(s, INDEX_op_st_i64, val, base, offset);
+        tcg_out_ldst(s, INDEX_op_st_i64, val, base, offset);
         break;
 #endif
     default:
-- 
2.25.1

The following changes since commit d37158bb2425e7ebffb167d611be01f1e9e6c86f:

Update version for v8.0.0-rc2 release (2023-03-28 20:43:21 +0100)

are available in the Git repository at:

https://gitlab.com/rth7680/qemu.git tags/pull-tcg-20230328

for you to fetch changes up to 87e303de70f93bf700f58412fb9b2c3ec918c4b5:

softmmu: Restore use of CPU watchpoint for all accelerators (2023-03-28 15:24:06 -0700)

----------------------------------------------------------------
Use a local version of GTree [#285]
Fix page_set_flags vs the last page of the address space [#1528]
Re-enable gdbstub breakpoints under KVM

----------------------------------------------------------------
Emilio Cota (2):
      util: import GTree as QTree
      tcg: use QTree instead of GTree

Philippe Mathieu-Daudé (3):
      softmmu: Restrict cpu_check_watchpoint / address_matches to TCG accel
      softmmu/watchpoint: Add missing 'qemu/error-report.h' include
      softmmu: Restore use of CPU watchpoint for all accelerators

Richard Henderson (10):
      linux-user: Diagnose misaligned -R size
      accel/tcg: Pass last not end to page_set_flags
      accel/tcg: Pass last not end to page_reset_target_data
      accel/tcg: Pass last not end to PAGE_FOR_EACH_TB
      accel/tcg: Pass last not end to page_collection_lock
      accel/tcg: Pass last not end to tb_invalidate_phys_page_range__locked
      accel/tcg: Pass last not end to tb_invalidate_phys_range
      linux-user: Pass last not end to probe_guest_base
      include/exec: Change reserved_va semantics to last byte
      linux-user/arm: Take more care allocating commpage

From: Emilio Cota <cota@braap.org>

The only reason to add this implementation is to control the memory allocator
used. Some users (e.g. TCG) cannot work reliably in multi-threaded
environments (e.g. forking in user-mode) with GTree's allocator, GSlice.
See https://gitlab.com/qemu-project/qemu/-/issues/285 for details.

Importing GTree is a temporary workaround until GTree migrates away
from GSlice.

This implementation is identical to that in glib v2.75.0, except that
we don't import recent additions to the API nor deprecated API calls,
none of which are used in QEMU.

I've imported tests from glib and added a benchmark just to
make sure that performance is similar. Note: it cannot be identical
because (1) we are not using GSlice, (2) we use different compilation flags
(e.g. -fPIC) and (3) we're linking statically.

$ cat /proc/cpuinfo| grep 'model name' | head -1
model name      : AMD Ryzen 7 PRO 5850U with Radeon Graphics
$ echo '0' | sudo tee /sys/devices/system/cpu/cpufreq/boost
$ tests/bench/qtree-bench

Tree         Op      32            1024            4096          131072         1048576
------------------------------------------------------------------------------------------------
GTree     Lookup   83.23           43.08           25.31           19.40           16.22
QTree     Lookup  113.42 (1.36x)   53.83 (1.25x)   28.38 (1.12x)   17.64 (0.91x)   13.04 (0.80x)
GTree     Insert   44.23           29.37           25.83           19.49           17.03
QTree     Insert   46.87 (1.06x)   25.62 (0.87x)   24.29 (0.94x)   16.83 (0.86x)   12.97 (0.76x)
GTree     Remove   53.27           35.15           31.43           24.64           16.70
QTree     Remove   57.32 (1.08x)   41.76 (1.19x)   38.37 (1.22x)   29.30 (1.19x)   15.07 (0.90x)
GTree  RemoveAll  135.44          127.52          126.72          120.11           64.34
QTree  RemoveAll  127.15 (0.94x)  110.37 (0.87x)  107.97 (0.85x)   97.13 (0.81x)   55.10 (0.86x)
GTree   Traverse  277.71          276.09          272.78          246.72           98.47
QTree   Traverse  370.33 (1.33x)  411.97 (1.49x)  400.23 (1.47x)  262.82 (1.07x)   78.52 (0.80x)
------------------------------------------------------------------------------------------------

As a sanity check, the same benchmark when Glib's version
is >= $glib_dropped_gslice_version (i.e. QTree == GTree):

Tree         Op      32            1024            4096          131072         1048576
------------------------------------------------------------------------------------------------
GTree     Lookup   82.72           43.09           24.18           19.73           16.09
QTree     Lookup   81.82 (0.99x)   43.10 (1.00x)   24.20 (1.00x)   19.76 (1.00x)   16.26 (1.01x)
GTree     Insert   45.07           29.62           26.34           19.90           17.18
QTree     Insert   45.72 (1.01x)   29.60 (1.00x)   26.38 (1.00x)   19.71 (0.99x)   17.20 (1.00x)
GTree     Remove   54.48           35.36           31.77           24.97           16.95
QTree     Remove   54.46 (1.00x)   35.32 (1.00x)   31.77 (1.00x)   24.91 (1.00x)   17.15 (1.01x)
GTree  RemoveAll  140.68          127.36          125.43          121.45           68.20
QTree  RemoveAll  140.65 (1.00x)  127.64 (1.00x)  125.01 (1.00x)  121.73 (1.00x)   67.06 (0.98x)
GTree   Traverse  278.68          276.05          266.75          251.65          104.93
QTree   Traverse  278.31 (1.00x)  275.78 (1.00x)  266.42 (1.00x)  247.89 (0.99x)  104.58 (1.00x)
------------------------------------------------------------------------------------------------

Signed-off-by: Emilio Cota <cota@braap.org>
Message-Id: <20230205163758.416992-2-cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 configure                 |   15 +
 meson.build               |    4 +
 include/qemu/qtree.h      |  201 ++++++
 tests/bench/qtree-bench.c |  286 ++++++++
 tests/unit/test-qtree.c   |  333 +++++++++
 util/qtree.c              | 1390 +++++++++++++++++++++++++++++++++++++
 tests/bench/meson.build   |    4 +
 tests/unit/meson.build    |    1 +
 util/meson.build          |    1 +
 9 files changed, 2235 insertions(+)
 create mode 100644 include/qemu/qtree.h
 create mode 100644 tests/bench/qtree-bench.c
 create mode 100644 tests/unit/test-qtree.c
 create mode 100644 util/qtree.c

diff --git a/configure b/configure
index XXXXXXX..XXXXXXX 100755
--- a/configure
+++ b/configure
@@ -XXX,XX +XXX,XX @@ safe_stack=""
 use_containers="yes"
 gdb_bin=$(command -v "gdb-multiarch" || command -v "gdb")
 gdb_arches=""
+glib_has_gslice="no"
 
 if test -e "$source_path/.git"
 then
@@ -XXX,XX +XXX,XX @@ for i in $glib_modules; do
     fi
 done
 
+# Check whether glib has gslice, which we have to avoid for correctness.
+# TODO: remove this check and the corresponding workaround (qtree) when
+# the minimum supported glib is >= $glib_dropped_gslice_version.
+glib_dropped_gslice_version=2.75.3
+for i in $glib_modules; do
+    if ! $pkg_config --atleast-version=$glib_dropped_gslice_version $i; then
+        glib_has_gslice="yes"
+	break
+    fi
+done
+
 glib_bindir="$($pkg_config --variable=bindir glib-2.0)"
 if test -z "$glib_bindir" ; then
 	glib_bindir="$($pkg_config --variable=prefix glib-2.0)"/bin
@@ -XXX,XX +XXX,XX @@ echo "GLIB_CFLAGS=$glib_cflags" >> $config_host_mak
 echo "GLIB_LIBS=$glib_libs" >> $config_host_mak
 echo "GLIB_BINDIR=$glib_bindir" >> $config_host_mak
 echo "GLIB_VERSION=$($pkg_config --modversion glib-2.0)" >> $config_host_mak
+if test "$glib_has_gslice" = "yes" ; then
+    echo "HAVE_GLIB_WITH_SLICE_ALLOCATOR=y" >> $config_host_mak
+fi
 echo "QEMU_LDFLAGS=$QEMU_LDFLAGS" >> $config_host_mak
 echo "EXESUF=$EXESUF" >> $config_host_mak
 
diff --git a/meson.build b/meson.build
index XXXXXXX..XXXXXXX 100644
--- a/meson.build
+++ b/meson.build
@@ -XXX,XX +XXX,XX @@ glib = declare_dependency(compile_args: config_host['GLIB_CFLAGS'].split(),
                           })
 # override glib dep with the configure results (for subprojects)
 meson.override_dependency('glib-2.0', glib)
+# pass down whether Glib has the slice allocator
+if config_host.has_key('HAVE_GLIB_WITH_SLICE_ALLOCATOR')
+  config_host_data.set('HAVE_GLIB_WITH_SLICE_ALLOCATOR', true)
+endif
 
 gio = not_found
 gdbus_codegen = not_found
diff --git a/include/qemu/qtree.h b/include/qemu/qtree.h
new file mode 100644
index XXXXXXX..XXXXXXX
--- /dev/null
+++ b/include/qemu/qtree.h
@@ -XXX,XX +XXX,XX @@
+/*
+ * GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
+ * file for a list of people on the GLib Team.  See the ChangeLog
+ * files for a list of changes.  These files are distributed with
+ * GLib at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+/*
+ * QTree is a partial import of Glib's GTree. The parts excluded correspond
+ * to API calls either deprecated (e.g. g_tree_traverse) or recently added
+ * (e.g. g_tree_search_node, added in 2.68); neither have callers in QEMU.
+ *
+ * The reason for this import is to allow us to control the memory allocator
+ * used by the tree implementation. Until Glib 2.75.3, GTree uses Glib's
+ * slice allocator, which causes problems when forking in user-mode;
+ * see https://gitlab.com/qemu-project/qemu/-/issues/285 and glib's
+ * "45b5a6c1e gslice: Remove slice allocator and use malloc() instead".
+ *
+ * TODO: remove QTree when QEMU's minimum Glib version is >= 2.75.3.
+ */
+
+#ifndef QEMU_QTREE_H
+#define QEMU_QTREE_H
+
+#include "qemu/osdep.h"
+
+#ifdef HAVE_GLIB_WITH_SLICE_ALLOCATOR
+
+typedef struct _QTree  QTree;
+
+typedef struct _QTreeNode QTreeNode;
+
+typedef gboolean (*QTraverseNodeFunc)(QTreeNode *node,
+                                      gpointer user_data);
+
+/*
+ * Balanced binary trees
+ */
+QTree *q_tree_new(GCompareFunc key_compare_func);
+QTree *q_tree_new_with_data(GCompareDataFunc key_compare_func,
+                            gpointer key_compare_data);
+QTree *q_tree_new_full(GCompareDataFunc key_compare_func,
+                       gpointer key_compare_data,
+                       GDestroyNotify key_destroy_func,
+                       GDestroyNotify value_destroy_func);
+QTree *q_tree_ref(QTree *tree);
+void q_tree_unref(QTree *tree);
+void q_tree_destroy(QTree *tree);
+void q_tree_insert(QTree *tree,
+                   gpointer key,
+                   gpointer value);
+void q_tree_replace(QTree *tree,
+                    gpointer key,
+                    gpointer value);
+gboolean q_tree_remove(QTree *tree,
+                       gconstpointer key);
+gboolean q_tree_steal(QTree *tree,
+                      gconstpointer key);
+gpointer q_tree_lookup(QTree *tree,
+                       gconstpointer key);
+gboolean q_tree_lookup_extended(QTree *tree,
+                                gconstpointer lookup_key,
+                                gpointer *orig_key,
+                                gpointer *value);
+void q_tree_foreach(QTree *tree,
+                    GTraverseFunc func,
+                    gpointer user_data);
+gpointer q_tree_search(QTree *tree,
+                       GCompareFunc search_func,
+                       gconstpointer user_data);
+gint q_tree_height(QTree *tree);
+gint q_tree_nnodes(QTree *tree);
+
+#else /* !HAVE_GLIB_WITH_SLICE_ALLOCATOR */
+
+typedef GTree QTree;
+typedef GTreeNode QTreeNode;
+typedef GTraverseNodeFunc QTraverseNodeFunc;
+
+static inline QTree *q_tree_new(GCompareFunc key_compare_func)
+{
+    return g_tree_new(key_compare_func);
+}
+
+static inline QTree *q_tree_new_with_data(GCompareDataFunc key_compare_func,
+                                          gpointer key_compare_data)
+{
+    return g_tree_new_with_data(key_compare_func, key_compare_data);
+}
+
+static inline QTree *q_tree_new_full(GCompareDataFunc key_compare_func,
+                                     gpointer key_compare_data,
+                                     GDestroyNotify key_destroy_func,
+                                     GDestroyNotify value_destroy_func)
+{
+    return g_tree_new_full(key_compare_func, key_compare_data,
+                           key_destroy_func, value_destroy_func);
+}
+
+static inline QTree *q_tree_ref(QTree *tree)
+{
+    return g_tree_ref(tree);
+}
+
+static inline void q_tree_unref(QTree *tree)
+{
+    g_tree_unref(tree);
+}
+
+static inline void q_tree_destroy(QTree *tree)
+{
+    g_tree_destroy(tree);
+}
+
+static inline void q_tree_insert(QTree *tree,
+                                 gpointer key,
+                                 gpointer value)
+{
+    g_tree_insert(tree, key, value);
+}
+
+static inline void q_tree_replace(QTree *tree,
+                                  gpointer key,
+                                  gpointer value)
+{
+    g_tree_replace(tree, key, value);
+}
+
+static inline gboolean q_tree_remove(QTree *tree,
+                                     gconstpointer key)
+{
+    return g_tree_remove(tree, key);
+}
+
+static inline gboolean q_tree_steal(QTree *tree,
+                                    gconstpointer key)
+{
+    return g_tree_steal(tree, key);
+}
+
+static inline gpointer q_tree_lookup(QTree *tree,
+                                     gconstpointer key)
+{
+    return g_tree_lookup(tree, key);
+}
+
+static inline gboolean q_tree_lookup_extended(QTree *tree,
+                                              gconstpointer lookup_key,
+                                              gpointer *orig_key,
+                                              gpointer *value)
+{
+    return g_tree_lookup_extended(tree, lookup_key, orig_key, value);
+}
+
+static inline void q_tree_foreach(QTree *tree,
+                                  GTraverseFunc func,
+                                  gpointer user_data)
+{
+    return g_tree_foreach(tree, func, user_data);
+}
+
+static inline gpointer q_tree_search(QTree *tree,
+                                     GCompareFunc search_func,
+                                     gconstpointer user_data)
+{
+    return g_tree_search(tree, search_func, user_data);
+}
+
+static inline gint q_tree_height(QTree *tree)
+{
+    return g_tree_height(tree);
+}
+
+static inline gint q_tree_nnodes(QTree *tree)
+{
+    return g_tree_nnodes(tree);
+}
+
+#endif /* HAVE_GLIB_WITH_SLICE_ALLOCATOR */
+
+#endif /* QEMU_QTREE_H */
diff --git a/tests/bench/qtree-bench.c b/tests/bench/qtree-bench.c
new file mode 100644
index XXXXXXX..XXXXXXX
--- /dev/null
+++ b/tests/bench/qtree-bench.c
@@ -XXX,XX +XXX,XX @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include "qemu/osdep.h"
+#include "qemu/qtree.h"
+#include "qemu/timer.h"
+
+enum tree_op {
+    OP_LOOKUP,
+    OP_INSERT,
+    OP_REMOVE,
+    OP_REMOVE_ALL,
+    OP_TRAVERSE,
+};
+
+struct benchmark {
+    const char * const name;
+    enum tree_op op;
+    bool fill_on_init;
+};
+
+enum impl_type {
+    IMPL_GTREE,
+    IMPL_QTREE,
+};
+
+struct tree_implementation {
+    const char * const name;
+    enum impl_type type;
+};
+
+static const struct benchmark benchmarks[] = {
+    {
+        .name = "Lookup",
+        .op = OP_LOOKUP,
+        .fill_on_init = true,
+    },
+    {
+        .name = "Insert",
+        .op = OP_INSERT,
+        .fill_on_init = false,
+    },
+    {
+        .name = "Remove",
+        .op = OP_REMOVE,
+        .fill_on_init = true,
+    },
+    {
+        .name = "RemoveAll",
+        .op = OP_REMOVE_ALL,
+        .fill_on_init = true,
+    },
+    {
+        .name = "Traverse",
+        .op = OP_TRAVERSE,
+        .fill_on_init = true,
+    },
+};
+
+static const struct tree_implementation impls[] = {
+    {
+        .name = "GTree",
+        .type = IMPL_GTREE,
+    },
+    {
+        .name = "QTree",
+        .type = IMPL_QTREE,
+    },
+};
+
+static int compare_func(const void *ap, const void *bp)
+{
+    const size_t *a = ap;
+    const size_t *b = bp;
+
+    return *a - *b;
+}
+
+static void init_empty_tree_and_keys(enum impl_type impl,
+                                     void **ret_tree, size_t **ret_keys,
+                                     size_t n_elems)
+{
+    size_t *keys = g_malloc_n(n_elems, sizeof(*keys));
+    for (size_t i = 0; i < n_elems; i++) {
+        keys[i] = i;
+    }
+
+    void *tree;
+    switch (impl) {
+    case IMPL_GTREE:
+        tree = g_tree_new(compare_func);
+        break;
+    case IMPL_QTREE:
+        tree = q_tree_new(compare_func);
+        break;
+    default:
+        g_assert_not_reached();
+    }
+
+    *ret_tree = tree;
+    *ret_keys = keys;
+}
+
+static gboolean traverse_func(gpointer key, gpointer value, gpointer data)
+{
+    return FALSE;
+}
+
+static inline void remove_all(void *tree, enum impl_type impl)
+{
+    switch (impl) {
+    case IMPL_GTREE:
+        g_tree_destroy(tree);
+        break;
+    case IMPL_QTREE:
+        q_tree_destroy(tree);
+        break;
+    default:
+        g_assert_not_reached();
+    }
+}
+
+static int64_t run_benchmark(const struct benchmark *bench,
+                             enum impl_type impl,
+                             size_t n_elems)
+{
+    void *tree;
+    size_t *keys;
+
+    init_empty_tree_and_keys(impl, &tree, &keys, n_elems);
+    if (bench->fill_on_init) {
+        for (size_t i = 0; i < n_elems; i++) {
+            switch (impl) {
+            case IMPL_GTREE:
+                g_tree_insert(tree, &keys[i], &keys[i]);
+                break;
+            case IMPL_QTREE:
+                q_tree_insert(tree, &keys[i], &keys[i]);
+                break;
+            default:
+                g_assert_not_reached();
+            }
+        }
+    }
+
+    int64_t start_ns = get_clock();
+    switch (bench->op) {
+    case OP_LOOKUP:
+        for (size_t i = 0; i < n_elems; i++) {
+            void *value;
+            switch (impl) {
+            case IMPL_GTREE:
+                value = g_tree_lookup(tree, &keys[i]);
+                break;
+            case IMPL_QTREE:
+                value = q_tree_lookup(tree, &keys[i]);
+                break;
+            default:
+                g_assert_not_reached();
+            }
+            (void)value;
+        }
+        break;
+    case OP_INSERT:
+        for (size_t i = 0; i < n_elems; i++) {
+            switch (impl) {
+            case IMPL_GTREE:
+                g_tree_insert(tree, &keys[i], &keys[i]);
+                break;
+            case IMPL_QTREE:
+                q_tree_insert(tree, &keys[i], &keys[i]);
+                break;
+            default:
+                g_assert_not_reached();
+            }
+        }
+        break;
+    case OP_REMOVE:
+        for (size_t i = 0; i < n_elems; i++) {
+            switch (impl) {
+            case IMPL_GTREE:
+                g_tree_remove(tree, &keys[i]);
+                break;
+            case IMPL_QTREE:
+                q_tree_remove(tree, &keys[i]);
+                break;
+            default:
+                g_assert_not_reached();
+            }
+        }
+        break;
+    case OP_REMOVE_ALL:
+        remove_all(tree, impl);
+        break;
+    case OP_TRAVERSE:
+        switch (impl) {
+        case IMPL_GTREE:
+            g_tree_foreach(tree, traverse_func, NULL);
+            break;
+        case IMPL_QTREE:
+            q_tree_foreach(tree, traverse_func, NULL);
+            break;
+        default:
+            g_assert_not_reached();
+        }
+        break;
+    default:
+        g_assert_not_reached();
+    }
+    int64_t ns = get_clock() - start_ns;
+
+    if (bench->op != OP_REMOVE_ALL) {
+        remove_all(tree, impl);
+    }
+    g_free(keys);
+
+    return ns;
+}
+
+int main(int argc, char *argv[])
+{
+    size_t sizes[] = {
+        32,
+        1024,
+        1024 * 4,
+        1024 * 128,
+        1024 * 1024,
+    };
+
+    double res[ARRAY_SIZE(benchmarks)][ARRAY_SIZE(impls)][ARRAY_SIZE(sizes)];
+    for (int i = 0; i < ARRAY_SIZE(sizes); i++) {
+        size_t size = sizes[i];
+        for (int j = 0; j < ARRAY_SIZE(impls); j++) {
+            const struct tree_implementation *impl = &impls[j];
+            for (int k = 0; k < ARRAY_SIZE(benchmarks); k++) {
+                const struct benchmark *bench = &benchmarks[k];
+
+                /* warm-up run */
+                run_benchmark(bench, impl->type, size);
+
+                int64_t total_ns = 0;
+                int64_t n_runs = 0;
+                while (total_ns < 2e8 || n_runs < 5) {
+                    total_ns += run_benchmark(bench, impl->type, size);
+                    n_runs++;
+                }
+                double ns_per_run = (double)total_ns / n_runs;
+
+                /* Throughput, in Mops/s */
+                res[k][j][i] = size / ns_per_run * 1e3;
+            }
+        }
+    }
+
+    printf("# Results' breakdown: Tree, Op and #Elements. Units: Mops/s\n");
+    printf("%5s %10s ", "Tree", "Op");
+    for (int i = 0; i < ARRAY_SIZE(sizes); i++) {
+        printf("%7zu         ", sizes[i]);
+    }
+    printf("\n");
+    char separator[97];
+    for (int i = 0; i < ARRAY_SIZE(separator) - 1; i++) {
+        separator[i] = '-';
+    }
+    separator[ARRAY_SIZE(separator) - 1] = '\0';
+    printf("%s\n", separator);
+    for (int i = 0; i < ARRAY_SIZE(benchmarks); i++) {
+        for (int j = 0; j < ARRAY_SIZE(impls); j++) {
+            printf("%5s %10s ", impls[j].name, benchmarks[i].name);
+            for (int k = 0; k < ARRAY_SIZE(sizes); k++) {
+                printf("%7.2f ", res[i][j][k]);
+                if (j == 0) {
+                    printf("        ");
+                } else {
+                    if (res[i][0][k] != 0) {
+                        double speedup = res[i][j][k] / res[i][0][k];
+                        printf("(%4.2fx) ", speedup);
+                    } else {
+                        printf("(     ) ");
+                    }
+                }
+            }
+            printf("\n");
+        }
+    }
+    printf("%s\n", separator);
+    return 0;
+}
diff --git a/tests/unit/test-qtree.c b/tests/unit/test-qtree.c
new file mode 100644
index XXXXXXX..XXXXXXX
--- /dev/null
+++ b/tests/unit/test-qtree.c
@@ -XXX,XX +XXX,XX @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Tests for QTree.
+ * Original source: glib
+ *   https://gitlab.gnome.org/GNOME/glib/-/blob/main/glib/tests/tree.c
+ *   LGPL license.
+ *   Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/qtree.h"
+
+static gint my_compare(gconstpointer a, gconstpointer b)
+{
+    const char *cha = a;
+    const char *chb = b;
+
+    return *cha - *chb;
+}
+
+static gint my_compare_with_data(gconstpointer a,
+                                 gconstpointer b,
+                                 gpointer user_data)
+{
+    const char *cha = a;
+    const char *chb = b;
+
+    /* just check that we got the right data */
+    g_assert(GPOINTER_TO_INT(user_data) == 123);
+
+    return *cha - *chb;
+}
+
+static gint my_search(gconstpointer a, gconstpointer b)
+{
+    return my_compare(b, a);
+}
+
+static gpointer destroyed_key;
+static gpointer destroyed_value;
+static guint destroyed_key_count;
+static guint destroyed_value_count;
+
+static void my_key_destroy(gpointer key)
+{
+    destroyed_key = key;
+    destroyed_key_count++;
+}
+
+static void my_value_destroy(gpointer value)
+{
+    destroyed_value = value;
+    destroyed_value_count++;
+}
+
+static gint my_traverse(gpointer key, gpointer value, gpointer data)
+{
+    char *ch = key;
+
+    g_assert((*ch) > 0);
+
+    if (*ch == 'd') {
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+char chars[] =
+    "0123456789"
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    "abcdefghijklmnopqrstuvwxyz";
+
+char chars2[] =
+    "0123456789"
+    "abcdefghijklmnopqrstuvwxyz";
+
+static gint check_order(gpointer key, gpointer value, gpointer data)
+{
+    char **p = data;
+    char *ch = key;
+
+    g_assert(**p == *ch);
+
+    (*p)++;
+
+    return FALSE;
+}
+
+static void test_tree_search(void)
+{
+    gint i;
+    QTree *tree;
+    gboolean removed;
+    gchar c;
+    gchar *p, *d;
+
+    tree = q_tree_new_with_data(my_compare_with_data, GINT_TO_POINTER(123));
+
+    for (i = 0; chars[i]; i++) {
+        q_tree_insert(tree, &chars[i], &chars[i]);
+    }
+
+    q_tree_foreach(tree, my_traverse, NULL);
+
+    g_assert(q_tree_nnodes(tree) == strlen(chars));
+    g_assert(q_tree_height(tree) == 6);
+
+    p = chars;
+    q_tree_foreach(tree, check_order, &p);
+
+    for (i = 0; i < 26; i++) {
+        removed = q_tree_remove(tree, &chars[i + 10]);
+        g_assert(removed);
+    }
+
+    c = '\0';
+    removed = q_tree_remove(tree, &c);
+    g_assert(!removed);
+
+    q_tree_foreach(tree, my_traverse, NULL);
+
+    g_assert(q_tree_nnodes(tree) == strlen(chars2));
+    g_assert(q_tree_height(tree) == 6);
+
+    p = chars2;
+    q_tree_foreach(tree, check_order, &p);
+
+    for (i = 25; i >= 0; i--) {
+        q_tree_insert(tree, &chars[i + 10], &chars[i + 10]);
+    }
+
+    p = chars;
+    q_tree_foreach(tree, check_order, &p);
+
+    c = '0';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p && *p == c);
+    g_assert(q_tree_lookup_extended(tree, &c, (gpointer *)&d, (gpointer *)&p));
+    g_assert(c == *d && c == *p);
+
+    c = 'A';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p && *p == c);
+
+    c = 'a';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p && *p == c);
+
+    c = 'z';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p && *p == c);
+
+    c = '!';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p == NULL);
+
+    c = '=';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p == NULL);
+
+    c = '|';
+    p = q_tree_lookup(tree, &c);
+    g_assert(p == NULL);
+
+    c = '0';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p && *p == c);
+
+    c = 'A';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p && *p == c);
+
+    c = 'a';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p && *p == c);
+
+    c = 'z';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p && *p == c);
+
+    c = '!';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p == NULL);
+
+    c = '=';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p == NULL);
+
+    c = '|';
+    p = q_tree_search(tree, my_search, &c);
+    g_assert(p == NULL);
+
+    q_tree_destroy(tree);
+}
+
+static void test_tree_remove(void)
+{
+    QTree *tree;
+    char c, d;
+    gint i;
+    gboolean removed;
+
+    tree = q_tree_new_full((GCompareDataFunc)my_compare, NULL,
+                           my_key_destroy,
+                           my_value_destroy);
+
+    for (i = 0; chars[i]; i++) {
+        q_tree_insert(tree, &chars[i], &chars[i]);
+    }
+
+    c = '0';
+    q_tree_insert(tree, &c, &c);
+    g_assert(destroyed_key == &c);
+    g_assert(destroyed_value == &chars[0]);
+    destroyed_key = NULL;
+    destroyed_value = NULL;
+
+    d = '1';
+    q_tree_replace(tree, &d, &d);
+    g_assert(destroyed_key == &chars[1]);
+    g_assert(destroyed_value == &chars[1]);
+    destroyed_key = NULL;
+    destroyed_value = NULL;
+
+    c = '2';
+    removed = q_tree_remove(tree, &c);
+    g_assert(removed);
+    g_assert(destroyed_key == &chars[2]);
+    g_assert(destroyed_value == &chars[2]);
+    destroyed_key = NULL;
+    destroyed_value = NULL;
+
+    c = '3';
+    removed = q_tree_steal(tree, &c);
+    g_assert(removed);
+    g_assert(destroyed_key == NULL);
+    g_assert(destroyed_value == NULL);
+
+    const gchar *remove = "omkjigfedba";
+    for (i = 0; remove[i]; i++) {
+        removed = q_tree_remove(tree, &remove[i]);
+        g_assert(removed);
+    }
+
+    q_tree_destroy(tree);
+}
+
+static void test_tree_destroy(void)
+{
+    QTree *tree;
+    gint i;
+
+    tree = q_tree_new(my_compare);
+
+    for (i = 0; chars[i]; i++) {
+        q_tree_insert(tree, &chars[i], &chars[i]);
+    }
+
+    g_assert(q_tree_nnodes(tree) == strlen(chars));
+
+    g_test_message("nnodes: %d", q_tree_nnodes(tree));
+    q_tree_ref(tree);
+    q_tree_destroy(tree);
+
+    g_test_message("nnodes: %d", q_tree_nnodes(tree));
+    g_assert(q_tree_nnodes(tree) == 0);
+
+    q_tree_unref(tree);
+}
+
+static void test_tree_insert(void)
+{
+    QTree *tree;
+    gchar *p;
+    gint i;
+    gchar *scrambled;
+
+    tree = q_tree_new(my_compare);
+
+    for (i = 0; chars[i]; i++) {
+        q_tree_insert(tree, &chars[i], &chars[i]);
+    }
+    p = chars;
+    q_tree_foreach(tree, check_order, &p);
+
+    q_tree_unref(tree);
+    tree = q_tree_new(my_compare);
+
+    for (i = strlen(chars) - 1; i >= 0; i--) {
+        q_tree_insert(tree, &chars[i], &chars[i]);
+    }
+    p = chars;
+    q_tree_foreach(tree, check_order, &p);
+
+    q_tree_unref(tree);
+    tree = q_tree_new(my_compare);
+
+    scrambled = g_strdup(chars);
+
+    for (i = 0; i < 30; i++) {
+        gchar tmp;
+        gint a, b;
+
+        a = g_random_int_range(0, strlen(scrambled));
+        b = g_random_int_range(0, strlen(scrambled));
+        tmp = scrambled[a];
+        scrambled[a] = scrambled[b];
+        scrambled[b] = tmp;
+    }
+
+    for (i = 0; scrambled[i]; i++) {
+        q_tree_insert(tree, &scrambled[i], &scrambled[i]);
+    }
+    p = chars;
+    q_tree_foreach(tree, check_order, &p);
+
+    g_free(scrambled);
+    q_tree_unref(tree);
+}
+
+int main(int argc, char *argv[])
+{
+    g_test_init(&argc, &argv, NULL);
+
+    g_test_add_func("/qtree/search", test_tree_search);
+    g_test_add_func("/qtree/remove", test_tree_remove);
+    g_test_add_func("/qtree/destroy", test_tree_destroy);
+    g_test_add_func("/qtree/insert", test_tree_insert);
+
+    return g_test_run();
+}
diff --git a/util/qtree.c b/util/qtree.c
new file mode 100644
index XXXXXXX..XXXXXXX
--- /dev/null
+++ b/util/qtree.c
@@ -XXX,XX +XXX,XX @@
+/*
+ * GLIB - Library of useful routines for C programming
+ * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
+ * file for a list of people on the GLib Team.  See the ChangeLog
+ * files for a list of changes.  These files are distributed with
+ * GLib at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+/*
+ * MT safe
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/qtree.h"
+
+/**
+ * SECTION:trees-binary
+ * @title: Balanced Binary Trees
+ * @short_description: a sorted collection of key/value pairs optimized
+ *                     for searching and traversing in order
+ *
+ * The #QTree structure and its associated functions provide a sorted
+ * collection of key/value pairs optimized for searching and traversing
+ * in order. This means that most of the operations  (access, search,
+ * insertion, deletion, ...) on #QTree are O(log(n)) in average and O(n)
+ * in worst case for time complexity. But, note that maintaining a
+ * balanced sorted #QTree of n elements is done in time O(n log(n)).
+ *
+ * To create a new #QTree use q_tree_new().
+ *
+ * To insert a key/value pair into a #QTree use q_tree_insert()
+ * (O(n log(n))).
+ *
+ * To remove a key/value pair use q_tree_remove() (O(n log(n))).
+ *
+ * To look up the value corresponding to a given key, use
+ * q_tree_lookup() and q_tree_lookup_extended().
+ *
+ * To find out the number of nodes in a #QTree, use q_tree_nnodes(). To
+ * get the height of a #QTree, use q_tree_height().
+ *
+ * To traverse a #QTree, calling a function for each node visited in
+ * the traversal, use q_tree_foreach().
+ *
+ * To destroy a #QTree, use q_tree_destroy().
+ **/
+
+#define MAX_GTREE_HEIGHT 40
+
+/**
+ * QTree:
+ *
+ * The QTree struct is an opaque data structure representing a
+ * [balanced binary tree][glib-Balanced-Binary-Trees]. It should be
+ * accessed only by using the following functions.
+ */
+struct _QTree {
+    QTreeNode        *root;
+    GCompareDataFunc  key_compare;
+    GDestroyNotify    key_destroy_func;
+    GDestroyNotify    value_destroy_func;
+    gpointer          key_compare_data;
+    guint             nnodes;
+    gint              ref_count;
+};
+
+struct _QTreeNode {
+    gpointer   key;         /* key for this node */
+    gpointer   value;       /* value stored at this node */
+    QTreeNode *left;        /* left subtree */
+    QTreeNode *right;       /* right subtree */
+    gint8      balance;     /* height (right) - height (left) */
+    guint8     left_child;
+    guint8     right_child;
+};
+
+
+static QTreeNode *q_tree_node_new(gpointer       key,
+                                  gpointer       value);
+static QTreeNode *q_tree_insert_internal(QTree *tree,
+                                         gpointer key,
+                                         gpointer value,
+                                         gboolean replace);
+static gboolean   q_tree_remove_internal(QTree         *tree,
+                                         gconstpointer  key,
+                                         gboolean       steal);
+static QTreeNode *q_tree_node_balance(QTreeNode     *node);
+static QTreeNode *q_tree_find_node(QTree         *tree,
+                                   gconstpointer  key);
+static QTreeNode *q_tree_node_search(QTreeNode *node,
+                                     GCompareFunc search_func,
+                                     gconstpointer data);
+static QTreeNode *q_tree_node_rotate_left(QTreeNode     *node);
+static QTreeNode *q_tree_node_rotate_right(QTreeNode     *node);
+#ifdef Q_TREE_DEBUG
+static void       q_tree_node_check(QTreeNode     *node);
+#endif
+
+static QTreeNode*
+q_tree_node_new(gpointer key,
+                gpointer value)
+{
+    QTreeNode *node = g_new(QTreeNode, 1);
+
+    node->balance = 0;
+    node->left = NULL;
+    node->right = NULL;
+    node->left_child = FALSE;
+    node->right_child = FALSE;
+    node->key = key;
+    node->value = value;
+
+    return node;
+}
+
+/**
+ * q_tree_new:
+ * @key_compare_func: the function used to order the nodes in the #QTree.
+ *   It should return values similar to the standard strcmp() function -
+ *   0 if the two arguments are equal, a negative value if the first argument
+ *   comes before the second, or a positive value if the first argument comes
+ *   after the second.
+ *
+ * Creates a new #QTree.
+ *
+ * Returns: a newly allocated #QTree
+ */
+QTree *
+q_tree_new(GCompareFunc key_compare_func)
+{
+    g_return_val_if_fail(key_compare_func != NULL, NULL);
+
+    return q_tree_new_full((GCompareDataFunc) key_compare_func, NULL,
+                           NULL, NULL);
+}
+
+/**
+ * q_tree_new_with_data:
+ * @key_compare_func: qsort()-style comparison function
+ * @key_compare_data: data to pass to comparison function
+ *
+ * Creates a new #QTree with a comparison function that accepts user data.
+ * See q_tree_new() for more details.
+ *
+ * Returns: a newly allocated #QTree
+ */
+QTree *
+q_tree_new_with_data(GCompareDataFunc key_compare_func,
+                     gpointer         key_compare_data)
+{
+    g_return_val_if_fail(key_compare_func != NULL, NULL);
+
+    return q_tree_new_full(key_compare_func, key_compare_data,
+                           NULL, NULL);
+}
+
+/**
+ * q_tree_new_full:
+ * @key_compare_func: qsort()-style comparison function
+ * @key_compare_data: data to pass to comparison function
+ * @key_destroy_func: a function to free the memory allocated for the key
+ *   used when removing the entry from the #QTree or %NULL if you don't
+ *   want to supply such a function
+ * @value_destroy_func: a function to free the memory allocated for the
+ *   value used when removing the entry from the #QTree or %NULL if you
+ *   don't want to supply such a function
+ *
+ * Creates a new #QTree like q_tree_new() and allows to specify functions
+ * to free the memory allocated for the key and value that get called when
+ * removing the entry from the #QTree.
+ *
+ * Returns: a newly allocated #QTree
+ */
+QTree *
+q_tree_new_full(GCompareDataFunc key_compare_func,
+                gpointer         key_compare_data,
+                GDestroyNotify   key_destroy_func,
+                GDestroyNotify   value_destroy_func)
+{
+    QTree *tree;
+
+    g_return_val_if_fail(key_compare_func != NULL, NULL);
+
+    tree = g_new(QTree, 1);
+    tree->root               = NULL;
+    tree->key_compare        = key_compare_func;
+    tree->key_destroy_func   = key_destroy_func;
+    tree->value_destroy_func = value_destroy_func;
+    tree->key_compare_data   = key_compare_data;
+    tree->nnodes             = 0;
+    tree->ref_count          = 1;
+
+    return tree;
+}
+
+/**
+ * q_tree_node_first:
+ * @tree: a #QTree
+ *
+ * Returns the first in-order node of the tree, or %NULL
+ * for an empty tree.
+ *
+ * Returns: (nullable) (transfer none): the first node in the tree
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_node_first(QTree *tree)
+{
+    QTreeNode *tmp;
+
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    if (!tree->root) {
+        return NULL;
+    }
+
+    tmp = tree->root;
+
+    while (tmp->left_child) {
+        tmp = tmp->left;
+    }
+
+    return tmp;
+}
+
+/**
+ * q_tree_node_previous
+ * @node: a #QTree node
+ *
+ * Returns the previous in-order node of the tree, or %NULL
+ * if the passed node was already the first one.
+ *
+ * Returns: (nullable) (transfer none): the previous node in the tree
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_node_previous(QTreeNode *node)
+{
+    QTreeNode *tmp;
+
+    g_return_val_if_fail(node != NULL, NULL);
+
+    tmp = node->left;
+
+    if (node->left_child) {
+        while (tmp->right_child) {
+            tmp = tmp->right;
+        }
+    }
+
+    return tmp;
+}
+
+/**
+ * q_tree_node_next
+ * @node: a #QTree node
+ *
+ * Returns the next in-order node of the tree, or %NULL
+ * if the passed node was already the last one.
+ *
+ * Returns: (nullable) (transfer none): the next node in the tree
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_node_next(QTreeNode *node)
+{
+    QTreeNode *tmp;
+
+    g_return_val_if_fail(node != NULL, NULL);
+
+    tmp = node->right;
+
+    if (node->right_child) {
+        while (tmp->left_child) {
+            tmp = tmp->left;
+        }
+    }
+
+    return tmp;
+}
+
+/**
+ * q_tree_remove_all:
+ * @tree: a #QTree
+ *
+ * Removes all nodes from a #QTree and destroys their keys and values,
+ * then resets the #QTree’s root to %NULL.
+ *
+ * Since: 2.70 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static void
+q_tree_remove_all(QTree *tree)
+{
+    QTreeNode *node;
+    QTreeNode *next;
+
+    g_return_if_fail(tree != NULL);
+
+    node = q_tree_node_first(tree);
+
+    while (node) {
+        next = q_tree_node_next(node);
+
+        if (tree->key_destroy_func) {
+            tree->key_destroy_func(node->key);
+        }
+        if (tree->value_destroy_func) {
+            tree->value_destroy_func(node->value);
+        }
+        g_free(node);
+
+#ifdef Q_TREE_DEBUG
+        g_assert(tree->nnodes > 0);
+        tree->nnodes--;
+#endif
+
+        node = next;
+    }
+
+#ifdef Q_TREE_DEBUG
+    g_assert(tree->nnodes == 0);
+#endif
+
+    tree->root = NULL;
+#ifndef Q_TREE_DEBUG
+    tree->nnodes = 0;
+#endif
+}
+
+/**
+ * q_tree_ref:
+ * @tree: a #QTree
+ *
+ * Increments the reference count of @tree by one.
+ *
+ * It is safe to call this function from any thread.
+ *
+ * Returns: the passed in #QTree
+ *
+ * Since: 2.22
+ */
+QTree *
+q_tree_ref(QTree *tree)
+{
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    g_atomic_int_inc(&tree->ref_count);
+
+    return tree;
+}
+
+/**
+ * q_tree_unref:
+ * @tree: a #QTree
+ *
+ * Decrements the reference count of @tree by one.
+ * If the reference count drops to 0, all keys and values will
+ * be destroyed (if destroy functions were specified) and all
+ * memory allocated by @tree will be released.
+ *
+ * It is safe to call this function from any thread.
+ *
+ * Since: 2.22
+ */
+void
+q_tree_unref(QTree *tree)
+{
+    g_return_if_fail(tree != NULL);
+
+    if (g_atomic_int_dec_and_test(&tree->ref_count)) {
+        q_tree_remove_all(tree);
+        g_free(tree);
+    }
+}
+
+/**
+ * q_tree_destroy:
+ * @tree: a #QTree
+ *
+ * Removes all keys and values from the #QTree and decreases its
+ * reference count by one. If keys and/or values are dynamically
+ * allocated, you should either free them first or create the #QTree
+ * using q_tree_new_full(). In the latter case the destroy functions
+ * you supplied will be called on all keys and values before destroying
+ * the #QTree.
+ */
+void
+q_tree_destroy(QTree *tree)
+{
+    g_return_if_fail(tree != NULL);
+
+    q_tree_remove_all(tree);
+    q_tree_unref(tree);
+}
+
+/**
+ * q_tree_insert_node:
+ * @tree: a #QTree
+ * @key: the key to insert
+ * @value: the value corresponding to the key
+ *
+ * Inserts a key/value pair into a #QTree.
+ *
+ * If the given key already exists in the #QTree its corresponding value
+ * is set to the new value. If you supplied a @value_destroy_func when
+ * creating the #QTree, the old value is freed using that function. If
+ * you supplied a @key_destroy_func when creating the #QTree, the passed
+ * key is freed using that function.
+ *
+ * The tree is automatically 'balanced' as new key/value pairs are added,
+ * so that the distance from the root to every leaf is as small as possible.
+ * The cost of maintaining a balanced tree while inserting new key/value
+ * result in a O(n log(n)) operation where most of the other operations
+ * are O(log(n)).
+ *
+ * Returns: (transfer none): the inserted (or set) node.
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_insert_node(QTree    *tree,
+                   gpointer  key,
+                   gpointer  value)
+{
+    QTreeNode *node;
+
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    node = q_tree_insert_internal(tree, key, value, FALSE);
+
+#ifdef Q_TREE_DEBUG
+    q_tree_node_check(tree->root);
+#endif
+
+    return node;
+}
+
+/**
+ * q_tree_insert:
+ * @tree: a #QTree
+ * @key: the key to insert
+ * @value: the value corresponding to the key
+ *
+ * Inserts a key/value pair into a #QTree.
+ *
+ * Inserts a new key and value into a #QTree as q_tree_insert_node() does,
+ * only this function does not return the inserted or set node.
+ */
+void
+q_tree_insert(QTree    *tree,
+              gpointer  key,
+              gpointer  value)
+{
+    q_tree_insert_node(tree, key, value);
+}
+
+/**
+ * q_tree_replace_node:
+ * @tree: a #QTree
+ * @key: the key to insert
+ * @value: the value corresponding to the key
+ *
+ * Inserts a new key and value into a #QTree similar to q_tree_insert_node().
+ * The difference is that if the key already exists in the #QTree, it gets
+ * replaced by the new key. If you supplied a @value_destroy_func when
+ * creating the #QTree, the old value is freed using that function. If you
+ * supplied a @key_destroy_func when creating the #QTree, the old key is
+ * freed using that function.
+ *
+ * The tree is automatically 'balanced' as new key/value pairs are added,
+ * so that the distance from the root to every leaf is as small as possible.
+ *
+ * Returns: (transfer none): the inserted (or set) node.
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_replace_node(QTree    *tree,
+                    gpointer  key,
+                    gpointer  value)
+{
+    QTreeNode *node;
+
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    node = q_tree_insert_internal(tree, key, value, TRUE);
+
+#ifdef Q_TREE_DEBUG
+    q_tree_node_check(tree->root);
+#endif
+
+    return node;
+}
+
+/**
+ * q_tree_replace:
+ * @tree: a #QTree
+ * @key: the key to insert
+ * @value: the value corresponding to the key
+ *
+ * Inserts a new key and value into a #QTree as q_tree_replace_node() does,
+ * only this function does not return the inserted or set node.
+ */
+void
+q_tree_replace(QTree    *tree,
+               gpointer  key,
+               gpointer  value)
+{
+    q_tree_replace_node(tree, key, value);
+}
+
+/* internal insert routine */
+static QTreeNode *
+q_tree_insert_internal(QTree    *tree,
+                       gpointer  key,
+                       gpointer  value,
+                       gboolean  replace)
+{
+    QTreeNode *node, *retnode;
+    QTreeNode *path[MAX_GTREE_HEIGHT];
+    int idx;
+
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    if (!tree->root) {
+        tree->root = q_tree_node_new(key, value);
+        tree->nnodes++;
+        return tree->root;
+    }
+
+    idx = 0;
+    path[idx++] = NULL;
+    node = tree->root;
+
+    while (1) {
+        int cmp = tree->key_compare(key, node->key, tree->key_compare_data);
+
+        if (cmp == 0) {
+            if (tree->value_destroy_func) {
+                tree->value_destroy_func(node->value);
+            }
+
+            node->value = value;
+
+            if (replace) {
+                if (tree->key_destroy_func) {
+                    tree->key_destroy_func(node->key);
+                }
+
+                node->key = key;
+            } else {
+                /* free the passed key */
+                if (tree->key_destroy_func) {
+                    tree->key_destroy_func(key);
+                }
+            }
+
+            return node;
+        } else if (cmp < 0) {
+            if (node->left_child) {
+                path[idx++] = node;
+                node = node->left;
+            } else {
+                QTreeNode *child = q_tree_node_new(key, value);
+
+                child->left = node->left;
+                child->right = node;
+                node->left = child;
+                node->left_child = TRUE;
+                node->balance -= 1;
+
+                tree->nnodes++;
+
+                retnode = child;
+                break;
+            }
+        } else {
+            if (node->right_child) {
+                path[idx++] = node;
+                node = node->right;
+            } else {
+                QTreeNode *child = q_tree_node_new(key, value);
+
+                child->right = node->right;
+                child->left = node;
+                node->right = child;
+                node->right_child = TRUE;
+                node->balance += 1;
+
+                tree->nnodes++;
+
+                retnode = child;
+                break;
+            }
+        }
+    }
+
+    /*
+     * Restore balance. This is the goodness of a non-recursive
+     * implementation, when we are done with balancing we 'break'
+     * the loop and we are done.
+     */
+    while (1) {
+        QTreeNode *bparent = path[--idx];
+        gboolean left_node = (bparent && node == bparent->left);
+        g_assert(!bparent || bparent->left == node || bparent->right == node);
+
+        if (node->balance < -1 || node->balance > 1) {
+            node = q_tree_node_balance(node);
+            if (bparent == NULL) {
+                tree->root = node;
+            } else if (left_node) {
+                bparent->left = node;
+            } else {
+                bparent->right = node;
+            }
+        }
+
+        if (node->balance == 0 || bparent == NULL) {
+            break;
+        }
+
+        if (left_node) {
+            bparent->balance -= 1;
+        } else {
+            bparent->balance += 1;
+        }
+
+        node = bparent;
+    }
+
+    return retnode;
+}
+
+/**
+ * q_tree_remove:
+ * @tree: a #QTree
+ * @key: the key to remove
+ *
+ * Removes a key/value pair from a #QTree.
+ *
+ * If the #QTree was created using q_tree_new_full(), the key and value
+ * are freed using the supplied destroy functions, otherwise you have to
+ * make sure that any dynamically allocated values are freed yourself.
+ * If the key does not exist in the #QTree, the function does nothing.
+ *
+ * The cost of maintaining a balanced tree while removing a key/value
+ * result in a O(n log(n)) operation where most of the other operations
+ * are O(log(n)).
+ *
+ * Returns: %TRUE if the key was found (prior to 2.8, this function
+ *     returned nothing)
+ */
+gboolean
+q_tree_remove(QTree         *tree,
+              gconstpointer  key)
+{
+    gboolean removed;
+
+    g_return_val_if_fail(tree != NULL, FALSE);
+
+    removed = q_tree_remove_internal(tree, key, FALSE);
+
+#ifdef Q_TREE_DEBUG
+    q_tree_node_check(tree->root);
+#endif
+
+    return removed;
+}
+
+/**
+ * q_tree_steal:
+ * @tree: a #QTree
+ * @key: the key to remove
+ *
+ * Removes a key and its associated value from a #QTree without calling
+ * the key and value destroy functions.
+ *
+ * If the key does not exist in the #QTree, the function does nothing.
+ *
+ * Returns: %TRUE if the key was found (prior to 2.8, this function
+ *     returned nothing)
+ */
+gboolean
+q_tree_steal(QTree         *tree,
+             gconstpointer  key)
+{
+    gboolean removed;
+
+    g_return_val_if_fail(tree != NULL, FALSE);
+
+    removed = q_tree_remove_internal(tree, key, TRUE);
+
+#ifdef Q_TREE_DEBUG
+    q_tree_node_check(tree->root);
+#endif
+
+    return removed;
+}
+
+/* internal remove routine */
+static gboolean
+q_tree_remove_internal(QTree         *tree,
+                       gconstpointer  key,
+                       gboolean       steal)
+{
+    QTreeNode *node, *parent, *balance;
+    QTreeNode *path[MAX_GTREE_HEIGHT];
+    int idx;
+    gboolean left_node;
+
+    g_return_val_if_fail(tree != NULL, FALSE);
+
+    if (!tree->root) {
+        return FALSE;
+    }
+
+    idx = 0;
+    path[idx++] = NULL;
+    node = tree->root;
+
+    while (1) {
+        int cmp = tree->key_compare(key, node->key, tree->key_compare_data);
+
+        if (cmp == 0) {
+            break;
+        } else if (cmp < 0) {
+            if (!node->left_child) {
+                return FALSE;
+            }
+
+            path[idx++] = node;
+            node = node->left;
+        } else {
+            if (!node->right_child) {
+                return FALSE;
+            }
+
+            path[idx++] = node;
+            node = node->right;
+        }
+    }
+
+    /*
+     * The following code is almost equal to q_tree_remove_node,
+     * except that we do not have to call q_tree_node_parent.
+     */
+    balance = parent = path[--idx];
+    g_assert(!parent || parent->left == node || parent->right == node);
+    left_node = (parent && node == parent->left);
+
+    if (!node->left_child) {
+        if (!node->right_child) {
+            if (!parent) {
+                tree->root = NULL;
+            } else if (left_node) {
+                parent->left_child = FALSE;
+                parent->left = node->left;
+                parent->balance += 1;
+            } else {
+                parent->right_child = FALSE;
+                parent->right = node->right;
+                parent->balance -= 1;
+            }
+        } else {
+            /* node has a right child */
+            QTreeNode *tmp = q_tree_node_next(node);
+            tmp->left = node->left;
+
+            if (!parent) {
+                tree->root = node->right;
+            } else if (left_node) {
+                parent->left = node->right;
+                parent->balance += 1;
+            } else {
+                parent->right = node->right;
+                parent->balance -= 1;
+            }
+        }
+    } else {
+        /* node has a left child */
+        if (!node->right_child) {
+            QTreeNode *tmp = q_tree_node_previous(node);
+            tmp->right = node->right;
+
+            if (parent == NULL) {
+                tree->root = node->left;
+            } else if (left_node) {
+                parent->left = node->left;
+                parent->balance += 1;
+            } else {
+                parent->right = node->left;
+                parent->balance -= 1;
+            }
+        } else {
+            /* node has a both children (pant, pant!) */
+            QTreeNode *prev = node->left;
+            QTreeNode *next = node->right;
+            QTreeNode *nextp = node;
+            int old_idx = idx + 1;
+            idx++;
+
+            /* path[idx] == parent */
+            /* find the immediately next node (and its parent) */
+            while (next->left_child) {
+                path[++idx] = nextp = next;
+                next = next->left;
+            }
+
+            path[old_idx] = next;
+            balance = path[idx];
+
+            /* remove 'next' from the tree */
+            if (nextp != node) {
+                if (next->right_child) {
+                    nextp->left = next->right;
+                } else {
+                    nextp->left_child = FALSE;
+                }
+                nextp->balance += 1;
+
+                next->right_child = TRUE;
+                next->right = node->right;
+            } else {
+                node->balance -= 1;
+            }
+
+            /* set the prev to point to the right place */
+            while (prev->right_child) {
+                prev = prev->right;
+            }
+            prev->right = next;
+
+            /* prepare 'next' to replace 'node' */
+            next->left_child = TRUE;
+            next->left = node->left;
+            next->balance = node->balance;
+
+            if (!parent) {
+                tree->root = next;
+            } else if (left_node) {
+                parent->left = next;
+            } else {
+                parent->right = next;
+            }
+        }
+    }
+
+    /* restore balance */
+    if (balance) {
+        while (1) {
+            QTreeNode *bparent = path[--idx];
+            g_assert(!bparent ||
+                     bparent->left == balance ||
+                     bparent->right == balance);
+            left_node = (bparent && balance == bparent->left);
+
+            if (balance->balance < -1 || balance->balance > 1) {
+                balance = q_tree_node_balance(balance);
+                if (!bparent) {
+                    tree->root = balance;
+                } else if (left_node) {
+                    bparent->left = balance;
+                } else {
+                    bparent->right = balance;
+                }
+            }
+
+            if (balance->balance != 0 || !bparent) {
+                break;
+            }
+
+            if (left_node) {
+                bparent->balance += 1;
+            } else {
+                bparent->balance -= 1;
+            }
+
+            balance = bparent;
+        }
+    }
+
+    if (!steal) {
+        if (tree->key_destroy_func) {
+            tree->key_destroy_func(node->key);
+        }
+        if (tree->value_destroy_func) {
+            tree->value_destroy_func(node->value);
+        }
+    }
+
+    g_free(node);
+
+    tree->nnodes--;
+
+    return TRUE;
+}
+
+/**
+ * q_tree_lookup_node:
+ * @tree: a #QTree
+ * @key: the key to look up
+ *
+ * Gets the tree node corresponding to the given key. Since a #QTree is
+ * automatically balanced as key/value pairs are added, key lookup
+ * is O(log n) (where n is the number of key/value pairs in the tree).
+ *
+ * Returns: (nullable) (transfer none): the tree node corresponding to
+ *          the key, or %NULL if the key was not found
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_lookup_node(QTree         *tree,
+                   gconstpointer  key)
+{
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    return q_tree_find_node(tree, key);
+}
+
+/**
+ * q_tree_lookup:
+ * @tree: a #QTree
+ * @key: the key to look up
+ *
+ * Gets the value corresponding to the given key. Since a #QTree is
+ * automatically balanced as key/value pairs are added, key lookup
+ * is O(log n) (where n is the number of key/value pairs in the tree).
+ *
+ * Returns: the value corresponding to the key, or %NULL
+ *     if the key was not found
+ */
+gpointer
+q_tree_lookup(QTree         *tree,
+              gconstpointer  key)
+{
+    QTreeNode *node;
+
+    node = q_tree_lookup_node(tree, key);
+
+    return node ? node->value : NULL;
+}
+
+/**
+ * q_tree_lookup_extended:
+ * @tree: a #QTree
+ * @lookup_key: the key to look up
+ * @orig_key: (out) (optional) (nullable): returns the original key
+ * @value: (out) (optional) (nullable): returns the value associated with
+ *         the key
+ *
+ * Looks up a key in the #QTree, returning the original key and the
+ * associated value. This is useful if you need to free the memory
+ * allocated for the original key, for example before calling
+ * q_tree_remove().
+ *
+ * Returns: %TRUE if the key was found in the #QTree
+ */
+gboolean
+q_tree_lookup_extended(QTree         *tree,
+                       gconstpointer  lookup_key,
+                       gpointer      *orig_key,
+                       gpointer      *value)
+{
+    QTreeNode *node;
+
+    g_return_val_if_fail(tree != NULL, FALSE);
+
+    node = q_tree_find_node(tree, lookup_key);
+
+    if (node) {
+        if (orig_key) {
+            *orig_key = node->key;
+        }
+        if (value) {
+            *value = node->value;
+        }
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+/**
+ * q_tree_foreach:
+ * @tree: a #QTree
+ * @func: the function to call for each node visited.
+ *     If this function returns %TRUE, the traversal is stopped.
+ * @user_data: user data to pass to the function
+ *
+ * Calls the given function for each of the key/value pairs in the #QTree.
+ * The function is passed the key and value of each pair, and the given
+ * @data parameter. The tree is traversed in sorted order.
+ *
+ * The tree may not be modified while iterating over it (you can't
+ * add/remove items). To remove all items matching a predicate, you need
+ * to add each item to a list in your #GTraverseFunc as you walk over
+ * the tree, then walk the list and remove each item.
+ */
+void
+q_tree_foreach(QTree         *tree,
+               GTraverseFunc  func,
+               gpointer       user_data)
+{
+    QTreeNode *node;
+
+    g_return_if_fail(tree != NULL);
+
+    if (!tree->root) {
+        return;
+    }
+
+    node = q_tree_node_first(tree);
+
+    while (node) {
+        if ((*func)(node->key, node->value, user_data)) {
+            break;
+        }
+
+        node = q_tree_node_next(node);
+    }
+}
+
+/**
+ * q_tree_search_node:
+ * @tree: a #QTree
+ * @search_func: a function used to search the #QTree
+ * @user_data: the data passed as the second argument to @search_func
+ *
+ * Searches a #QTree using @search_func.
+ *
+ * The @search_func is called with a pointer to the key of a key/value
+ * pair in the tree, and the passed in @user_data. If @search_func returns
+ * 0 for a key/value pair, then the corresponding node is returned as
+ * the result of q_tree_search(). If @search_func returns -1, searching
+ * will proceed among the key/value pairs that have a smaller key; if
+ * @search_func returns 1, searching will proceed among the key/value
+ * pairs that have a larger key.
+ *
+ * Returns: (nullable) (transfer none): the node corresponding to the
+ *          found key, or %NULL if the key was not found
+ *
+ * Since: 2.68 in GLib. Internal in Qtree, i.e. not in the public API.
+ */
+static QTreeNode *
+q_tree_search_node(QTree         *tree,
+                   GCompareFunc   search_func,
+                   gconstpointer  user_data)
+{
+    g_return_val_if_fail(tree != NULL, NULL);
+
+    if (!tree->root) {
+        return NULL;
+    }
+
+    return q_tree_node_search(tree->root, search_func, user_data);
+}
+
+/**
+ * q_tree_search:
+ * @tree: a #QTree
+ * @search_func: a function used to search the #QTree
+ * @user_data: the data passed as the second argument to @search_func
+ *
+ * Searches a #QTree using @search_func.
+ *
+ * The @search_func is called with a pointer to the key of a key/value
+ * pair in the tree, and the passed in @user_data. If @search_func returns
+ * 0 for a key/value pair, then the corresponding value is returned as
+ * the result of q_tree_search(). If @search_func returns -1, searching
+ * will proceed among the key/value pairs that have a smaller key; if
+ * @search_func returns 1, searching will proceed among the key/value
+ * pairs that have a larger key.
+ *
+ * Returns: the value corresponding to the found key, or %NULL
+ *     if the key was not found
+ */
+gpointer
+q_tree_search(QTree         *tree,
+              GCompareFunc   search_func,
+              gconstpointer  user_data)
+{
+    QTreeNode *node;
+
+    node = q_tree_search_node(tree, search_func, user_data);
+
+    return node ? node->value : NULL;
+}
+
+/**
+ * q_tree_height:
+ * @tree: a #QTree
+ *
+ * Gets the height of a #QTree.
+ *
+ * If the #QTree contains no nodes, the height is 0.
+ * If the #QTree contains only one root node the height is 1.
+ * If the root node has children the height is 2, etc.
+ *
+ * Returns: the height of @tree
+ */
+gint
+q_tree_height(QTree *tree)
+{
+    QTreeNode *node;
+    gint height;
+
+    g_return_val_if_fail(tree != NULL, 0);
+
+    if (!tree->root) {
+        return 0;
+    }
+
+    height = 0;
+    node = tree->root;
+
+    while (1) {
+        height += 1 + MAX(node->balance, 0);
+
+        if (!node->left_child) {
+            return height;
+        }
+
+        node = node->left;
+    }
+}
+
+/**
+ * q_tree_nnodes:
+ * @tree: a #QTree
+ *
+ * Gets the number of nodes in a #QTree.
+ *
+ * Returns: the number of nodes in @tree
+ */
+gint
+q_tree_nnodes(QTree *tree)
+{
+    g_return_val_if_fail(tree != NULL, 0);
+
+    return tree->nnodes;
+}
+
+static QTreeNode *
+q_tree_node_balance(QTreeNode *node)
+{
+    if (node->balance < -1) {
+        if (node->left->balance > 0) {
+            node->left = q_tree_node_rotate_left(node->left);
+        }
+        node = q_tree_node_rotate_right(node);
+    } else if (node->balance > 1) {
+        if (node->right->balance < 0) {
+            node->right = q_tree_node_rotate_right(node->right);
+        }
+        node = q_tree_node_rotate_left(node);
+    }
+
+    return node;
+}
+
+static QTreeNode *
+q_tree_find_node(QTree        *tree,
+                 gconstpointer key)
+{
+    QTreeNode *node;
+    gint cmp;
+
+    node = tree->root;
+    if (!node) {
+        return NULL;
+    }
+
+    while (1) {
+        cmp = tree->key_compare(key, node->key, tree->key_compare_data);
+        if (cmp == 0) {
+            return node;
+        } else if (cmp < 0) {
+            if (!node->left_child) {
+                return NULL;
+            }
+
+            node = node->left;
+        } else {
+            if (!node->right_child) {
+                return NULL;
+            }
+
+            node = node->right;
+        }
+    }
+}
+
+static QTreeNode *
+q_tree_node_search(QTreeNode     *node,
+                   GCompareFunc   search_func,
+                   gconstpointer  data)
+{
+    gint dir;
+
+    if (!node) {
+        return NULL;
+    }
+
+    while (1) {
+        dir = (*search_func)(node->key, data);
+        if (dir == 0) {
+            return node;
+        } else if (dir < 0) {
+            if (!node->left_child) {
+                return NULL;
+            }
+
+            node = node->left;
+        } else {
+            if (!node->right_child) {
+                return NULL;
+            }
+
+            node = node->right;
+        }
+    }
+}
+
+static QTreeNode *
+q_tree_node_rotate_left(QTreeNode *node)
+{
+    QTreeNode *right;
+    gint a_bal;
+    gint b_bal;
+
+    right = node->right;
+
+    if (right->left_child) {
+        node->right = right->left;
+    } else {
+        node->right_child = FALSE;
+        right->left_child = TRUE;
+    }
+    right->left = node;
+
+    a_bal = node->balance;
+    b_bal = right->balance;
+
+    if (b_bal <= 0) {
+        if (a_bal >= 1) {
+            right->balance = b_bal - 1;
+        } else {
+            right->balance = a_bal + b_bal - 2;
+        }
+        node->balance = a_bal - 1;
+    } else {
+        if (a_bal <= b_bal) {
+            right->balance = a_bal - 2;
+        } else {
+            right->balance = b_bal - 1;
+        }
+        node->balance = a_bal - b_bal - 1;
+    }
+
+    return right;
+}
+
+static QTreeNode *
+q_tree_node_rotate_right(QTreeNode *node)
+{
+    QTreeNode *left;
+    gint a_bal;
+    gint b_bal;
+
+    left = node->left;
+
+    if (left->right_child) {
+        node->left = left->right;
+    } else {
+        node->left_child = FALSE;
+        left->right_child = TRUE;
+    }
+    left->right = node;
+
+    a_bal = node->balance;
+    b_bal = left->balance;
+
+    if (b_bal <= 0) {
+        if (b_bal > a_bal) {
+            left->balance = b_bal + 1;
+        } else {
+            left->balance = a_bal + 2;
+        }
+        node->balance = a_bal - b_bal + 1;
+    } else {
+        if (a_bal <= -1) {
+            left->balance = b_bal + 1;
+        } else {
+            left->balance = a_bal + b_bal + 2;
+        }
+        node->balance = a_bal + 1;
+    }
+
+    return left;
+}
+
+#ifdef Q_TREE_DEBUG
+static gint
+q_tree_node_height(QTreeNode *node)
+{
+    gint left_height;
+    gint right_height;
+
+    if (node) {
+        left_height = 0;
+        right_height = 0;
+
+        if (node->left_child) {
+            left_height = q_tree_node_height(node->left);
+        }
+
+        if (node->right_child) {
+            right_height = q_tree_node_height(node->right);
+        }
+
+        return MAX(left_height, right_height) + 1;
+    }
+
+    return 0;
+}
+
+static void q_tree_node_check(QTreeNode *node)
+{
+    gint left_height;
+    gint right_height;
+    gint balance;
+    QTreeNode *tmp;
+
+    if (node) {
+        if (node->left_child) {
+            tmp = q_tree_node_previous(node);
+            g_assert(tmp->right == node);
+        }
+
+        if (node->right_child) {
+            tmp = q_tree_node_next(node);
+            g_assert(tmp->left == node);
+        }
+
+        left_height = 0;
+        right_height = 0;
+
+        if (node->left_child) {
+            left_height = q_tree_node_height(node->left);
+        }
+        if (node->right_child) {
+            right_height = q_tree_node_height(node->right);
+        }
+
+        balance = right_height - left_height;
+        g_assert(balance == node->balance);
+
+        if (node->left_child) {
+            q_tree_node_check(node->left);
+        }
+        if (node->right_child) {
+            q_tree_node_check(node->right);
+        }
+    }
+}
+#endif
diff --git a/tests/bench/meson.build b/tests/bench/meson.build
index XXXXXXX..XXXXXXX 100644
--- a/tests/bench/meson.build
+++ b/tests/bench/meson.build
@@ -XXX,XX +XXX,XX @@ xbzrle_bench = executable('xbzrle-bench',
                        dependencies: [qemuutil,migration])
 endif
 
+qtree_bench = executable('qtree-bench',
+                         sources: 'qtree-bench.c',
+                         dependencies: [qemuutil])
+
 executable('atomic_add-bench',
            sources: files('atomic_add-bench.c'),
            dependencies: [qemuutil],
diff --git a/tests/unit/meson.build b/tests/unit/meson.build
index XXXXXXX..XXXXXXX 100644
--- a/tests/unit/meson.build
+++ b/tests/unit/meson.build
@@ -XXX,XX +XXX,XX @@ tests = {
   'test-rcu-slist': [],
   'test-qdist': [],
   'test-qht': [],
+  'test-qtree': [],
   'test-bitops': [],
   'test-bitcnt': [],
   'test-qgraph': ['../qtest/libqos/qgraph.c'],
diff --git a/util/meson.build b/util/meson.build
index XXXXXXX..XXXXXXX 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -XXX,XX +XXX,XX @@ util_ss.add(when: 'CONFIG_WIN32', if_true: files('oslib-win32.c'))
 util_ss.add(when: 'CONFIG_WIN32', if_true: files('qemu-thread-win32.c'))
 util_ss.add(when: 'CONFIG_WIN32', if_true: winmm)
 util_ss.add(when: 'CONFIG_WIN32', if_true: pathcch)
+util_ss.add(when: 'HAVE_GLIB_WITH_SLICE_ALLOCATOR', if_true: files('qtree.c'))
 util_ss.add(files('envlist.c', 'path.c', 'module.c'))
 util_ss.add(files('host-utils.c'))
 util_ss.add(files('bitmap.c', 'bitops.c'))
-- 
2.34.1

From: Emilio Cota <cota@braap.org>

qemu-user can hang in a multi-threaded fork. One common
reason is that when creating a TB, between fork and exec
we manipulate a GTree whose memory allocator (GSlice) is
not fork-safe.

Although POSIX does not mandate it, the system's allocator
(e.g. tcmalloc, libc malloc) is probably fork-safe.

Fix some of these hangs by using QTree, which uses the system's
allocator regardless of the Glib version that we used at
configuration time.

Tested with the test program in the original bug report, i.e.:
```

void garble() {
  int pid = fork();
  if (pid == 0) {
    exit(0);
  } else {
    int wstatus;
    waitpid(pid, &wstatus, 0);
  }
}

void supragarble(unsigned depth) {
  if (depth == 0)
    return ;

std::thread a(supragarble, depth-1);
  std::thread b(supragarble, depth-1);
  garble();
  a.join();
  b.join();
}

int main() {
  supragarble(10);
}
```

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/285
Reported-by: Valentin David <me@valentindavid.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Emilio Cota <cota@braap.org>
Message-Id: <20230205163758.416992-3-cota@braap.org>
[rth: Add QEMU_DISABLE_CFI for all callback using functions.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/tb-maint.c | 17 +++++++++--------
 tcg/region.c         | 19 ++++++++++---------
 util/qtree.c         |  8 ++++----
 3 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -XXX,XX +XXX,XX @@
 
 #include "qemu/osdep.h"
 #include "qemu/interval-tree.h"
+#include "qemu/qtree.h"
 #include "exec/cputlb.h"
 #include "exec/log.h"
 #include "exec/exec-all.h"
@@ -XXX,XX +XXX,XX @@ struct page_entry {
  * See also: page_collection_lock().
  */
 struct page_collection {
-    GTree *tree;
+    QTree *tree;
     struct page_entry *max;
 };
 
@@ -XXX,XX +XXX,XX @@ static bool page_trylock_add(struct page_collection *set, tb_page_addr_t addr)
     struct page_entry *pe;
     PageDesc *pd;
 
-    pe = g_tree_lookup(set->tree, &index);
+    pe = q_tree_lookup(set->tree, &index);
     if (pe) {
         return false;
     }
@@ -XXX,XX +XXX,XX @@ static bool page_trylock_add(struct page_collection *set, tb_page_addr_t addr)
     }
 
     pe = page_entry_new(pd, index);
-    g_tree_insert(set->tree, &pe->index, pe);
+    q_tree_insert(set->tree, &pe->index, pe);
 
     /*
      * If this is either (1) the first insertion or (2) a page whose index
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
     end   >>= TARGET_PAGE_BITS;
     g_assert(start <= end);
 
-    set->tree = g_tree_new_full(tb_page_addr_cmp, NULL, NULL,
+    set->tree = q_tree_new_full(tb_page_addr_cmp, NULL, NULL,
                                 page_entry_destroy);
     set->max = NULL;
     assert_no_pages_locked();
 
  retry:
-    g_tree_foreach(set->tree, page_entry_lock, NULL);
+    q_tree_foreach(set->tree, page_entry_lock, NULL);
 
     for (index = start; index <= end; index++) {
         TranslationBlock *tb;
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
             continue;
         }
         if (page_trylock_add(set, index << TARGET_PAGE_BITS)) {
-            g_tree_foreach(set->tree, page_entry_unlock, NULL);
+            q_tree_foreach(set->tree, page_entry_unlock, NULL);
             goto retry;
         }
         assert_page_locked(pd);
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
                 (tb_page_addr1(tb) != -1 &&
                  page_trylock_add(set, tb_page_addr1(tb)))) {
                 /* drop all locks, and reacquire in order */
-                g_tree_foreach(set->tree, page_entry_unlock, NULL);
+                q_tree_foreach(set->tree, page_entry_unlock, NULL);
                 goto retry;
             }
         }
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
 static void page_collection_unlock(struct page_collection *set)
 {
     /* entries are unlocked and freed via page_entry_destroy */
-    g_tree_destroy(set->tree);
+    q_tree_destroy(set->tree);
     g_free(set);
 }
 
diff --git a/tcg/region.c b/tcg/region.c
index XXXXXXX..XXXXXXX 100644
--- a/tcg/region.c
+++ b/tcg/region.c
@@ -XXX,XX +XXX,XX @@
 #include "qemu/mprotect.h"
 #include "qemu/memalign.h"
 #include "qemu/cacheinfo.h"
+#include "qemu/qtree.h"
 #include "qapi/error.h"
 #include "exec/exec-all.h"
 #include "tcg/tcg.h"
@@ -XXX,XX +XXX,XX @@
 
 struct tcg_region_tree {
     QemuMutex lock;
-    GTree *tree;
+    QTree *tree;
     /* padding to avoid false sharing is computed at run-time */
 };
 
@@ -XXX,XX +XXX,XX @@ static void tcg_region_trees_init(void)
         struct tcg_region_tree *rt = region_trees + i * tree_size;
 
         qemu_mutex_init(&rt->lock);
-        rt->tree = g_tree_new_full(tb_tc_cmp, NULL, NULL, tb_destroy);
+        rt->tree = q_tree_new_full(tb_tc_cmp, NULL, NULL, tb_destroy);
     }
 }
 
@@ -XXX,XX +XXX,XX @@ void tcg_tb_insert(TranslationBlock *tb)
 
     g_assert(rt != NULL);
     qemu_mutex_lock(&rt->lock);
-    g_tree_insert(rt->tree, &tb->tc, tb);
+    q_tree_insert(rt->tree, &tb->tc, tb);
     qemu_mutex_unlock(&rt->lock);
 }
 
@@ -XXX,XX +XXX,XX @@ void tcg_tb_remove(TranslationBlock *tb)
 
     g_assert(rt != NULL);
     qemu_mutex_lock(&rt->lock);
-    g_tree_remove(rt->tree, &tb->tc);
+    q_tree_remove(rt->tree, &tb->tc);
     qemu_mutex_unlock(&rt->lock);
 }
 
@@ -XXX,XX +XXX,XX @@ TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr)
     }
 
     qemu_mutex_lock(&rt->lock);
-    tb = g_tree_lookup(rt->tree, &s);
+    tb = q_tree_lookup(rt->tree, &s);
     qemu_mutex_unlock(&rt->lock);
     return tb;
 }
@@ -XXX,XX +XXX,XX @@ void tcg_tb_foreach(GTraverseFunc func, gpointer user_data)
     for (i = 0; i < region.n; i++) {
         struct tcg_region_tree *rt = region_trees + i * tree_size;
 
-        g_tree_foreach(rt->tree, func, user_data);
+        q_tree_foreach(rt->tree, func, user_data);
     }
     tcg_region_tree_unlock_all();
 }
@@ -XXX,XX +XXX,XX @@ size_t tcg_nb_tbs(void)
     for (i = 0; i < region.n; i++) {
         struct tcg_region_tree *rt = region_trees + i * tree_size;
 
-        nb_tbs += g_tree_nnodes(rt->tree);
+        nb_tbs += q_tree_nnodes(rt->tree);
     }
     tcg_region_tree_unlock_all();
     return nb_tbs;
@@ -XXX,XX +XXX,XX @@ static void tcg_region_tree_reset_all(void)
         struct tcg_region_tree *rt = region_trees + i * tree_size;
 
         /* Increment the refcount first so that destroy acts as a reset */
-        g_tree_ref(rt->tree);
-        g_tree_destroy(rt->tree);
+        q_tree_ref(rt->tree);
+        q_tree_destroy(rt->tree);
     }
     tcg_region_tree_unlock_all();
 }
diff --git a/util/qtree.c b/util/qtree.c
index XXXXXXX..XXXXXXX 100644
--- a/util/qtree.c
+++ b/util/qtree.c
@@ -XXX,XX +XXX,XX @@ q_tree_node_next(QTreeNode *node)
  *
  * Since: 2.70 in GLib. Internal in Qtree, i.e. not in the public API.
  */
-static void
+static void QEMU_DISABLE_CFI
 q_tree_remove_all(QTree *tree)
 {
     QTreeNode *node;
@@ -XXX,XX +XXX,XX @@ q_tree_replace(QTree    *tree,
 }
 
 /* internal insert routine */
-static QTreeNode *
+static QTreeNode * QEMU_DISABLE_CFI
 q_tree_insert_internal(QTree    *tree,
                        gpointer  key,
                        gpointer  value,
@@ -XXX,XX +XXX,XX @@ q_tree_steal(QTree         *tree,
 }
 
 /* internal remove routine */
-static gboolean
+static gboolean QEMU_DISABLE_CFI
 q_tree_remove_internal(QTree         *tree,
                        gconstpointer  key,
                        gboolean       steal)
@@ -XXX,XX +XXX,XX @@ q_tree_node_balance(QTreeNode *node)
     return node;
 }
 
-static QTreeNode *
+static QTreeNode * QEMU_DISABLE_CFI
 q_tree_find_node(QTree        *tree,
                  gconstpointer key)
 {
-- 
2.34.1

We have been enforcing host page alignment for the non-R
fallback of MAX_RESERVED_VA, but failing to enforce for -R.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/linux-user/main.c b/linux-user/main.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv, char **envp)
      */
     max_reserved_va = MAX_RESERVED_VA(cpu);
     if (reserved_va != 0) {
+        if (reserved_va % qemu_host_page_size) {
+            char *s = size_to_str(qemu_host_page_size);
+            fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
+            g_free(s);
+            exit(EXIT_FAILURE);
+        }
         if (max_reserved_va && reserved_va > max_reserved_va) {
             fprintf(stderr, "Reserved virtual address too big\n");
             exit(EXIT_FAILURE);
-- 
2.34.1

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1528
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/cpu-all.h |  2 +-
 accel/tcg/user-exec.c  | 16 +++++++---------
 bsd-user/mmap.c        |  6 +++---
 linux-user/elfload.c   | 11 ++++++-----
 linux-user/mmap.c      | 16 ++++++++--------
 linux-user/syscall.c   |  4 ++--
 6 files changed, 27 insertions(+), 28 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index XXXXXXX..XXXXXXX 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -XXX,XX +XXX,XX @@ typedef int (*walk_memory_regions_fn)(void *, target_ulong,
 int walk_memory_regions(void *, walk_memory_regions_fn);
 
 int page_get_flags(target_ulong address);
-void page_set_flags(target_ulong start, target_ulong end, int flags);
+void page_set_flags(target_ulong start, target_ulong last, int flags);
 void page_reset_target_data(target_ulong start, target_ulong end);
 int page_check_range(target_ulong start, target_ulong len, int flags);
 
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -XXX,XX +XXX,XX @@ static bool pageflags_set_clear(target_ulong start, target_ulong last,
  * The flag PAGE_WRITE_ORG is positioned automatically depending
  * on PAGE_WRITE.  The mmap_lock should already be held.
  */
-void page_set_flags(target_ulong start, target_ulong end, int flags)
+void page_set_flags(target_ulong start, target_ulong last, int flags)
 {
-    target_ulong last;
     bool reset = false;
     bool inval_tb = false;
 
     /* This function should never be called with addresses outside the
        guest address space.  If this assert fires, it probably indicates
        a missing call to h2g_valid.  */
-    assert(start < end);
-    assert(end - 1 <= GUEST_ADDR_MAX);
+    assert(start <= last);
+    assert(last <= GUEST_ADDR_MAX);
     /* Only set PAGE_ANON with new mappings. */
     assert(!(flags & PAGE_ANON) || (flags & PAGE_RESET));
     assert_memory_lock();
 
-    start = start & TARGET_PAGE_MASK;
-    end = TARGET_PAGE_ALIGN(end);
-    last = end - 1;
+    start &= TARGET_PAGE_MASK;
+    last |= ~TARGET_PAGE_MASK;
 
     if (!(flags & PAGE_VALID)) {
         flags = 0;
@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
     }
 
     if (!flags || reset) {
-        page_reset_target_data(start, end);
+        page_reset_target_data(start, last + 1);
         inval_tb |= pageflags_unset(start, last);
     }
     if (flags) {
@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
                                         ~(reset ? 0 : PAGE_STICKY));
     }
     if (inval_tb) {
-        tb_invalidate_phys_range(start, end);
+        tb_invalidate_phys_range(start, last + 1);
     }
 }
 
diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index XXXXXXX..XXXXXXX 100644
--- a/bsd-user/mmap.c
+++ b/bsd-user/mmap.c
@@ -XXX,XX +XXX,XX @@ int target_mprotect(abi_ulong start, abi_ulong len, int prot)
         if (ret != 0)
             goto error;
     }
-    page_set_flags(start, start + len, prot | PAGE_VALID);
+    page_set_flags(start, start + len - 1, prot | PAGE_VALID);
     mmap_unlock();
     return 0;
 error:
@@ -XXX,XX +XXX,XX @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
         }
     }
  the_end1:
-    page_set_flags(start, start + len, prot | PAGE_VALID);
+    page_set_flags(start, start + len - 1, prot | PAGE_VALID);
  the_end:
 #ifdef DEBUG_MMAP
     printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
@@ -XXX,XX +XXX,XX @@ int target_munmap(abi_ulong start, abi_ulong len)
     }
 
     if (ret == 0) {
-        page_set_flags(start, start + len, 0);
+        page_set_flags(start, start + len - 1, 0);
     }
     mmap_unlock();
     return ret;
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
         exit(EXIT_FAILURE);
     }
     page_set_flags(TARGET_VSYSCALL_PAGE,
-                   TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE,
+                   TARGET_VSYSCALL_PAGE | ~TARGET_PAGE_MASK,
                    PAGE_EXEC | PAGE_VALID);
     return true;
 }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
         exit(EXIT_FAILURE);
     }
 
-    page_set_flags(commpage, commpage + qemu_host_page_size,
+    page_set_flags(commpage, commpage | ~qemu_host_page_mask,
                    PAGE_READ | PAGE_EXEC | PAGE_VALID);
     return true;
 }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
         exit(EXIT_FAILURE);
     }
 
-    page_set_flags(LO_COMMPAGE, LO_COMMPAGE + TARGET_PAGE_SIZE,
+    page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
                    PAGE_READ | PAGE_EXEC | PAGE_VALID);
     return true;
 }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
      * and implement syscalls.  Here, simply mark the page executable.
      * Special case the entry points during translation (see do_page_zero).
      */
-    page_set_flags(LO_COMMPAGE, LO_COMMPAGE + TARGET_PAGE_SIZE,
+    page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
                    PAGE_EXEC | PAGE_VALID);
     return true;
 }
@@ -XXX,XX +XXX,XX @@ static void zero_bss(abi_ulong elf_bss, abi_ulong last_bss, int prot)
 
     /* Ensure that the bss page(s) are valid */
     if ((page_get_flags(last_bss-1) & prot) != prot) {
-        page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss, prot | PAGE_VALID);
+        page_set_flags(elf_bss & TARGET_PAGE_MASK, last_bss - 1,
+                       prot | PAGE_VALID);
     }
 
     if (host_start < host_map_start) {
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -XXX,XX +XXX,XX @@ int target_mprotect(abi_ulong start, abi_ulong len, int target_prot)
         }
     }
 
-    page_set_flags(start, start + len, page_flags);
+    page_set_flags(start, start + len - 1, page_flags);
     ret = 0;
 
 error:
@@ -XXX,XX +XXX,XX @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
     }
     page_flags |= PAGE_RESET;
     if (passthrough_start == passthrough_end) {
-        page_set_flags(start, start + len, page_flags);
+        page_set_flags(start, start + len - 1, page_flags);
     } else {
         if (start < passthrough_start) {
-            page_set_flags(start, passthrough_start, page_flags);
+            page_set_flags(start, passthrough_start - 1, page_flags);
         }
-        page_set_flags(passthrough_start, passthrough_end,
+        page_set_flags(passthrough_start, passthrough_end - 1,
                        page_flags | PAGE_PASSTHROUGH);
         if (passthrough_end < start + len) {
-            page_set_flags(passthrough_end, start + len, page_flags);
+            page_set_flags(passthrough_end, start + len - 1, page_flags);
         }
     }
  the_end:
@@ -XXX,XX +XXX,XX @@ int target_munmap(abi_ulong start, abi_ulong len)
     }
 
     if (ret == 0) {
-        page_set_flags(start, start + len, 0);
+        page_set_flags(start, start + len - 1, 0);
     }
     mmap_unlock();
     return ret;
@@ -XXX,XX +XXX,XX @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
     } else {
         new_addr = h2g(host_addr);
         prot = page_get_flags(old_addr);
-        page_set_flags(old_addr, old_addr + old_size, 0);
-        page_set_flags(new_addr, new_addr + new_size,
+        page_set_flags(old_addr, old_addr + old_size - 1, 0);
+        page_set_flags(new_addr, new_addr + new_size - 1,
                        prot | PAGE_VALID | PAGE_RESET);
     }
     mmap_unlock();
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -XXX,XX +XXX,XX @@ static inline abi_ulong do_shmat(CPUArchState *cpu_env,
     }
     raddr=h2g((unsigned long)host_raddr);
 
-    page_set_flags(raddr, raddr + shm_info.shm_segsz,
+    page_set_flags(raddr, raddr + shm_info.shm_segsz - 1,
                    PAGE_VALID | PAGE_RESET | PAGE_READ |
                    (shmflg & SHM_RDONLY ? 0 : PAGE_WRITE));
 
@@ -XXX,XX +XXX,XX @@ static inline abi_long do_shmdt(abi_ulong shmaddr)
     for (i = 0; i < N_SHM_REGIONS; ++i) {
         if (shm_regions[i].in_use && shm_regions[i].start == shmaddr) {
             shm_regions[i].in_use = false;
-            page_set_flags(shmaddr, shmaddr + shm_regions[i].size, 0);
+            page_set_flags(shmaddr, shmaddr + shm_regions[i].size - 1, 0);
             break;
         }
     }
-- 
2.34.1

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/cpu-all.h |  2 +-
 accel/tcg/user-exec.c  | 11 +++++------
 linux-user/mmap.c      |  2 +-
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index XXXXXXX..XXXXXXX 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -XXX,XX +XXX,XX @@ int walk_memory_regions(void *, walk_memory_regions_fn);
 
 int page_get_flags(target_ulong address);
 void page_set_flags(target_ulong start, target_ulong last, int flags);
-void page_reset_target_data(target_ulong start, target_ulong end);
+void page_reset_target_data(target_ulong start, target_ulong last);
 int page_check_range(target_ulong start, target_ulong len, int flags);
 
 /**
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong last, int flags)
     }
 
     if (!flags || reset) {
-        page_reset_target_data(start, last + 1);
+        page_reset_target_data(start, last);
         inval_tb |= pageflags_unset(start, last);
     }
     if (flags) {
@@ -XXX,XX +XXX,XX @@ typedef struct TargetPageDataNode {
 
 static IntervalTreeRoot targetdata_root;
 
-void page_reset_target_data(target_ulong start, target_ulong end)
+void page_reset_target_data(target_ulong start, target_ulong last)
 {
     IntervalTreeNode *n, *next;
-    target_ulong last;
 
     assert_memory_lock();
 
-    start = start & TARGET_PAGE_MASK;
-    last = TARGET_PAGE_ALIGN(end) - 1;
+    start &= TARGET_PAGE_MASK;
+    last |= ~TARGET_PAGE_MASK;
 
     for (n = interval_tree_iter_first(&targetdata_root, start, last),
          next = n ? interval_tree_iter_next(n, start, last) : NULL;
@@ -XXX,XX +XXX,XX @@ void *page_get_target_data(target_ulong address)
     return t->data[(page - region) >> TARGET_PAGE_BITS];
 }
 #else
-void page_reset_target_data(target_ulong start, target_ulong end) { }
+void page_reset_target_data(target_ulong start, target_ulong last) { }
 #endif /* TARGET_PAGE_DATA_SIZE */
 
 /* The softmmu versions of these helpers are in cputlb.c.  */
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -XXX,XX +XXX,XX @@ abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
         if (can_passthrough_madvise(start, end)) {
             ret = get_errno(madvise(g2h_untagged(start), len, advice));
             if ((advice == MADV_DONTNEED) && (ret == 0)) {
-                page_reset_target_data(start, start + len);
+                page_reset_target_data(start, start + len - 1);
             }
         }
     }
-- 
2.34.1

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/tb-maint.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -XXX,XX +XXX,XX @@ static void tb_remove(TranslationBlock *tb)
 }
 
 /* TODO: For now, still shared with translate-all.c for system mode. */
-#define PAGE_FOR_EACH_TB(start, end, pagedesc, T, N)    \
-    for (T = foreach_tb_first(start, end),              \
-         N = foreach_tb_next(T, start, end);            \
+#define PAGE_FOR_EACH_TB(start, last, pagedesc, T, N)   \
+    for (T = foreach_tb_first(start, last),             \
+         N = foreach_tb_next(T, start, last);           \
          T != NULL;                                     \
-         T = N, N = foreach_tb_next(N, start, end))
+         T = N, N = foreach_tb_next(N, start, last))
 
 typedef TranslationBlock *PageForEachNext;
 
 static PageForEachNext foreach_tb_first(tb_page_addr_t start,
-                                        tb_page_addr_t end)
+                                        tb_page_addr_t last)
 {
-    IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, end - 1);
+    IntervalTreeNode *n = interval_tree_iter_first(&tb_root, start, last);
     return n ? container_of(n, TranslationBlock, itree) : NULL;
 }
 
 static PageForEachNext foreach_tb_next(PageForEachNext tb,
                                        tb_page_addr_t start,
-                                       tb_page_addr_t end)
+                                       tb_page_addr_t last)
 {
     IntervalTreeNode *n;
 
     if (tb) {
-        n = interval_tree_iter_next(&tb->itree, start, end - 1);
+        n = interval_tree_iter_next(&tb->itree, start, last);
         if (n) {
             return container_of(n, TranslationBlock, itree);
         }
@@ -XXX,XX +XXX,XX @@ struct page_collection {
 };
 
 typedef int PageForEachNext;
-#define PAGE_FOR_EACH_TB(start, end, pagedesc, tb, n) \
+#define PAGE_FOR_EACH_TB(start, last, pagedesc, tb, n) \
     TB_FOR_EACH_TAGGED((pagedesc)->first_tb, tb, n, page_next)
 
 #ifdef CONFIG_DEBUG_TCG
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
 {
     TranslationBlock *tb;
     PageForEachNext n;
+    tb_page_addr_t last = end - 1;
 
     assert_memory_lock();
 
-    PAGE_FOR_EACH_TB(start, end, unused, tb, n) {
+    PAGE_FOR_EACH_TB(start, last, unused, tb, n) {
         tb_phys_invalidate__locked(tb);
     }
 }
@@ -XXX,XX +XXX,XX @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
     bool current_tb_modified;
     TranslationBlock *tb;
     PageForEachNext n;
+    tb_page_addr_t last;
 
     /*
      * Without precise smc semantics, or when outside of a TB,
@@ -XXX,XX +XXX,XX @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
     assert_memory_lock();
     current_tb = tcg_tb_lookup(pc);
 
+    last = addr | ~TARGET_PAGE_MASK;
     addr &= TARGET_PAGE_MASK;
     current_tb_modified = false;
 
-    PAGE_FOR_EACH_TB(addr, addr + TARGET_PAGE_SIZE, unused, tb, n) {
+    PAGE_FOR_EACH_TB(addr, last, unused, tb, n) {
         if (current_tb == tb &&
             (tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
             /*
@@ -XXX,XX +XXX,XX @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
     bool current_tb_modified = false;
     TranslationBlock *current_tb = retaddr ? tcg_tb_lookup(retaddr) : NULL;
 #endif /* TARGET_HAS_PRECISE_SMC */
+    tb_page_addr_t last G_GNUC_UNUSED = end - 1;
 
     /*
      * We remove all the TBs in the range [start, end[.
      * XXX: see if in some cases it could be faster to invalidate all the code
      */
-    PAGE_FOR_EACH_TB(start, end, p, tb, n) {
+    PAGE_FOR_EACH_TB(start, last, p, tb, n) {
         /* NOTE: this is subtle as a TB may span two physical pages */
         if (n == 0) {
             /* NOTE: tb_end may be after the end of the page, but
-- 
2.34.1

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Fixes a bug in the loop comparision where "<= end" would lock
one more page than required.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/tb-maint.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -XXX,XX +XXX,XX @@ static gint tb_page_addr_cmp(gconstpointer ap, gconstpointer bp, gpointer udata)
 }
 
 /*
- * Lock a range of pages ([@start,@end[) as well as the pages of all
+ * Lock a range of pages ([@start,@last]) as well as the pages of all
  * intersecting TBs.
  * Locking order: acquire locks in ascending order of page index.
  */
 static struct page_collection *page_collection_lock(tb_page_addr_t start,
-                                                    tb_page_addr_t end)
+                                                    tb_page_addr_t last)
 {
     struct page_collection *set = g_malloc(sizeof(*set));
     tb_page_addr_t index;
     PageDesc *pd;
 
     start >>= TARGET_PAGE_BITS;
-    end   >>= TARGET_PAGE_BITS;
-    g_assert(start <= end);
+    last >>= TARGET_PAGE_BITS;
+    g_assert(start <= last);
 
     set->tree = q_tree_new_full(tb_page_addr_cmp, NULL, NULL,
                                 page_entry_destroy);
@@ -XXX,XX +XXX,XX @@ static struct page_collection *page_collection_lock(tb_page_addr_t start,
  retry:
     q_tree_foreach(set->tree, page_entry_lock, NULL);
 
-    for (index = start; index <= end; index++) {
+    for (index = start; index <= last; index++) {
         TranslationBlock *tb;
         PageForEachNext n;
 
@@ -XXX,XX +XXX,XX @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages,
 void tb_invalidate_phys_page(tb_page_addr_t addr)
 {
     struct page_collection *pages;
-    tb_page_addr_t start, end;
+    tb_page_addr_t start, last;
     PageDesc *p;
 
     p = page_find(addr >> TARGET_PAGE_BITS);
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
     }
 
     start = addr & TARGET_PAGE_MASK;
-    end = start + TARGET_PAGE_SIZE;
-    pages = page_collection_lock(start, end);
-    tb_invalidate_phys_page_range__locked(pages, p, start, end, 0);
+    last = addr | ~TARGET_PAGE_MASK;
+    pages = page_collection_lock(start, last);
+    tb_invalidate_phys_page_range__locked(pages, p, start, last + 1, 0);
     page_collection_unlock(pages);
 }
 
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
     struct page_collection *pages;
     tb_page_addr_t next;
 
-    pages = page_collection_lock(start, end);
+    pages = page_collection_lock(start, end - 1);
     for (next = (start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
          start < end;
          start = next, next += TARGET_PAGE_SIZE) {
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range_fast(ram_addr_t ram_addr,
 {
     struct page_collection *pages;
 
-    pages = page_collection_lock(ram_addr, ram_addr + size);
+    pages = page_collection_lock(ram_addr, ram_addr + size - 1);
     tb_invalidate_phys_page_fast__locked(pages, ram_addr, size, retaddr);
     page_collection_unlock(pages);
 }
-- 
2.34.1

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Properly truncate tb_last to the end of the page; the comment about
tb_end being past the end of the page being ok is not correct,
considering overflow.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/tb-maint.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -XXX,XX +XXX,XX @@ bool tb_invalidate_phys_page_unwind(tb_page_addr_t addr, uintptr_t pc)
 static void
 tb_invalidate_phys_page_range__locked(struct page_collection *pages,
                                       PageDesc *p, tb_page_addr_t start,
-                                      tb_page_addr_t end,
+                                      tb_page_addr_t last,
                                       uintptr_t retaddr)
 {
     TranslationBlock *tb;
-    tb_page_addr_t tb_start, tb_end;
     PageForEachNext n;
 #ifdef TARGET_HAS_PRECISE_SMC
     bool current_tb_modified = false;
     TranslationBlock *current_tb = retaddr ? tcg_tb_lookup(retaddr) : NULL;
 #endif /* TARGET_HAS_PRECISE_SMC */
-    tb_page_addr_t last G_GNUC_UNUSED = end - 1;
 
     /*
-     * We remove all the TBs in the range [start, end[.
+     * We remove all the TBs in the range [start, last].
      * XXX: see if in some cases it could be faster to invalidate all the code
      */
     PAGE_FOR_EACH_TB(start, last, p, tb, n) {
+        tb_page_addr_t tb_start, tb_last;
+
         /* NOTE: this is subtle as a TB may span two physical pages */
+        tb_start = tb_page_addr0(tb);
+        tb_last = tb_start + tb->size - 1;
         if (n == 0) {
-            /* NOTE: tb_end may be after the end of the page, but
-               it is not a problem */
-            tb_start = tb_page_addr0(tb);
-            tb_end = tb_start + tb->size;
+            tb_last = MIN(tb_last, tb_start | ~TARGET_PAGE_MASK);
         } else {
             tb_start = tb_page_addr1(tb);
-            tb_end = tb_start + ((tb_page_addr0(tb) + tb->size)
-                                 & ~TARGET_PAGE_MASK);
+            tb_last = tb_start + (tb_last & ~TARGET_PAGE_MASK);
         }
-        if (!(tb_end <= start || tb_start >= end)) {
+        if (!(tb_last < start || tb_start > last)) {
 #ifdef TARGET_HAS_PRECISE_SMC
             if (current_tb == tb &&
                 (tb_cflags(current_tb) & CF_COUNT_MASK) != 1) {
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
     start = addr & TARGET_PAGE_MASK;
     last = addr | ~TARGET_PAGE_MASK;
     pages = page_collection_lock(start, last);
-    tb_invalidate_phys_page_range__locked(pages, p, start, last + 1, 0);
+    tb_invalidate_phys_page_range__locked(pages, p, start, last, 0);
     page_collection_unlock(pages);
 }
 
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
             continue;
         }
         assert_page_locked(pd);
-        tb_invalidate_phys_page_range__locked(pages, pd, start, bound, 0);
+        tb_invalidate_phys_page_range__locked(pages, pd, start, bound - 1, 0);
     }
     page_collection_unlock(pages);
 }
@@ -XXX,XX +XXX,XX @@ static void tb_invalidate_phys_page_fast__locked(struct page_collection *pages,
     }
 
     assert_page_locked(p);
-    tb_invalidate_phys_page_range__locked(pages, p, start, start + len, ra);
+    tb_invalidate_phys_page_range__locked(pages, p, start, start + len - 1, ra);
 }
 
 /*
-- 
2.34.1

Pass the address of the last byte to be changed, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/exec-all.h   |  2 +-
 accel/tcg/tb-maint.c      | 31 ++++++++++++++++---------------
 accel/tcg/translate-all.c |  2 +-
 accel/tcg/user-exec.c     |  2 +-
 softmmu/physmem.c         |  2 +-
 5 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index XXXXXXX..XXXXXXX 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_addr(target_ulong addr);
 void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr, MemTxAttrs attrs);
 #endif
 void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end);
+void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last);
 void tb_set_jmp_target(TranslationBlock *tb, int n, uintptr_t addr);
 
 /* GETPC is the true target of the return instruction that we'll execute.  */
diff --git a/accel/tcg/tb-maint.c b/accel/tcg/tb-maint.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/tb-maint.c
+++ b/accel/tcg/tb-maint.c
@@ -XXX,XX +XXX,XX @@ TranslationBlock *tb_link_page(TranslationBlock *tb, tb_page_addr_t phys_pc,
  * Called with mmap_lock held for user-mode emulation.
  * NOTE: this function must not be called while a TB is running.
  */
-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
+void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last)
 {
     TranslationBlock *tb;
     PageForEachNext n;
-    tb_page_addr_t last = end - 1;
 
     assert_memory_lock();
 
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
  */
 void tb_invalidate_phys_page(tb_page_addr_t addr)
 {
-    tb_page_addr_t start, end;
+    tb_page_addr_t start, last;
 
     start = addr & TARGET_PAGE_MASK;
-    end = start + TARGET_PAGE_SIZE;
-    tb_invalidate_phys_range(start, end);
+    last = addr | ~TARGET_PAGE_MASK;
+    tb_invalidate_phys_range(start, last);
 }
 
 /*
@@ -XXX,XX +XXX,XX @@ void tb_invalidate_phys_page(tb_page_addr_t addr)
 
 /*
  * Invalidate all TBs which intersect with the target physical address range
- * [start;end[. NOTE: start and end may refer to *different* physical pages.
+ * [start;last]. NOTE: start and end may refer to *different* physical pages.
  * 'is_cpu_write_access' should be true if called from a real cpu write
  * access: the virtual CPU will exit the current TB if code is modified inside
  * this TB.
  */
-void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end)
+void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t last)
 {
     struct page_collection *pages;
-    tb_page_addr_t next;
+    tb_page_addr_t index, index_last;
 
-    pages = page_collection_lock(start, end - 1);
-    for (next = (start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
-         start < end;
-         start = next, next += TARGET_PAGE_SIZE) {
-        PageDesc *pd = page_find(start >> TARGET_PAGE_BITS);
-        tb_page_addr_t bound = MIN(next, end);
+    pages = page_collection_lock(start, last);
+
+    index_last = last >> TARGET_PAGE_BITS;
+    for (index = start >> TARGET_PAGE_BITS; index <= index_last; index++) {
+        PageDesc *pd = page_find(index);
+        tb_page_addr_t bound;
 
         if (pd == NULL) {
             continue;
         }
         assert_page_locked(pd);
-        tb_invalidate_phys_page_range__locked(pages, pd, start, bound - 1, 0);
+        bound = (index << TARGET_PAGE_BITS) | ~TARGET_PAGE_MASK;
+        bound = MIN(bound, last);
+        tb_invalidate_phys_page_range__locked(pages, pd, start, bound, 0);
     }
     page_collection_unlock(pages);
 }
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -XXX,XX +XXX,XX @@ void tb_check_watchpoint(CPUState *cpu, uintptr_t retaddr)
         cpu_get_tb_cpu_state(env, &pc, &cs_base, &flags);
         addr = get_page_addr_code(env, pc);
         if (addr != -1) {
-            tb_invalidate_phys_range(addr, addr + 1);
+            tb_invalidate_phys_range(addr, addr);
         }
     }
 }
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index XXXXXXX..XXXXXXX 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -XXX,XX +XXX,XX @@ void page_set_flags(target_ulong start, target_ulong last, int flags)
                                         ~(reset ? 0 : PAGE_STICKY));
     }
     if (inval_tb) {
-        tb_invalidate_phys_range(start, last + 1);
+        tb_invalidate_phys_range(start, last);
     }
 }
 
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index XXXXXXX..XXXXXXX 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -XXX,XX +XXX,XX @@ static void invalidate_and_set_dirty(MemoryRegion *mr, hwaddr addr,
     }
     if (dirty_log_mask & (1 << DIRTY_MEMORY_CODE)) {
         assert(tcg_enabled());
-        tb_invalidate_phys_range(addr, addr + length);
+        tb_invalidate_phys_range(addr, addr + length - 1);
         dirty_log_mask &= ~(1 << DIRTY_MEMORY_CODE);
     }
     cpu_physical_memory_set_dirty_range(addr, length, dirty_log_mask);
-- 
2.34.1

Pass the address of the last byte of the image, rather than
the first address past the last byte.  This avoids overflow
when the last page of the address space is involved.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/user-internals.h | 12 ++++++------
 linux-user/elfload.c        | 24 ++++++++++++------------
 linux-user/flatload.c       |  2 +-
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/linux-user/user-internals.h b/linux-user/user-internals.h
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/user-internals.h
+++ b/linux-user/user-internals.h
@@ -XXX,XX +XXX,XX @@ void fork_end(int child);
 /**
  * probe_guest_base:
  * @image_name: the executable being loaded
- * @loaddr: the lowest fixed address in the executable
- * @hiaddr: the highest fixed address in the executable
+ * @loaddr: the lowest fixed address within the executable
+ * @hiaddr: the highest fixed address within the executable
  *
  * Creates the initial guest address space in the host memory space.
  *
- * If @loaddr == 0, then no address in the executable is fixed,
- * i.e. it is fully relocatable.  In that case @hiaddr is the size
- * of the executable.
+ * If @loaddr == 0, then no address in the executable is fixed, i.e.
+ * it is fully relocatable.  In that case @hiaddr is the size of the
+ * executable minus one.
  *
  * This function will not return if a valid value for guest_base
  * cannot be chosen.  On return, the executable loader can expect
  *
- *    target_mmap(loaddr, hiaddr - loaddr, ...)
+ *    target_mmap(loaddr, hiaddr - loaddr + 1, ...)
  *
  * to succeed.
  */
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
         if (guest_hiaddr > reserved_va) {
             error_report("%s: requires more than reserved virtual "
                          "address space (0x%" PRIx64 " > 0x%lx)",
-                         image_name, (uint64_t)guest_hiaddr, reserved_va);
+                         image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
             exit(EXIT_FAILURE);
         }
     } else {
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
         if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) {
             error_report("%s: requires more virtual address space "
                          "than the host can provide (0x%" PRIx64 ")",
-                         image_name, (uint64_t)guest_hiaddr - guest_base);
+                         image_name, (uint64_t)guest_hiaddr + 1 - guest_base);
             exit(EXIT_FAILURE);
         }
 #endif
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
     if (reserved_va) {
         guest_loaddr = (guest_base >= mmap_min_addr ? 0
                         : mmap_min_addr - guest_base);
-        guest_hiaddr = reserved_va;
+        guest_hiaddr = reserved_va - 1;
     }
 
     /* Reserve the address space for the binary, or reserved_va. */
     test = g2h_untagged(guest_loaddr);
-    addr = mmap(test, guest_hiaddr - guest_loaddr, PROT_NONE, flags, -1, 0);
+    addr = mmap(test, guest_hiaddr - guest_loaddr + 1, PROT_NONE, flags, -1, 0);
     if (test != addr) {
         pgb_fail_in_use(image_name);
     }
     qemu_log_mask(CPU_LOG_PAGE,
-                  "%s: base @ %p for " TARGET_ABI_FMT_ld " bytes\n",
-                  __func__, addr, guest_hiaddr - guest_loaddr);
+                  "%s: base @ %p for %" PRIu64 " bytes\n",
+                  __func__, addr, (uint64_t)guest_hiaddr - guest_loaddr + 1);
 }
 
 /**
@@ -XXX,XX +XXX,XX @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr,
     if (hiaddr != orig_hiaddr) {
         error_report("%s: requires virtual address space that the "
                      "host cannot provide (0x%" PRIx64 ")",
-                     image_name, (uint64_t)orig_hiaddr);
+                     image_name, (uint64_t)orig_hiaddr + 1);
         exit(EXIT_FAILURE);
     }
 
@@ -XXX,XX +XXX,XX @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr,
          * arithmetic wraps around.
          */
         if (sizeof(uintptr_t) == 8 || loaddr >= 0x80000000u) {
-            hiaddr = (uintptr_t) 4 << 30;
+            hiaddr = UINT32_MAX;
         } else {
             offset = -(HI_COMMPAGE & -align);
         }
@@ -XXX,XX +XXX,XX @@ static void pgb_static(const char *image_name, abi_ulong orig_loaddr,
         loaddr = MIN(loaddr, LO_COMMPAGE & -align);
     }
 
-    addr = pgb_find_hole(loaddr, hiaddr - loaddr, align, offset);
+    addr = pgb_find_hole(loaddr, hiaddr - loaddr + 1, align, offset);
     if (addr == -1) {
         /*
          * If HI_COMMPAGE, there *might* be a non-consecutive allocation
@@ -XXX,XX +XXX,XX @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr,
     if (guest_hiaddr > reserved_va) {
         error_report("%s: requires more than reserved virtual "
                      "address space (0x%" PRIx64 " > 0x%lx)",
-                     image_name, (uint64_t)guest_hiaddr, reserved_va);
+                     image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
         exit(EXIT_FAILURE);
     }
 
@@ -XXX,XX +XXX,XX @@ static void load_elf_image(const char *image_name, int image_fd,
             if (a < loaddr) {
                 loaddr = a;
             }
-            a = eppnt->p_vaddr + eppnt->p_memsz;
+            a = eppnt->p_vaddr + eppnt->p_memsz - 1;
             if (a > hiaddr) {
                 hiaddr = a;
             }
@@ -XXX,XX +XXX,XX @@ static void load_elf_image(const char *image_name, int image_fd,
      * In both cases, we will overwrite pages in this range with mappings
      * from the executable.
      */
-    load_addr = target_mmap(loaddr, hiaddr - loaddr, PROT_NONE,
+    load_addr = target_mmap(loaddr, (size_t)hiaddr - loaddr + 1, PROT_NONE,
                             MAP_PRIVATE | MAP_ANON | MAP_NORESERVE |
                             (ehdr->e_type == ET_EXEC ? MAP_FIXED : 0),
                             -1, 0);
diff --git a/linux-user/flatload.c b/linux-user/flatload.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/flatload.c
+++ b/linux-user/flatload.c
@@ -XXX,XX +XXX,XX @@ static int load_flat_file(struct linux_binprm * bprm,
      * Allocate the address space.
      */
     probe_guest_base(bprm->filename, 0,
-                     text_len + data_len + extra + indx_len);
+                     text_len + data_len + extra + indx_len - 1);
 
     /*
      * there are a couple of cases here,  the separate code/data
-- 
2.34.1

Change the semantics to be the last byte of the guest va, rather
than the following byte.  This avoids some overflow conditions.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/exec/cpu-all.h      | 11 ++++++++++-
 linux-user/arm/target_cpu.h |  2 +-
 bsd-user/main.c             | 10 +++-------
 bsd-user/mmap.c             |  4 ++--
 linux-user/elfload.c        | 14 +++++++-------
 linux-user/main.c           | 27 +++++++++++++--------------
 linux-user/mmap.c           |  4 ++--
 7 files changed, 38 insertions(+), 34 deletions(-)

diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index XXXXXXX..XXXXXXX 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -XXX,XX +XXX,XX @@ static inline void tswap64s(uint64_t *s)
  */
 extern uintptr_t guest_base;
 extern bool have_guest_base;
+
+/*
+ * If non-zero, the guest virtual address space is a contiguous subset
+ * of the host virtual address space, i.e. '-R reserved_va' is in effect
+ * either from the command-line or by default.  The value is the last
+ * byte of the guest address space e.g. UINT32_MAX.
+ *
+ * If zero, the host and guest virtual address spaces are intermingled.
+ */
 extern unsigned long reserved_va;
 
 /*
@@ -XXX,XX +XXX,XX @@ extern unsigned long reserved_va;
 #define GUEST_ADDR_MAX_                                                 \
     ((MIN_CONST(TARGET_VIRT_ADDR_SPACE_BITS, TARGET_ABI_BITS) <= 32) ?  \
      UINT32_MAX : ~0ul)
-#define GUEST_ADDR_MAX    (reserved_va ? reserved_va - 1 : GUEST_ADDR_MAX_)
+#define GUEST_ADDR_MAX    (reserved_va ? : GUEST_ADDR_MAX_)
 
 #else
 
diff --git a/linux-user/arm/target_cpu.h b/linux-user/arm/target_cpu.h
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/arm/target_cpu.h
+++ b/linux-user/arm/target_cpu.h
@@ -XXX,XX +XXX,XX @@ static inline unsigned long arm_max_reserved_va(CPUState *cs)
          * the high addresses.  Restrict linux-user to the
          * cached write-back RAM in the system map.
          */
-        return 0x80000000ul;
+        return 0x7ffffffful;
     } else {
         /*
          * We need to be able to map the commpage.
diff --git a/bsd-user/main.c b/bsd-user/main.c
index XXXXXXX..XXXXXXX 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -XXX,XX +XXX,XX @@ bool have_guest_base;
 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
 #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
       (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
-/*
- * There are a number of places where we assign reserved_va to a variable
- * of type abi_ulong and expect it to fit.  Avoid the last page.
- */
-#   define MAX_RESERVED_VA  (0xfffffffful & TARGET_PAGE_MASK)
+#   define MAX_RESERVED_VA  0xfffffffful
 #  else
-#   define MAX_RESERVED_VA  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
+#   define MAX_RESERVED_VA  ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
 #  endif
 # else
 #  define MAX_RESERVED_VA  0
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv)
     envlist_free(envlist);
 
     if (reserved_va) {
-            mmap_next_start = reserved_va;
+        mmap_next_start = reserved_va + 1;
     }
 
     {
diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index XXXXXXX..XXXXXXX 100644
--- a/bsd-user/mmap.c
+++ b/bsd-user/mmap.c
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
     size = HOST_PAGE_ALIGN(size) + alignment;
     end_addr = start + size;
     if (end_addr > reserved_va) {
-        end_addr = reserved_va;
+        end_addr = reserved_va + 1;
     }
     addr = end_addr - qemu_host_page_size;
 
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
             if (looped) {
                 return (abi_ulong)-1;
             }
-            end_addr = reserved_va;
+            end_addr = reserved_va + 1;
             addr = end_addr - qemu_host_page_size;
             looped = 1;
             continue;
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
      * has specified -R reserved_va, which would trigger an assert().
      */
     if (reserved_va != 0 &&
-        TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE >= reserved_va) {
+        TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE - 1 > reserved_va) {
         error_report("Cannot allocate vsyscall page");
         exit(EXIT_FAILURE);
     }
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
         if (guest_hiaddr > reserved_va) {
             error_report("%s: requires more than reserved virtual "
                          "address space (0x%" PRIx64 " > 0x%lx)",
-                         image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
+                         image_name, (uint64_t)guest_hiaddr, reserved_va);
             exit(EXIT_FAILURE);
         }
     } else {
@@ -XXX,XX +XXX,XX @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr,
     if (reserved_va) {
         guest_loaddr = (guest_base >= mmap_min_addr ? 0
                         : mmap_min_addr - guest_base);
-        guest_hiaddr = reserved_va - 1;
+        guest_hiaddr = reserved_va;
     }
 
     /* Reserve the address space for the binary, or reserved_va. */
@@ -XXX,XX +XXX,XX @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr,
     if (guest_hiaddr > reserved_va) {
         error_report("%s: requires more than reserved virtual "
                      "address space (0x%" PRIx64 " > 0x%lx)",
-                     image_name, (uint64_t)guest_hiaddr + 1, reserved_va);
+                     image_name, (uint64_t)guest_hiaddr, reserved_va);
         exit(EXIT_FAILURE);
     }
 
@@ -XXX,XX +XXX,XX @@ static void pgb_reserved_va(const char *image_name, abi_ulong guest_loaddr,
     /* Reserve the memory on the host. */
     assert(guest_base != 0);
     test = g2h_untagged(0);
-    addr = mmap(test, reserved_va, PROT_NONE, flags, -1, 0);
+    addr = mmap(test, reserved_va + 1, PROT_NONE, flags, -1, 0);
     if (addr == MAP_FAILED || addr != test) {
         error_report("Unable to reserve 0x%lx bytes of virtual address "
                      "space at %p (%s) for use as guest address space (check your "
                      "virtual memory ulimit setting, min_mmap_addr or reserve less "
-                     "using -R option)", reserved_va, test, strerror(errno));
+                     "using -R option)", reserved_va + 1, test, strerror(errno));
         exit(EXIT_FAILURE);
     }
 
     qemu_log_mask(CPU_LOG_PAGE, "%s: base @ %p for %lu bytes\n",
-                  __func__, addr, reserved_va);
+                  __func__, addr, reserved_va + 1);
 }
 
 void probe_guest_base(const char *image_name, abi_ulong guest_loaddr,
diff --git a/linux-user/main.c b/linux-user/main.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -XXX,XX +XXX,XX @@ static const char *last_log_filename;
 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
 #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
       (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
-/* There are a number of places where we assign reserved_va to a variable
-   of type abi_ulong and expect it to fit.  Avoid the last page.  */
-#   define MAX_RESERVED_VA(CPU)  (0xfffffffful & TARGET_PAGE_MASK)
+#   define MAX_RESERVED_VA(CPU)  0xfffffffful
 #  else
-#   define MAX_RESERVED_VA(CPU)  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
+#   define MAX_RESERVED_VA(CPU)  ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
 #  endif
 # else
 #  define MAX_RESERVED_VA(CPU)  0
@@ -XXX,XX +XXX,XX @@ static void handle_arg_reserved_va(const char *arg)
 {
     char *p;
     int shift = 0;
-    reserved_va = strtoul(arg, &p, 0);
+    unsigned long val;
+
+    val = strtoul(arg, &p, 0);
     switch (*p) {
     case 'k':
     case 'K':
@@ -XXX,XX +XXX,XX @@ static void handle_arg_reserved_va(const char *arg)
         break;
     }
     if (shift) {
-        unsigned long unshifted = reserved_va;
+        unsigned long unshifted = val;
         p++;
-        reserved_va <<= shift;
-        if (reserved_va >> shift != unshifted) {
+        val <<= shift;
+        if (val >> shift != unshifted) {
             fprintf(stderr, "Reserved virtual address too big\n");
             exit(EXIT_FAILURE);
         }
@@ -XXX,XX +XXX,XX @@ static void handle_arg_reserved_va(const char *arg)
         fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
         exit(EXIT_FAILURE);
     }
+    /* The representation is size - 1, with 0 remaining "default". */
+    reserved_va = val ? val - 1 : 0;
 }
 
 static void handle_arg_singlestep(const char *arg)
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv, char **envp)
      */
     max_reserved_va = MAX_RESERVED_VA(cpu);
     if (reserved_va != 0) {
-        if (reserved_va % qemu_host_page_size) {
+        if ((reserved_va + 1) % qemu_host_page_size) {
             char *s = size_to_str(qemu_host_page_size);
             fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
             g_free(s);
@@ -XXX,XX +XXX,XX @@ int main(int argc, char **argv, char **envp)
             exit(EXIT_FAILURE);
         }
     } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
-        /*
-         * reserved_va must be aligned with the host page size
-         * as it is used with mmap()
-         */
-        reserved_va = max_reserved_va & qemu_host_page_mask;
+        /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */
+        reserved_va = max_reserved_va;
     }
 
     {
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
     end_addr = start + size;
     if (start > reserved_va - size) {
         /* Start at the top of the address space.  */
-        end_addr = ((reserved_va - size) & -align) + size;
+        end_addr = ((reserved_va + 1 - size) & -align) + size;
         looped = true;
     }
 
@@ -XXX,XX +XXX,XX @@ static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
                 return (abi_ulong)-1;
             }
             /* Re-start at the top of the address space.  */
-            addr = end_addr = ((reserved_va - size) & -align) + size;
+            addr = end_addr = ((reserved_va + 1 - size) & -align) + size;
             looped = true;
         } else {
             prot = page_get_flags(addr);
-- 
2.34.1

User setting of -R reserved_va can lead to an assertion
failure in page_set_flags.  Sanity check the value of
reserved_va and print an error message instead.  Do not
allocate a commpage at all for m-profile cpus.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/elfload.c | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index XXXXXXX..XXXXXXX 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -XXX,XX +XXX,XX @@ enum {
 
 static bool init_guest_commpage(void)
 {
-    abi_ptr commpage = HI_COMMPAGE & -qemu_host_page_size;
-    void *want = g2h_untagged(commpage);
-    void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
-                      MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+    ARMCPU *cpu = ARM_CPU(thread_cpu);
+    abi_ptr want = HI_COMMPAGE & TARGET_PAGE_MASK;
+    abi_ptr addr;
 
-    if (addr == MAP_FAILED) {
+    /*
+     * M-profile allocates maximum of 2GB address space, so can never
+     * allocate the commpage.  Skip it.
+     */
+    if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
+        return true;
+    }
+
+    /*
+     * If reserved_va does not cover the commpage, we get an assert
+     * in page_set_flags.  Produce an intelligent error instead.
+     */
+    if (reserved_va != 0 && want + TARGET_PAGE_SIZE - 1 > reserved_va) {
+        error_report("Allocating guest commpage: -R 0x%" PRIx64 " too small",
+                     (uint64_t)reserved_va + 1);
+        exit(EXIT_FAILURE);
+    }
+
+    addr = target_mmap(want, TARGET_PAGE_SIZE, PROT_READ | PROT_WRITE,
+                       MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
+
+    if (addr == -1) {
         perror("Allocating guest commpage");
         exit(EXIT_FAILURE);
     }
@@ -XXX,XX +XXX,XX @@ static bool init_guest_commpage(void)
     }
 
     /* Set kernel helper versions; rest of page is 0.  */
-    __put_user(5, (uint32_t *)g2h_untagged(0xffff0ffcu));
+    put_user_u32(5, 0xffff0ffcu);
 
-    if (mprotect(addr, qemu_host_page_size, PROT_READ)) {
+    if (target_mprotect(addr, qemu_host_page_size, PROT_READ | PROT_EXEC)) {
         perror("Protecting guest commpage");
         exit(EXIT_FAILURE);
     }
-
-    page_set_flags(commpage, commpage | ~qemu_host_page_mask,
-                   PAGE_READ | PAGE_EXEC | PAGE_VALID);
     return true;
 }
 
-- 
2.34.1

From: Philippe Mathieu-Daudé <philmd@linaro.org>

Both cpu_check_watchpoint() and cpu_watchpoint_address_matches()
are specific to TCG system emulation. Declare them in "tcg-cpu-ops.h"
to be sure accessing them from non-TCG code is a compilation error.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230328173117.15226-2-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/hw/core/cpu.h         | 37 ------------------------------
 include/hw/core/tcg-cpu-ops.h | 43 +++++++++++++++++++++++++++++++++++
 target/arm/tcg/mte_helper.c   |  1 +
 target/arm/tcg/sve_helper.c   |  1 +
 target/s390x/tcg/mem_helper.c |  1 +
 5 files changed, 46 insertions(+), 37 deletions(-)

diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index XXXXXXX..XXXXXXX 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -XXX,XX +XXX,XX @@ static inline void cpu_watchpoint_remove_by_ref(CPUState *cpu,
 static inline void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
 {
 }
-
-static inline void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
-                                        MemTxAttrs atr, int fl, uintptr_t ra)
-{
-}
-
-static inline int cpu_watchpoint_address_matches(CPUState *cpu,
-                                                 vaddr addr, vaddr len)
-{
-    return 0;
-}
 #else
 int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
                           int flags, CPUWatchpoint **watchpoint);
@@ -XXX,XX +XXX,XX @@ int cpu_watchpoint_remove(CPUState *cpu, vaddr addr,
                           vaddr len, int flags);
 void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint);
 void cpu_watchpoint_remove_all(CPUState *cpu, int mask);
-
-/**
- * cpu_check_watchpoint:
- * @cpu: cpu context
- * @addr: guest virtual address
- * @len: access length
- * @attrs: memory access attributes
- * @flags: watchpoint access type
- * @ra: unwind return address
- *
- * Check for a watchpoint hit in [addr, addr+len) of the type
- * specified by @flags.  Exit via exception with a hit.
- */
-void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
-                          MemTxAttrs attrs, int flags, uintptr_t ra);
-
-/**
- * cpu_watchpoint_address_matches:
- * @cpu: cpu context
- * @addr: guest virtual address
- * @len: access length
- *
- * Return the watchpoint flags that apply to [addr, addr+len).
- * If no watchpoint is registered for the range, the result is 0.
- */
-int cpu_watchpoint_address_matches(CPUState *cpu, vaddr addr, vaddr len);
 #endif
 
 /**
diff --git a/include/hw/core/tcg-cpu-ops.h b/include/hw/core/tcg-cpu-ops.h
index XXXXXXX..XXXXXXX 100644
--- a/include/hw/core/tcg-cpu-ops.h
+++ b/include/hw/core/tcg-cpu-ops.h
@@ -XXX,XX +XXX,XX @@ struct TCGCPUOps {
 
 };
 
+#if defined(CONFIG_USER_ONLY)
+
+static inline void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
+                                        MemTxAttrs atr, int fl, uintptr_t ra)
+{
+}
+
+static inline int cpu_watchpoint_address_matches(CPUState *cpu,
+                                                 vaddr addr, vaddr len)
+{
+    return 0;
+}
+
+#else
+
+/**
+ * cpu_check_watchpoint:
+ * @cpu: cpu context
+ * @addr: guest virtual address
+ * @len: access length
+ * @attrs: memory access attributes
+ * @flags: watchpoint access type
+ * @ra: unwind return address
+ *
+ * Check for a watchpoint hit in [addr, addr+len) of the type
+ * specified by @flags.  Exit via exception with a hit.
+ */
+void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
+                          MemTxAttrs attrs, int flags, uintptr_t ra);
+
+/**
+ * cpu_watchpoint_address_matches:
+ * @cpu: cpu context
+ * @addr: guest virtual address
+ * @len: access length
+ *
+ * Return the watchpoint flags that apply to [addr, addr+len).
+ * If no watchpoint is registered for the range, the result is 0.
+ */
+int cpu_watchpoint_address_matches(CPUState *cpu, vaddr addr, vaddr len);
+
+#endif
+
 #endif /* TCG_CPU_OPS_H */
diff --git a/target/arm/tcg/mte_helper.c b/target/arm/tcg/mte_helper.c
index XXXXXXX..XXXXXXX 100644
--- a/target/arm/tcg/mte_helper.c
+++ b/target/arm/tcg/mte_helper.c
@@ -XXX,XX +XXX,XX @@
 #include "exec/ram_addr.h"
 #include "exec/cpu_ldst.h"
 #include "exec/helper-proto.h"
+#include "hw/core/tcg-cpu-ops.h"
 #include "qapi/error.h"
 #include "qemu/guest-random.h"
 
diff --git a/target/arm/tcg/sve_helper.c b/target/arm/tcg/sve_helper.c
index XXXXXXX..XXXXXXX 100644
--- a/target/arm/tcg/sve_helper.c
+++ b/target/arm/tcg/sve_helper.c
@@ -XXX,XX +XXX,XX @@
 #include "tcg/tcg.h"
 #include "vec_internal.h"
 #include "sve_ldst_internal.h"
+#include "hw/core/tcg-cpu-ops.h"
 
 
 /* Return a value for NZCV as per the ARM PredTest pseudofunction.
diff --git a/target/s390x/tcg/mem_helper.c b/target/s390x/tcg/mem_helper.c
index XXXXXXX..XXXXXXX 100644
--- a/target/s390x/tcg/mem_helper.c
+++ b/target/s390x/tcg/mem_helper.c
@@ -XXX,XX +XXX,XX @@
 #include "exec/helper-proto.h"
 #include "exec/exec-all.h"
 #include "exec/cpu_ldst.h"
+#include "hw/core/tcg-cpu-ops.h"
 #include "qemu/int128.h"
 #include "qemu/atomic128.h"
 #include "trace.h"
-- 
2.34.1

From: Philippe Mathieu-Daudé <philmd@linaro.org>

cpu_watchpoint_insert() calls error_report() which is declared
in "qemu/error-report.h". When moving this code in commit 2609ec2868
("softmmu: Extract watchpoint API from physmem.c") we neglected to
include this header. This works so far because it is indirectly
included by TCG headers -> "qemu/plugin.h" -> "qemu/error-report.h".

Currently cpu_watchpoint_insert() is only built with the TCG
accelerator. When building it with other ones (or without TCG)
we get:

softmmu/watchpoint.c:38:9: error: implicit declaration of function 'error_report' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        error_report("tried to set invalid watchpoint at %"
        ^

Include "qemu/error-report.h" in order to fix this for non-TCG
builds.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230328173117.15226-3-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 softmmu/watchpoint.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/softmmu/watchpoint.c b/softmmu/watchpoint.c
index XXXXXXX..XXXXXXX 100644
--- a/softmmu/watchpoint.c
+++ b/softmmu/watchpoint.c
@@ -XXX,XX +XXX,XX @@
 
 #include "qemu/osdep.h"
 #include "qemu/main-loop.h"
+#include "qemu/error-report.h"
 #include "exec/exec-all.h"
 #include "exec/translate-all.h"
 #include "sysemu/tcg.h"
-- 
2.34.1

From: Philippe Mathieu-Daudé <philmd@linaro.org>

CPU watchpoints can be use by non-TCG accelerators.

KVM uses them:

$ git grep CPUWatchpoint|fgrep kvm
  target/arm/kvm64.c:1558:        CPUWatchpoint *wp = find_hw_watchpoint(cs, debug_exit->far);
  target/i386/kvm/kvm.c:5216:static CPUWatchpoint hw_watchpoint;
  target/ppc/kvm.c:443:static CPUWatchpoint hw_watchpoint;
  target/s390x/kvm/kvm.c:139:static CPUWatchpoint hw_watchpoint;

See for example commit e4482ab7e3 ("target-arm: kvm - add support
for HW assisted debug"):

This adds basic support for HW assisted debug. The ioctl interface
     to KVM allows us to pass an implementation defined number of break
     and watch point registers. [...]

This partially reverts commit 2609ec2868e6c286e755a73b4504714a0296a.

Fixes: 2609ec2868 ("softmmu: Extract watchpoint API from physmem.c")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230328173117.15226-4-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 include/hw/core/cpu.h | 2 +-
 softmmu/watchpoint.c  | 4 ++++
 softmmu/meson.build   | 2 +-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index XXXXXXX..XXXXXXX 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -XXX,XX +XXX,XX @@ static inline bool cpu_breakpoint_test(CPUState *cpu, vaddr pc, int mask)
     return false;
 }
 
-#if !defined(CONFIG_TCG) || defined(CONFIG_USER_ONLY)
+#if defined(CONFIG_USER_ONLY)
 static inline int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
                                         int flags, CPUWatchpoint **watchpoint)
 {
diff --git a/softmmu/watchpoint.c b/softmmu/watchpoint.c
index XXXXXXX..XXXXXXX 100644
--- a/softmmu/watchpoint.c
+++ b/softmmu/watchpoint.c
@@ -XXX,XX +XXX,XX @@ void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
     }
 }
 
+#ifdef CONFIG_TCG
+
 /*
  * Return true if this watchpoint address matches the specified
  * access (ie the address range covered by the watchpoint overlaps
@@ -XXX,XX +XXX,XX @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
         }
     }
 }
+
+#endif /* CONFIG_TCG */
diff --git a/softmmu/meson.build b/softmmu/meson.build
index XXXXXXX..XXXXXXX 100644
--- a/softmmu/meson.build
+++ b/softmmu/meson.build
@@ -XXX,XX +XXX,XX @@ specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: [files(
   'physmem.c',
   'qtest.c',
   'dirtylimit.c',
+  'watchpoint.c',
 )])
 
 specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: [files(
   'icount.c',
-  'watchpoint.c',
 )])
 
 softmmu_ss.add(files(
-- 
2.34.1