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Subject: [PATCH v4 1/7] hwpoison_page_list and qemu_ram_remap are based on
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Date: Sat, 14 Dec 2024 13:45:49 +0000
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From: William Roche <william.roche@oracle.com>
The list of hwpoison pages used to remap the memory on reset
is based on the backend real page size. When dealing with
hugepages, we create a single entry for the entire page.
Co-developed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: William Roche <william.roche@oracle.com>
---
accel/kvm/kvm-all.c | 6 +++++-
include/exec/cpu-common.h | 3 ++-
system/physmem.c | 32 ++++++++++++++++++++++++++------
3 files changed, 33 insertions(+), 8 deletions(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 801cff16a5..24c0c4ce3f 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -1278,7 +1278,7 @@ static void kvm_unpoison_all(void *param)
=20
QLIST_FOREACH_SAFE(page, &hwpoison_page_list, list, next_page) {
QLIST_REMOVE(page, list);
- qemu_ram_remap(page->ram_addr, TARGET_PAGE_SIZE);
+ qemu_ram_remap(page->ram_addr);
g_free(page);
}
}
@@ -1286,6 +1286,10 @@ static void kvm_unpoison_all(void *param)
void kvm_hwpoison_page_add(ram_addr_t ram_addr)
{
HWPoisonPage *page;
+ size_t page_size =3D qemu_ram_pagesize_from_addr(ram_addr);
+
+ if (page_size > TARGET_PAGE_SIZE)
+ ram_addr =3D QEMU_ALIGN_DOWN(ram_addr, page_size);
=20
QLIST_FOREACH(page, &hwpoison_page_list, list) {
if (page->ram_addr =3D=3D ram_addr) {
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index 638dc806a5..59fbb324fa 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -67,7 +67,7 @@ typedef uintptr_t ram_addr_t;
=20
/* memory API */
=20
-void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
+void qemu_ram_remap(ram_addr_t addr);
/* This should not be used by devices. */
ram_addr_t qemu_ram_addr_from_host(void *ptr);
ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr);
@@ -108,6 +108,7 @@ bool qemu_ram_is_named_file(RAMBlock *rb);
int qemu_ram_get_fd(RAMBlock *rb);
=20
size_t qemu_ram_pagesize(RAMBlock *block);
+size_t qemu_ram_pagesize_from_addr(ram_addr_t addr);
size_t qemu_ram_pagesize_largest(void);
=20
/**
diff --git a/system/physmem.c b/system/physmem.c
index dc1db3a384..2c90cc2d78 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -1665,6 +1665,19 @@ size_t qemu_ram_pagesize(RAMBlock *rb)
return rb->page_size;
}
=20
+/* Return backend real page size used for the given ram_addr */
+size_t qemu_ram_pagesize_from_addr(ram_addr_t addr)
+{
+ RAMBlock *rb;
+
+ RCU_READ_LOCK_GUARD();
+ rb =3D qemu_get_ram_block(addr);
+ if (!rb) {
+ return TARGET_PAGE_SIZE;
+ }
+ return qemu_ram_pagesize(rb);
+}
+
/* Returns the largest size of page in use */
size_t qemu_ram_pagesize_largest(void)
{
@@ -2167,17 +2180,22 @@ void qemu_ram_free(RAMBlock *block)
}
=20
#ifndef _WIN32
-void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
+void qemu_ram_remap(ram_addr_t addr)
{
RAMBlock *block;
ram_addr_t offset;
int flags;
void *area, *vaddr;
int prot;
+ size_t page_size;
=20
RAMBLOCK_FOREACH(block) {
offset =3D addr - block->offset;
if (offset < block->max_length) {
+ /* Respect the pagesize of our RAMBlock */
+ page_size =3D qemu_ram_pagesize(block);
+ offset =3D QEMU_ALIGN_DOWN(offset, page_size);
+
vaddr =3D ramblock_ptr(block, offset);
if (block->flags & RAM_PREALLOC) {
;
@@ -2191,21 +2209,23 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t len=
gth)
prot =3D PROT_READ;
prot |=3D block->flags & RAM_READONLY ? 0 : PROT_WRITE;
if (block->fd >=3D 0) {
- area =3D mmap(vaddr, length, prot, flags, block->fd,
+ area =3D mmap(vaddr, page_size, prot, flags, block->fd,
offset + block->fd_offset);
} else {
flags |=3D MAP_ANONYMOUS;
- area =3D mmap(vaddr, length, prot, flags, -1, 0);
+ area =3D mmap(vaddr, page_size, prot, flags, -1, 0);
}
if (area !=3D vaddr) {
error_report("Could not remap addr: "
RAM_ADDR_FMT "@" RAM_ADDR_FMT "",
- length, addr);
+ page_size, addr);
exit(1);
}
- memory_try_enable_merging(vaddr, length);
- qemu_ram_setup_dump(vaddr, length);
+ memory_try_enable_merging(vaddr, page_size);
+ qemu_ram_setup_dump(vaddr, page_size);
}
+
+ break;
}
}
}
--=20
2.43.5