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From: =?UTF-8?q?=E2=80=9CWilliam=20Roche?= <william.roche@oracle.com>
To: david@redhat.com, kvm@vger.kernel.org, qemu-devel@nongnu.org,
qemu-arm@nongnu.org
Cc: william.roche@oracle.com, peterx@redhat.com, pbonzini@redhat.com,
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eduardo@habkost.net, marcel.apfelbaum@gmail.com,
wangyanan55@huawei.com, zhao1.liu@intel.com, joao.m.martins@oracle.com
Subject: [PATCH v7 2/6] system/physmem: poisoned memory discard on reboot
Date: Sat, 1 Feb 2025 09:57:22 +0000
Message-ID: <20250201095726.3768796-3-william.roche@oracle.com>
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From: William Roche <william.roche@oracle.com>
Repair poisoned memory location(s), calling ram_block_discard_range():
punching a hole in the backend file when necessary and regenerating
a usable memory.
If the kernel doesn't support the madvise calls used by this function
and we are dealing with anonymous memory, fall back to remapping the
location(s).
Signed-off-by: William Roche <william.roche@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
---
system/physmem.c | 58 ++++++++++++++++++++++++++++++------------------
1 file changed, 36 insertions(+), 22 deletions(-)
diff --git a/system/physmem.c b/system/physmem.c
index 3dd2adde73..e8ff930bc9 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -2167,6 +2167,23 @@ void qemu_ram_free(RAMBlock *block)
}
=20
#ifndef _WIN32
+/* Simply remap the given VM memory location from start to start+length */
+static int qemu_ram_remap_mmap(RAMBlock *block, uint64_t start, size_t len=
gth)
+{
+ int flags, prot;
+ void *area;
+ void *host_startaddr =3D block->host + start;
+
+ assert(block->fd < 0);
+ flags =3D MAP_FIXED | MAP_ANONYMOUS;
+ flags |=3D block->flags & RAM_SHARED ? MAP_SHARED : MAP_PRIVATE;
+ flags |=3D block->flags & RAM_NORESERVE ? MAP_NORESERVE : 0;
+ prot =3D PROT_READ;
+ prot |=3D block->flags & RAM_READONLY ? 0 : PROT_WRITE;
+ area =3D mmap(host_startaddr, length, prot, flags, -1, 0);
+ return area !=3D host_startaddr ? -errno : 0;
+}
+
/*
* qemu_ram_remap - remap a single RAM page
*
@@ -2184,9 +2201,7 @@ void qemu_ram_remap(ram_addr_t addr)
{
RAMBlock *block;
uint64_t offset;
- int flags;
- void *area, *vaddr;
- int prot;
+ void *vaddr;
size_t page_size;
=20
RAMBLOCK_FOREACH(block) {
@@ -2201,25 +2216,24 @@ void qemu_ram_remap(ram_addr_t addr)
;
} else if (xen_enabled()) {
abort();
- } else {
- flags =3D MAP_FIXED;
- flags |=3D block->flags & RAM_SHARED ?
- MAP_SHARED : MAP_PRIVATE;
- flags |=3D block->flags & RAM_NORESERVE ? MAP_NORESERVE : =
0;
- prot =3D PROT_READ;
- prot |=3D block->flags & RAM_READONLY ? 0 : PROT_WRITE;
- if (block->fd >=3D 0) {
- area =3D mmap(vaddr, page_size, prot, flags, block->fd,
- offset + block->fd_offset);
- } else {
- flags |=3D MAP_ANONYMOUS;
- area =3D mmap(vaddr, page_size, prot, flags, -1, 0);
- }
- if (area !=3D vaddr) {
- error_report("Could not remap RAM %s:%" PRIx64 "+%" PR=
Ix64
- " +%zx", block->idstr, offset,
- block->fd_offset, page_size);
- exit(1);
+ if (ram_block_discard_range(block, offset, page_size) !=3D=
0) {
+ /*
+ * Fall back to using mmap() only for anonymous mappin=
g,
+ * as if a backing file is associated we may not be ab=
le
+ * to recover the memory in all cases.
+ * So don't take the risk of using only mmap and fail =
now.
+ */
+ if (block->fd >=3D 0) {
+ error_report("Could not remap RAM %s:%" PRIx64 "+%"
+ PRIx64 " +%zx", block->idstr, offset,
+ block->fd_offset, page_size);
+ exit(1);
+ }
+ if (qemu_ram_remap_mmap(block, offset, page_size) !=3D=
0) {
+ error_report("Could not remap RAM %s:%" PRIx64 " +=
%zx",
+ block->idstr, offset, page_size);
+ exit(1);
+ }
}
memory_try_enable_merging(vaddr, page_size);
qemu_ram_setup_dump(vaddr, page_size);
--=20
2.43.5