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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,
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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 v4 2/7] system/physmem: poisoned memory discard on reboot
Date: Sat, 14 Dec 2024 13:45:50 +0000
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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>
---
system/physmem.c | 63 ++++++++++++++++++++++++++++++++----------------
1 file changed, 42 insertions(+), 21 deletions(-)
diff --git a/system/physmem.c b/system/physmem.c
index 2c90cc2d78..b228a692f8 100644
--- a/system/physmem.c
+++ b/system/physmem.c
@@ -2180,13 +2180,37 @@ void qemu_ram_free(RAMBlock *block)
}
=20
#ifndef _WIN32
+/* Try to simply remap the given location */
+static void qemu_ram_remap_mmap(RAMBlock *block, void* vaddr, size_t size,
+ ram_addr_t offset)
+{
+ int flags, prot;
+ void *area;
+
+ 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, size, prot, flags, block->fd,
+ offset + block->fd_offset);
+ } else {
+ flags |=3D MAP_ANONYMOUS;
+ area =3D mmap(vaddr, size, prot, flags, -1, 0);
+ }
+ if (area !=3D vaddr) {
+ error_report("Could not remap addr: " RAM_ADDR_FMT "@" RAM_ADDR_FM=
T "",
+ size, block->offset + offset);
+ exit(1);
+ }
+}
+
void qemu_ram_remap(ram_addr_t addr)
{
RAMBlock *block;
ram_addr_t offset;
- int flags;
- void *area, *vaddr;
- int prot;
+ void *vaddr;
size_t page_size;
=20
RAMBLOCK_FOREACH(block) {
@@ -2202,24 +2226,21 @@ 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 addr: "
- RAM_ADDR_FMT "@" RAM_ADDR_FMT "",
- page_size, addr);
- exit(1);
+ if (ram_block_discard_range(block, offset + block->fd_offs=
et,
+ page_size) !=3D 0) {
+ /*
+ * Fold 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("Memory poison recovery failure addr:=
"
+ RAM_ADDR_FMT "@" RAM_ADDR_FMT "",
+ page_size, addr);
+ exit(1);
+ }
+ qemu_ram_remap_mmap(block, vaddr, page_size, offset);
}
memory_try_enable_merging(vaddr, page_size);
qemu_ram_setup_dump(vaddr, page_size);
--=20
2.43.5