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Subject: [PATCH v4 3/7] accel/kvm: Report the loss of a large memory page
Date: Sat, 14 Dec 2024 13:45:51 +0000
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From: William Roche <william.roche@oracle.com>
In case of a large page impacted by a memory error, enhance
the existing Qemu error message which indicates that the error
is injected in the VM, adding "on lost large page SIZE@ADDR".
Include also a similar message to the ARM platform.
In the case of a large page impacted, we now report:
...Memory Error at QEMU addr X and GUEST addr Y on lost large page SIZE@ADD=
R of type...
Signed-off-by: William Roche <william.roche@oracle.com>
---
accel/kvm/kvm-all.c | 4 ----
target/arm/kvm.c | 13 +++++++++++++
target/i386/kvm/kvm.c | 18 ++++++++++++++----
3 files changed, 27 insertions(+), 8 deletions(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 24c0c4ce3f..8a47aa7258 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -1286,10 +1286,6 @@ 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/target/arm/kvm.c b/target/arm/kvm.c
index 7b6812c0de..db234f79cc 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -2366,6 +2366,8 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, v=
oid *addr)
{
ram_addr_t ram_addr;
hwaddr paddr;
+ size_t page_size;
+ char lp_msg[54];
=20
assert(code =3D=3D BUS_MCEERR_AR || code =3D=3D BUS_MCEERR_AO);
=20
@@ -2373,6 +2375,14 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, =
void *addr)
ram_addr =3D qemu_ram_addr_from_host(addr);
if (ram_addr !=3D RAM_ADDR_INVALID &&
kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)=
) {
+ page_size =3D qemu_ram_pagesize_from_addr(ram_addr);
+ if (page_size > TARGET_PAGE_SIZE) {
+ ram_addr =3D ROUND_DOWN(ram_addr, page_size);
+ snprintf(lp_msg, sizeof(lp_msg), " on lost large page "
+ RAM_ADDR_FMT "@" RAM_ADDR_FMT "", page_size, ram_addr);
+ } else {
+ lp_msg[0] =3D '\0';
+ }
kvm_hwpoison_page_add(ram_addr);
/*
* If this is a BUS_MCEERR_AR, we know we have been called
@@ -2389,6 +2399,9 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, v=
oid *addr)
kvm_cpu_synchronize_state(c);
if (!acpi_ghes_record_errors(ACPI_HEST_SRC_ID_SEA, paddr))=
{
kvm_inject_arm_sea(c);
+ error_report("Guest Memory Error at QEMU addr %p and "
+ "GUEST addr 0x%" HWADDR_PRIx "%s of type %s inject=
ed",
+ addr, paddr, lp_msg, "BUS_MCEERR_AR");
} else {
error_report("failed to record the error");
abort();
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 8e17942c3b..336646ed61 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -741,6 +741,8 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, voi=
d *addr)
CPUX86State *env =3D &cpu->env;
ram_addr_t ram_addr;
hwaddr paddr;
+ size_t page_size;
+ char lp_msg[54];
=20
/* If we get an action required MCE, it has been injected by KVM
* while the VM was running. An action optional MCE instead should
@@ -753,6 +755,14 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, vo=
id *addr)
ram_addr =3D qemu_ram_addr_from_host(addr);
if (ram_addr !=3D RAM_ADDR_INVALID &&
kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)=
) {
+ page_size =3D qemu_ram_pagesize_from_addr(ram_addr);
+ if (page_size > TARGET_PAGE_SIZE) {
+ ram_addr =3D ROUND_DOWN(ram_addr, page_size);
+ snprintf(lp_msg, sizeof(lp_msg), " on lost large page "
+ RAM_ADDR_FMT "@" RAM_ADDR_FMT "", page_size, ram_a=
ddr);
+ } else {
+ lp_msg[0] =3D '\0';
+ }
kvm_hwpoison_page_add(ram_addr);
kvm_mce_inject(cpu, paddr, code);
=20
@@ -763,12 +773,12 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, v=
oid *addr)
*/
if (code =3D=3D BUS_MCEERR_AR) {
error_report("Guest MCE Memory Error at QEMU addr %p and "
- "GUEST addr 0x%" HWADDR_PRIx " of type %s injected",
- addr, paddr, "BUS_MCEERR_AR");
+ "GUEST addr 0x%" HWADDR_PRIx "%s of type %s injected",
+ addr, paddr, lp_msg, "BUS_MCEERR_AR");
} else {
warn_report("Guest MCE Memory Error at QEMU addr %p and "
- "GUEST addr 0x%" HWADDR_PRIx " of type %s injected",
- addr, paddr, "BUS_MCEERR_AO");
+ "GUEST addr 0x%" HWADDR_PRIx "%s of type %s injected",
+ addr, paddr, lp_msg, "BUS_MCEERR_AO");
}
=20
return;
--=20
2.43.5