Hi Jonathan,
On 10/31/25 8:08 PM, Jonathan Cameron wrote:
On Fri, 31 Oct 2025 09:58:50 +0000
Jonathan Cameron <[email protected]> wrote:
On Tue, 7 Oct 2025 16:08:08 +1000
Gavin Shan <[email protected]> wrote:
In the situation where host and guest has 64KB and 4KB page sizes, one
error on the host's page affects 16 guest's pages. we need to send 16
consective errors in this specific case.
Hi Gavin,
Sorry this one has been on my to review list far too long.
No worries. Thanks for your review and comments. Igor suggested to have
separate error source for each vCPU. In that way, there will have multiple
read_ack_reg and the specific issue addressed by this series can be resolved.
Answering your question below.
Extend acpi_ghes_memory_errors() to support multiple CPERs after the
hunk of code to generate the GHES error status is pulled out from
ghes_gen_err_data_uncorrectable_recoverable().
I think this description needs to be more detailed wrt to how those
multiple CPERs are handled. Specifically that they are in a single
error status block (so should only represent related errors.)
This is to make it clear this isn't queuing events, but instead just
presenting them as one block.
No functional changes intended.
Signed-off-by: Gavin Shan <[email protected]>
---
hw/acpi/ghes-stub.c | 2 +-
hw/acpi/ghes.c | 27 ++++++++++++++-------------
include/hw/acpi/ghes.h | 2 +-
target/arm/kvm.c | 7 ++++++-
4 files changed, 22 insertions(+), 16 deletions(-)
diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index 06555905ce..045b77715f 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -214,18 +214,13 @@ static void acpi_ghes_build_append_mem_cper(GArray *table,
static void
ghes_gen_err_data_uncorrectable_recoverable(GArray *block,
- const uint8_t *section_type,
- int data_length)
+ const uint8_t *section_type)
{
/* invalid fru id: ACPI 4.0: 17.3.2.6.1 Generic Error Data,
* Table 17-13 Generic Error Data Entry
*/
QemuUUID fru_id = {};
- /* Build the new generic error status block header */
- acpi_ghes_generic_error_status(block, ACPI_GEBS_UNCORRECTABLE,
- 0, 0, data_length, ACPI_CPER_SEV_RECOVERABLE);
-]
With this bit gone, is it worth having the helper? Perhaps just move
the remains to where it is called.
Ack.
/* Build this new generic error data entry header */
acpi_ghes_generic_error_data(block, section_type,
ACPI_CPER_SEV_RECOVERABLE, 0, 0,
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index 4f769d69b3..9a47ac9e3a 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -2434,6 +2434,7 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void
*addr)
ram_addr_t ram_addr;
hwaddr paddr;
AcpiGhesState *ags;
+ GArray *addresses;
assert(code == BUS_MCEERR_AR || code == BUS_MCEERR_AO);
@@ -2442,6 +2443,7 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
ram_addr = qemu_ram_addr_from_host(addr);
if (ram_addr != RAM_ADDR_INVALID &&
kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
+ addresses = g_array_new(false, false, sizeof(paddr));
Given you are going to free in all paths, maybe a g_autofree?
Oddly there is no use of g_auto() with g_array in qemu. Ah well, next
suggestion is
my preference anyway.
Something like below can be used, and GArray is interchangeable to a regular
array.
I guess GArray is preferred in QEMU.
g_autoptr(GArray) sources = g_array_new(false, true,
sizeof(AcpiNotificationSourceId));
Also, we know this only grows to a fixed max size (16 after patch 3), so maybe
just
provide a hwaddr paddrs[16]; and pass forwards the count?
kvm_hwpoison_page_add(ram_addr);
/*
* If this is a BUS_MCEERR_AR, we know we have been called
@@ -2454,16 +2456,19 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code,
void *addr)
* later from the main thread, so doing the injection of
* the error would be more complicated.
*/
+ g_array_append_vals(addresses, &paddr, 1);
if (code == BUS_MCEERR_AR) {
kvm_cpu_synchronize_state(c);
if (!acpi_ghes_memory_errors(ags, ACPI_HEST_SRC_ID_SYNC,
- paddr)) {
+ addresses)) {
kvm_inject_arm_sea(c);
} else {
error_report("failed to record the error");
abort();
}
}
+
+ g_array_free(addresses, true);
return;
}
if (code == BUS_MCEERR_AO) {
Thanks,
Gavin
