Re: [PATCH v2 4/9] target/i386/kvm: Use AMD MCE status encoding for Hygon

On Mon, Aug 10, 2026 at 04:29:51PM +0800, Tina Zhang wrote:
> Date: Mon, 10 Aug 2026 16:29:51 +0800
> From: Tina Zhang <[email protected]>
> Subject: [PATCH v2 4/9] target/i386/kvm: Use AMD MCE status encoding for
>  Hygon
> X-Mailer: git-send-email 2.43.7
> 
> QEMU's KVM memory-failure injection path builds synthetic MCI_STATUS
> records for the guest CPU.  The status encoding is vendor-specific:
> Intel-style records use bits such as MCI_STATUS_S and MCI_STATUS_AR for
> action-required events, while the AMD path uses the AMD memory-failure
> encoding.
> 
> Today QEMU selects the AMD status encoding only for AuthenticAMD guests.
> Hygon guests should use the AMD status encoding as well, but currently
> get Intel-style injected status bits, including MCI_STATUS_S and
> MCI_STATUS_AR for action-required events, and a non-deferred
> action-optional record.  That can prevent a guest OS running on the Hygon
> CPU model from handling the injected MCE correctly.
> 
> Use the AMD injected-memory-failure MCE status encoding for Hygon guests
> as well.  This does not depend on Hygon exposing CPUID 0x80000007.EBX
> recovery features such as SUCCOR, and it does not advertise any new
> recovery capability.  The change is limited to QEMU's synthetic KVM
> memory-failure MCE status; it does not change CPUID, MCE bank state, or
> migrated CPU state.
> 
> Signed-off-by: Tina Zhang <[email protected]>
> ---
>  target/i386/kvm/kvm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Zhao Liu <[email protected]>