On Mon, Aug 10, 2026 at 04:29:53PM +0800, Tina Zhang wrote: > Date: Mon, 10 Aug 2026 16:29:53 +0800 > From: Tina Zhang <[email protected]> > Subject: [PATCH v2 6/9] target/i386: Do not broadcast injected MCEs for > Hygon > X-Mailer: git-send-email 2.43.7 > > cpu_x86_support_mca_broadcast() excludes AMD CPUs because QEMU handles > AMD injected MCEs as local machine checks, not as Intel-style broadcast > MCEs. Hygon Dhyana missed that exclusion: it is not an AMD vendor CPU > and its family is greater than 6, so QEMU reported MCA broadcast > support. > > This affects QEMU's synthetic MCE injection paths. KVM memory-failure > injection uses this helper to decide whether to set MCE_INJECT_BROADCAST. > HMP 'mce -b' uses it to decide whether a broadcast request is valid. > With a multi-vCPU Dhyana guest, QEMU could fan out an injected MCE to > secondary vCPUs and populate extra bank records. > > Linux routes Hygon through the AMD MCE feature initialization path and > does not use Intel/Zhaoxin LMCE broadcast handling for Hygon. Do not > advertise Intel-style MCA broadcast support for Hygon in QEMU's injected > MCE paths. > > This is limited to the MCE broadcast-support decision. It does not claim > that all Hygon MCE/MCA behavior is identical to AMD. > > Signed-off-by: Tina Zhang <[email protected]> > --- > target/i386/helper.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-)
Reviewed-by: Zhao Liu <[email protected]>
