[PATCH v3 07/10] target/i386: Do not broadcast injected MCEs for Hygon

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]>
Reviewed-by: Zhao Liu <[email protected]>
---
 target/i386/helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/i386/helper.c b/target/i386/helper.c
index 6836214162..c5bbe9715b 100644
--- a/target/i386/helper.c
+++ b/target/i386/helper.c
@@ -95,7 +95,7 @@ int cpu_x86_support_mca_broadcast(CPUX86State *env)
     int family = 0;
     int model = 0;
 
-    if (IS_AMD_CPU(env)) {
+    if (IS_AMD_CPU(env) || IS_HYGON_CPU(env)) {
         return 0;
     }
 
-- 
2.43.7