From: Zhao Liu <zhao1....@intel.com>
Per SDM,
80000007H EAX Reserved = 0.
EBX Reserved = 0.
ECX Reserved = 0.
EDX Bits 07-00: Reserved = 0.
Bit 08: Invariant TSC available if 1.
Bits 31-09: Reserved = 0.
EAX/EBX/ECX in CPUID 0x80000007 leaf are reserved for Intel.
At present, EAX is reserved for AMD, too. And AMD hasn't used ECX in
QEMU. So these 2 registers are both left as 0.
Therefore, only fix the EBX and excode it as 0 for Intel.
Signed-off-by: Zhao Liu <zhao1....@intel.com>
Reviewed-by: Tao Su <tao1...@linux.intel.com>
Link: https://lore.kernel.org/r/20250627035129.2755537-3-zhao1....@intel.com
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target/i386/cpu.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index ae508fa962d..533c9d9abc7 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -8376,7 +8376,11 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
}
case 0x80000007:
*eax = 0;
- *ebx = env->features[FEAT_8000_0007_EBX];
+ if (cpu->vendor_cpuid_only_v2 && IS_INTEL_CPU(env)) {
+ *ebx = 0;
+ } else {
+ *ebx = env->features[FEAT_8000_0007_EBX];
+ }
*ecx = 0;
*edx = env->features[FEAT_8000_0007_EDX];
break;
--
2.50.0
