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i386/cpu: Mark CPUID 0x80000007[EBX] as reserved for Intel

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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.liu@intel.com>
Reviewed-by: Tao Su <tao1.su@linux.intel.com>
Link: https://lore.kernel.org/r/20250627035129.2755537-3-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Zhao Liu
2025-07-14 10:27:07 +02:00
committed by Paolo Bonzini
parent a539cd2614
commit 1c52c470ba
1 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
target/i386/cpu.c
+5 -1
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@@ -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;