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i386/cpu: Mark EBX/ECX/EDX in CPUID 0x80000000 leaf as reserved for Intel

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Per SDM,

80000000H EAX Maximum Input Value for Extended Function CPUID Information.
          EBX Reserved.
          ECX Reserved.
          EDX Reserved.

EBX/ECX/EDX in CPUID 0x80000000 leaf are reserved. Intel is using 0x0
leaf to encode vendor.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Tao Su <tao1.su@linux.intel.com>
Link: https://lore.kernel.org/r/20250627035129.2755537-2-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Zhao Liu 2025-06-27 11:51:26 +08:00 • committed by Paolo Bonzini
parent 8113b7f0e6
commit a539cd2614
1 changed files with 9 additions and 3 deletions
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12
target/i386/cpu.c
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@ -8280,9 +8280,15 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
break;
case 0x80000000:
*eax = env->cpuid_xlevel;
*ebx = env->cpuid_vendor1;
*edx = env->cpuid_vendor2;
*ecx = env->cpuid_vendor3;
if (cpu->vendor_cpuid_only_v2 &&
(IS_INTEL_CPU(env) || IS_ZHAOXIN_CPU(env))) {
*ebx = *ecx = *edx = 0;
} else {
*ebx = env->cpuid_vendor1;
*edx = env->cpuid_vendor2;
*ecx = env->cpuid_vendor3;
}
break;
case 0x80000001:
*eax = env->cpuid_version;