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KVM: x86: Mask off reserved bits in CPUID.80000001H 

KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM
actually supports. CPUID.80000001:EBX[27:16] are reserved bits and
should be masked off.

Fixes: 0771671749 ("KVM: Enhance guest cpuid management")
Signed-off-by: Jim Mattson <jmattson@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson 2022-09-30 00:51:58 +02:00 committed by Paolo Bonzini
parent 9aec606c16
commit 0469e56a14
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/cpuid.c
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@ -1133,6 +1133,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
entry->eax = max(entry->eax, 0x80000021);
break;
case 0x80000001:
entry->ebx &= ~GENMASK(27, 16);
cpuid_entry_override(entry, CPUID_8000_0001_EDX);
cpuid_entry_override(entry, CPUID_8000_0001_ECX);
break;