> -----Original Message-----
> From: Jim Mattson <jmattson@xxxxxxxxxx>
> Sent: Thursday, September 29, 2022 3:52 PM
> To: kvm@xxxxxxxxxxxxxxx; pbonzini@xxxxxxxxxx; Christopherson,, Sean
> <seanjc@xxxxxxxxxx>
> Cc: Jim Mattson <jmattson@xxxxxxxxxx>
> Subject: [PATCH 1/6] 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: 0771671749b5 ("KVM: Enhance guest cpuid management")
> Signed-off-by: Jim Mattson <jmattson@xxxxxxxxxx>
> ---
> arch/x86/kvm/cpuid.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index
> 4c1c2c06e96b..ea4e213bcbfb 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -1119,6 +1119,7 @@ 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);
ebx of leaf 0x80000001 is reserved, at least from SDM of Intel processor. Do I miss something?
> cpuid_entry_override(entry, CPUID_8000_0001_EDX);
> cpuid_entry_override(entry, CPUID_8000_0001_ECX);
> break;
> --
> 2.38.0.rc1.362.ged0d419d3c-goog
