diff options
| author | Jim Mattson <jmattson@google.com> | 2022-09-30 00:51:58 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-10-22 07:54:35 -0400 |
| commit | 0469e56a14bf8cfb80507e51b7aeec0332cdbc13 (patch) | |
| tree | 37320d4565fcb1a35b3633228359d21f6e8db97d /arch/x86/kvm/cpuid.c | |
| parent | 9aec606c1609a5da177b579475a73f6c948e034a (diff) | |
| download | linux-0469e56a14bf8cfb80507e51b7aeec0332cdbc13.tar.bz2 | |
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@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 7065462378e2..834feeb0a828 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -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; |