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KVM: x86: Mask off reserved bits in CPUID.8000001AH

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commit 079f6889818dd07903fb36c252532ab47ebb6d48 upstream.

KVM_GET_SUPPORTED_CPUID should only enumerate features that KVM
actually supports. In the case of CPUID.8000001AH, only three bits are
currently defined. The 125 reserved bits should be masked off.

Fixes: 24c82e576b78 ("KVM: Sanitize cpuid")
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20220929225203.2234702-4-jmattson@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jim Mattson 2022-09-29 15:52:01 -07:00 committed by Greg Kroah-Hartman
parent 2fa24d0274
commit da1bf3732d
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/cpuid.c
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@ -791,6 +791,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
entry->ecx = entry->edx = 0;
break;
case 0x8000001a:
entry->eax &= GENMASK(2, 0);
entry->ebx = entry->ecx = entry->edx = 0;
break;
case 0x8000001e:
break;
/*Add support for Centaur's CPUID instruction*/