From da1bf3732d0f82581a0455475935d2bca7fdcd86 Mon Sep 17 00:00:00 2001 From: Jim Mattson Date: Thu, 29 Sep 2022 15:52:01 -0700 Subject: [PATCH] KVM: x86: Mask off reserved bits in CPUID.8000001AH 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 Message-Id: <20220929225203.2234702-4-jmattson@google.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/cpuid.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 62c7f771a7cf..b27167a3d7e3 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -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*/