From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> commit 033a3ea59a19df63edb4db6bfdbb357cd028258a upstream. kvm_cpuid_check_equal() checks for the (full) equality of the supplied CPUID data so .flags need to be checked too. Reported-by: Sean Christopherson <seanjc@xxxxxxxxxx> Fixes: c6617c61e8fe ("KVM: x86: Partially allow KVM_SET_CPUID{,2} after KVM_RUN") Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Message-Id: <20220126131804.2839410-1-vkuznets@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kvm/cpuid.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -113,6 +113,7 @@ static int kvm_cpuid_check_equal(struct orig = &vcpu->arch.cpuid_entries[i]; if (e2[i].function != orig->function || e2[i].index != orig->index || + e2[i].flags != orig->flags || e2[i].eax != orig->eax || e2[i].ebx != orig->ebx || e2[i].ecx != orig->ecx || e2[i].edx != orig->edx) return -EINVAL;