From: Sean Christopherson seanjc@google.com
commit 6f2b296aa6432d8274e258cc3220047ca04f5de0 upstream.
Inject #GP on guest accesses to MSR_TSC_AUX if RDTSCP is unsupported in the guest's CPUID model.
Fixes: 46896c73c1a4 ("KVM: svm: add support for RDTSCP") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson seanjc@google.com Message-Id: 20210423223404.3860547-2-seanjc@google.com Reviewed-by: Vitaly Kuznetsov vkuznets@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/svm/svm.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2651,6 +2651,9 @@ static int svm_get_msr(struct kvm_vcpu * case MSR_TSC_AUX: if (!boot_cpu_has(X86_FEATURE_RDTSCP)) return 1; + if (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) + return 1; msr_info->data = svm->tsc_aux; break; /* @@ -2859,6 +2862,10 @@ static int svm_set_msr(struct kvm_vcpu * if (!boot_cpu_has(X86_FEATURE_RDTSCP)) return 1;
+ if (!msr->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP)) + return 1; + /* * This is rare, so we update the MSR here instead of using * direct_access_msrs. Doing that would require a rdmsr in