For a Secure TSC enabled SNP guest, writes to MSR_IA32_TSC is not expected.
Log the error and return #GP.
Signed-off-by: Nikunj A Dadhania <nikunj@xxxxxxx>
---
arch/x86/kvm/svm/svm.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index bf86410b2f43..f9b2c1956a60 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3151,6 +3151,17 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
svm->tsc_aux = data;
break;
+ case MSR_IA32_TSC:
+ /*
+ * If Secure TSC is enabled, KVM doesn't expect to receive
+ * a VMEXIT for a TSC write, record the error and return a
+ * #GP
+ */
+ if (vcpu->arch.guest_state_protected && snp_secure_tsc_enabled(vcpu->kvm)) {
+ vcpu_unimpl(vcpu, "unimplemented IA32_TSC for secure tsc\n");
+ return 1;
+ }
+ break;
case MSR_IA32_DEBUGCTLMSR:
if (!lbrv) {
kvm_pr_unimpl_wrmsr(vcpu, ecx, data);
--
2.34.1
