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-rw-r--r--arch/x86/kvm/svm/svm.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c5e3f219803e..fc5222a0f506 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2705,8 +2705,23 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
u64 data = msr->data;
switch (ecx) {
case MSR_AMD64_TSC_RATIO:
- if (!msr->host_initiated && !svm->tsc_scaling_enabled)
- return 1;
+
+ if (!svm->tsc_scaling_enabled) {
+
+ if (!msr->host_initiated)
+ return 1;
+ /*
+ * In case TSC scaling is not enabled, always
+ * leave this MSR at the default value.
+ *
+ * Due to bug in qemu 6.2.0, it would try to set
+ * this msr to 0 if tsc scaling is not enabled.
+ * Ignore this value as well.
+ */
+ if (data != 0 && data != svm->tsc_ratio_msr)
+ return 1;
+ break;
+ }
if (data & TSC_RATIO_RSVD)
return 1;