KVM does not let you read or write this MSR if the corresponding CPUID
bit is not set. This in turn causes MSRs that come after MSR_TSC_AUX
to be ignored by KVM_SET_MSRS.
One visible symptom is that s3.flat from kvm-unit-tests fails with
CPUs that do not have RDTSCP, because the SMBASE is not reset to
0x30000 after reset.
Fixes: c9b8f6b6210847b4381c5b2ee172b1c7eb9985d6
Cc: qemu-sta...@nongnu.org
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target-i386/kvm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 87ab969..19e2d94 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -917,6 +917,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
has_msr_mtrr = true;
}
+ if (!(env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_RDTSCP)) {
+ has_msr_tsc_aux = false;
+ }
return 0;
}
--
2.5.5
