HV_X64_MSR_VP_INDEX is only available to guest when
HV_MSR_VP_INDEX_AVAILABLE bit is exposed.
Note, writing to HV_X64_MSR_VP_INDEX is only available from the host so
kvm_hv_set_msr() doesn't need an additional check.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
arch/x86/kvm/hyperv.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 7fdd9b9c50d6..07f1fc8575e5 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1514,6 +1514,10 @@ static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
switch (msr) {
case HV_X64_MSR_VP_INDEX:
+ if (unlikely(!host && !(hv_vcpu->cpuid_cache.features_eax &
+ HV_MSR_VP_INDEX_AVAILABLE)))
+ return 1;
+
data = hv_vcpu->vp_index;
break;
case HV_X64_MSR_EOI:
--
2.30.2
