[PATCH 16/30] KVM: x86: hyper-v: Honor HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE privilege bit

[Vitaly Kuznetsov]

HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL are only
available to guest when HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE bit is
exposed.

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 f416c9de73cb..43ebb53b6b38 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1253,6 +1253,10 @@ static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr)
 	case HV_X64_MSR_TSC_EMULATION_STATUS:
 		return hv_vcpu->cpuid_cache.features_eax &
 			HV_ACCESS_REENLIGHTENMENT;
+	case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
+	case HV_X64_MSR_CRASH_CTL:
+		return hv_vcpu->cpuid_cache.features_edx &
+			HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
 	default:
 		break;
 	}
-- 
2.30.2