[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 <vkuzn...@redhat.com>
---
 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