KVM: x86: hyper-v: Honor HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE privilege bit

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@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-17-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 230f52606e396ea22efd0ab05b1a40aba377dcf5..7b7da057b54bece7e31ad86d16c53820ac08bcd6 100644 (file)
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1262,6 +1262,10 @@ 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;
        }