Commit 17b6d517 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
Browse files

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



Synthetic debugging MSRs (HV_X64_MSR_SYNDBG_CONTROL,
HV_X64_MSR_SYNDBG_STATUS, HV_X64_MSR_SYNDBG_SEND_BUFFER,
HV_X64_MSR_SYNDBG_RECV_BUFFER, HV_X64_MSR_SYNDBG_PENDING_BUFFER,
HV_X64_MSR_SYNDBG_OPTIONS) are only available to guest when
HV_FEATURE_DEBUG_MSRS_AVAILABLE bit is exposed.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-18-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0a19c899

arch/x86/kvm/hyperv.c

+4 −0
Original line number Diff line number Diff line
@@ -1266,6 +1266,10 @@ static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr) 
	case HV_X64_MSR_CRASH_CTL:

		return hv_vcpu->cpuid_cache.features_edx &

			HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;

	case HV_X64_MSR_SYNDBG_OPTIONS:

	case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:

		return hv_vcpu->cpuid_cache.features_edx &

			HV_FEATURE_DEBUG_MSRS_AVAILABLE;

	default:

		break;

	}