Commit 1561c2cb authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
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KVM: x86: hyper-v: Honor HV_MSR_HYPERCALL_AVAILABLE privilege bit 



HV_X64_MSR_GUEST_OS_ID/HV_X64_MSR_HYPERCALL are only available to guest
when HV_MSR_HYPERCALL_AVAILABLE bit is exposed.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-6-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent b4128000

arch/x86/kvm/hyperv.c

+12 −0
Original line number Diff line number Diff line
@@ -1205,6 +1205,18 @@ void kvm_hv_invalidate_tsc_page(struct kvm *kvm) 


static bool hv_check_msr_access(struct kvm_vcpu_hv *hv_vcpu, u32 msr)

{

	if (!hv_vcpu->enforce_cpuid)

		return true;



	switch (msr) {

	case HV_X64_MSR_GUEST_OS_ID:

	case HV_X64_MSR_HYPERCALL:

		return hv_vcpu->cpuid_cache.features_eax &

			HV_MSR_HYPERCALL_AVAILABLE;

	default:

		break;

	}



	return true;

}