Commit d2547cf5 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
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KVM: x86: hyper-v: Limit guest to writing zero to HV_X64_MSR_TSC_EMULATION_STATUS 



HV_X64_MSR_TSC_EMULATION_STATUS indicates whether TSC accesses are emulated
after migration (to accommodate for a different host TSC frequency when TSC
scaling is not supported; we don't implement this in KVM). Guest can use
the same MSR to stop TSC access emulation by writing zero. Writing anything
else is forbidden.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210316143736.964151-2-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 08889894

arch/x86/kvm/hyperv.c

+3 −0
Original line number Diff line number Diff line
@@ -1229,6 +1229,9 @@ static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data, 
		hv->hv_tsc_emulation_control = data;

		break;

	case HV_X64_MSR_TSC_EMULATION_STATUS:

		if (data && !host)

			return 1;



		hv->hv_tsc_emulation_status = data;

		break;

	case HV_X64_MSR_TIME_REF_COUNT: