Commit 1aa8a418 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
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KVM: x86: hyper-v: Honor HV_STIMER_DIRECT_MODE_AVAILABLE privilege bit 



Synthetic timers can only be configured in 'direct' mode when
HV_STIMER_DIRECT_MODE_AVAILABLE bit was exposed.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-20-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent d66bfa36

arch/x86/kvm/hyperv.c

+6 −0
Original line number Diff line number Diff line
@@ -631,11 +631,17 @@ static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config, 
	union hv_stimer_config new_config = {.as_uint64 = config},

		old_config = {.as_uint64 = stimer->config.as_uint64};

	struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);

	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);

	struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);



	if (!synic->active && !host)

		return 1;



	if (unlikely(!host && hv_vcpu->enforce_cpuid && new_config.direct_mode &&

		     !(hv_vcpu->cpuid_cache.features_edx &

		       HV_STIMER_DIRECT_MODE_AVAILABLE)))

		return 1;



	trace_kvm_hv_stimer_set_config(hv_stimer_to_vcpu(stimer)->vcpu_id,

				       stimer->index, config, host);