Re: [PATCH v11 08/11] KVM: x86/pmu: Emulate LBR feature via guest LBR event

[Peter Zijlstra]

On Thu, May 14, 2020 at 04:30:51PM +0800, Like Xu wrote:
> @@ -6698,6 +6698,7 @@ static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu)
>  
>       if (vcpu_to_pmu(vcpu)->version)
>               atomic_switch_perf_msrs(vmx);
> +
>       atomic_switch_umwait_control_msr(vmx);
>  
>       if (enable_preemption_timer)

Is this where the test to see if any of the KVM events went into ERROR
state should go?

        if (event->state == PERF_EVENT_STATE_ERROR) {
                pr_warn("unhappy, someone stole our counter\n");
        }

like..