On Tue, Aug 31, 2021 at 09:59:18AM +0800, Tianqiang Xu wrote:
> @@ -4304,8 +4374,14 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
> idx = srcu_read_lock(&vcpu->kvm->srcu);
> if (kvm_xen_msr_enabled(vcpu->kvm))
> kvm_xen_runstate_set_preempted(vcpu);
> - else
> + else {
> kvm_steal_time_set_preempted(vcpu);
> +
> + if (get_cpu_nr_running(smp_processor_id()) <= 1)
> + kvm_steal_time_set_is_idle(vcpu);
> + else
> + kvm_steal_time_clear_is_idle(vcpu);
> + }
> srcu_read_unlock(&vcpu->kvm->srcu, idx);
This cannot be right. The CPU could long since be running tasks again,
but as long as this vCPU crud doesn't run, the guest keeps thinking it's
physically idle.
