Re: [PATCH v2 19/43] KVM: Add helpers to wake/query blocking vCPU

[Paolo Bonzini]

On 09/10/21 04:12, Sean Christopherson wrote:
> diff --git a/arch/arm64/kvm/arch_timer.c b/arch/arm64/kvm/arch_timer.c
> index 7e8396f74010..addd53b6eba6 100644
> --- a/arch/arm64/kvm/arch_timer.c
> +++ b/arch/arm64/kvm/arch_timer.c
> @@ -649,7 +649,6 @@ void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
>   {
>   	struct arch_timer_cpu *timer = vcpu_timer(vcpu);
>   	struct timer_map map;
> -	struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
>   
>   	if (unlikely(!timer->enabled))
>   		return;
> @@ -672,7 +671,7 @@ void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
>   	if (map.emul_ptimer)
>   		soft_timer_cancel(&map.emul_ptimer->hrtimer);
>   
> -	if (rcuwait_active(wait))
> +	if (kvm_vcpu_is_blocking(vcpu))
>   		kvm_timer_blocking(vcpu);
>   
>   	/*

So this trick is what you're applying to x86 too instead of using 
vmx_pre_block, I see.

Paolo