Re: [PATCH v2 08/17] kvm: x86: Use fast CR3 switch for nested VMX

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On 13/06/2018 00:52, Junaid Shahid wrote:
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index aa7da1d8ece2..e4ee76bee3dd 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2122,16 +2122,22 @@ static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
>  
>  static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
>  {
> +	int ret = -EINTR;
> +	int idx = srcu_read_lock(&vcpu->kvm->srcu);
> +
>  	if (kvm_arch_vcpu_runnable(vcpu)) {
>  		kvm_make_request(KVM_REQ_UNHALT, vcpu);
> -		return -EINTR;
> +		goto out;
>  	}
>  	if (kvm_cpu_has_pending_timer(vcpu))
> -		return -EINTR;
> +		goto out;
>  	if (signal_pending(current))
> -		return -EINTR;
> +		goto out;
>  
> -	return 0;
> +	ret = 0;
> +out:
> +	srcu_read_unlock(&vcpu->kvm->srcu, idx);
> +	return ret;
>  }

What needs kvm->srcu here?

Thanks,

Paolo



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