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Re: [PATCH v3 50/59] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint

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  Re: [PATCH v3 50/59] KVM: arm/arm64: GICv4: Use pending_last as a  scheduling hint Christoffer Dall <cdall@linaro.org> - 2017-08-28 20:20 +0200

#1721868 — Re: [PATCH v3 50/59] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint

On Mon, Jul 31, 2017 at 06:26:28PM +0100, Marc Zyngier wrote:
> When a vPE exits, the pending_last flag is set when there are
> pending VLPIs stored in the pending table. Similarily, we set
> this flag when a doorbell interrupt fires, as it indicates the
> same condition.
> 
> Let's update kvm_vgic_vcpu_pending_irq() to account for that
> flag as well, making a vcpu runnable when set.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  virt/kvm/arm/vgic/vgic.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
> index a96e566905d2..dfac894f6f03 100644
> --- a/virt/kvm/arm/vgic/vgic.c
> +++ b/virt/kvm/arm/vgic/vgic.c
> @@ -781,6 +781,9 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
>  	if (!vcpu->kvm->arch.vgic.enabled)
>  		return false;
>  
> +	if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last)
> +		return true;
> +
>  	spin_lock(&vgic_cpu->ap_list_lock);
>  
>  	list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
> -- 
> 2.11.0
> 

Acked-by: Christoffer Dall <cdall@linaro.org>

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