Re: [PATCH v5 18/26] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint

Auger Eric
2017-11-07T21:38:03Z

Hi,

On 27/10/2017 16:28, 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.
This is actually done in the next patch.

Besides:
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric

>
> Let's update kvm_vgic_vcpu_pending_irq() to account for that
> flag as well, making a vcpu runnable when set.
>
> Acked-by: Christoffer Dall <cdall@linaro.org>
> 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 9d557efd1f7d..0691a2250949 100644
> --- a/virt/kvm/arm/vgic/vgic.c
> +++ b/virt/kvm/arm/vgic/vgic.c
> @@ -769,6 +769,9 @@ 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) {
>