linux-kernel - Re: [PATCH v5 18/26] KVM: arm/arm64: GICv4: Use pending

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Date:   Tue, 7 Nov 2017 22:38:03 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <marc.zyngier@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Christoffer Dall <cdall@...aro.org>,
        Andre Przywara <Andre.Przywara@....com>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Shanker Donthineni <shankerd@...eaurora.org>
Subject: Re: [PATCH v5 18/26] KVM: arm/arm64: GICv4: Use pending_last as a
 scheduling hint

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@...hat.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@...aro.org>
> Signed-off-by: Marc Zyngier <marc.zyngier@....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) {
>