linux-kernel - Re: [PATCH v3 42/59] KVM: arm/arm64: GICv4: Handle INT command applied to a VLPI

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Message-ID: <20170828181804.GB24649@cbox>
Date:   Mon, 28 Aug 2017 20:18:04 +0200
From:   Christoffer Dall <cdall@...aro.org>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>,
        Shanker Donthineni <shankerd@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>
Subject: Re: [PATCH v3 42/59] KVM: arm/arm64: GICv4: Handle INT command
 applied to a VLPI

On Mon, Jul 31, 2017 at 06:26:20PM +0100, Marc Zyngier wrote:
> If the guest issues an INT command targetting a VLPI, let's
> call into the irq_set_irqchip_state() helper to make it pending
> on the physical side.
> 
> This works just as well if userspace decides to inject an interrupt
> using the normal userspace API...
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

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

> ---
>  virt/kvm/arm/vgic/vgic-its.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
> index a2217f53bbe5..40aeadef33fe 100644
> --- a/virt/kvm/arm/vgic/vgic-its.c
> +++ b/virt/kvm/arm/vgic/vgic-its.c
> @@ -573,6 +573,10 @@ static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
>  	if (err)
>  		return err;
>  
> +	if (irq->hw)
> +		return irq_set_irqchip_state(irq->host_irq,
> +					     IRQCHIP_STATE_PENDING, true);
> +
>  	spin_lock(&irq->irq_lock);
>  	irq->pending_latch = true;
>  	vgic_queue_irq_unlock(kvm, irq);
> -- 
> 2.11.0
>