linux-kernel - Re: [PATCH v3 28/32] KVM: arm64: GICv4.1: Add direct injection capability to SGI registers

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Date:   Sat, 28 Dec 2019 17:19:36 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>, <kvmarm@...ts.cs.columbia.edu>,
        <linux-kernel@...r.kernel.org>
CC:     Eric Auger <eric.auger@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "Andrew Murray" <Andrew.Murray@....com>,
        Robert Richter <rrichter@...vell.com>
Subject: Re: [PATCH v3 28/32] KVM: arm64: GICv4.1: Add direct injection
 capability to SGI registers

Hi Marc,

On 2019/12/24 19:10, Marc Zyngier wrote:
> Most of the GICv3 emulation code that deals with SGIs now has to be
> aware of the v4.1 capabilities in order to benefit from it.
> 
> Add such support, keyed on the interrupt having the hw flag set and
> being a SGI.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---

> diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
> index 0d090482720d..6ebf747a7806 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio.c
> @@ -290,6 +345,20 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu,
>   
>   		raw_spin_lock_irqsave(&irq->irq_lock, flags);
>   
> +		if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
> +			/* HW SGI? Ask the GIC to inject it */

Shouldn't this be "Ask the GIC to clear its pending state"?

Otherwise looks good!


Thanks,
Zenghui

> +			int err;
> +			err = irq_set_irqchip_state(irq->host_irq,
> +						    IRQCHIP_STATE_PENDING,
> +						    false);
> +			WARN_RATELIMIT(err, "IRQ %d", irq->host_irq);
> +
> +			raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
> +			vgic_put_irq(vcpu->kvm, irq);
> +
> +			continue;
> +		}
> +
>   		if (irq->hw)
>   			vgic_hw_irq_cpending(vcpu, irq, is_uaccess);
>   		else