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 10:41:47 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>,
        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

On Sat, 28 Dec 2019 17:19:36 +0800
Zenghui Yu <yuzenghui@...wei.com> wrote:

> 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"?

yeah, a silly copy-paste mistake, thanks for spotting this!

> Otherwise looks good!

Thanks for taking the time to review this work!

	M.
-- 
Jazz is not dead. It just smells funny...