linux-kernel - Re: [PATCH v5 23/23] KVM: arm64: GICv4.1: Expose HW-based SGIs in debugfs

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Date:   Thu, 19 Mar 2020 16:05:58 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Robert Richter <rrichter@...vell.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Zenghui Yu <yuzenghui@...wei.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v5 23/23] KVM: arm64: GICv4.1: Expose HW-based SGIs in
 debugfs

Hi Marc,

On 3/4/20 9:33 PM, Marc Zyngier wrote:
> The vgic-state debugfs file could do with showing the pending state
> of the HW-backed SGIs. Plug it into the low-level code.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  virt/kvm/arm/vgic/vgic-debug.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-debug.c b/virt/kvm/arm/vgic/vgic-debug.c
> index cc12fe9b2df3..b13a9e3f99dd 100644
> --- a/virt/kvm/arm/vgic/vgic-debug.c
> +++ b/virt/kvm/arm/vgic/vgic-debug.c
> @@ -178,6 +178,8 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
>  			    struct kvm_vcpu *vcpu)
>  {
>  	char *type;
> +	bool pending;
nit: can be directly initialized to irq->pending_latch
> +
>  	if (irq->intid < VGIC_NR_SGIS)
>  		type = "SGI";
>  	else if (irq->intid < VGIC_NR_PRIVATE_IRQS)
> @@ -190,6 +192,16 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
>  	if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS)
>  		print_header(s, irq, vcpu);
>  
> +	pending = irq->pending_latch;
> +	if (irq->hw && vgic_irq_is_sgi(irq->intid)) {
> +		int err;
> +
> +		err = irq_get_irqchip_state(irq->host_irq,
> +					    IRQCHIP_STATE_PENDING,
> +					    &pending);
> +		WARN_ON_ONCE(err);
> +	}
> +
>  	seq_printf(s, "       %s %4d "
>  		      "    %2d "
>  		      "%d%d%d%d%d%d%d "
> @@ -201,7 +213,7 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
>  		      "\n",
>  			type, irq->intid,
>  			(irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1,
> -			irq->pending_latch,
> +			pending,
>  			irq->line_level,
>  			irq->active,
>  			irq->enabled,
> 
The patch looks good to me but I am now lost about how we retrieve the
pending stat of other hw mapped interrupts. Looks we use
irq->pending_latch always. Is that correct?

For the patch:
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric