linux-kernel - Re: [PATCH v3 43/59] KVM: arm/arm64: GICv4: Unmap VLPI when freeing an LPI

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Message-ID: <20170828181808.GC24649@cbox>
Date:   Mon, 28 Aug 2017 20:18:08 +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 43/59] KVM: arm/arm64: GICv4: Unmap VLPI when freeing
 an LPI

On Mon, Jul 31, 2017 at 06:26:21PM +0100, Marc Zyngier wrote:
> When freeing an LPI (on a DISCARD command, for example), we need
> to unmap the VLPI down to the physical ITS level.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  virt/kvm/arm/vgic/vgic-its.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
> index 40aeadef33fe..79bac93d3e7d 100644
> --- a/virt/kvm/arm/vgic/vgic-its.c
> +++ b/virt/kvm/arm/vgic/vgic-its.c
> @@ -623,8 +623,12 @@ static void its_free_ite(struct kvm *kvm, struct its_ite *ite)
>  	list_del(&ite->ite_list);
>  
>  	/* This put matches the get in vgic_add_lpi. */
> -	if (ite->irq)
> +	if (ite->irq) {
> +		if (ite->irq->hw)
> +			its_unmap_vlpi(ite->irq->host_irq);

nit: should we raise a warning on a bad return value?

Otherwise:

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

> +
>  		vgic_put_irq(kvm, ite->irq);
> +	}
>  
>  	kfree(ite);
>  }
> -- 
> 2.11.0
>