linux-kernel - Re: [PATCH v5 4/5] KVM: irqfd: use kvm_arch_is_virtual_intc

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Message-ID: <20150111211713.GF3868@cbox>
Date:	Sun, 11 Jan 2015 22:17:13 +0100
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Eric Auger <eric.auger@...aro.org>
Cc:	eric.auger@...com, marc.zyngier@....com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, alex.williamson@...hat.com, agraf@...e.de,
	joel.schopp@....com, gleb@...nel.org, pbonzini@...hat.com,
	borntraeger@...ibm.com, cornelia.huck@...ibm.com,
	linux-kernel@...r.kernel.org, patches@...aro.org,
	a.motakis@...tualopensystems.com
Subject: Re: [PATCH v5 4/5] KVM: irqfd: use
 kvm_arch_is_virtual_intc_initialized

On Wed, Dec 03, 2014 at 05:07:11PM +0100, Eric Auger wrote:
> On arm/arm64, the interrupt controller is dynamically instantiated.
> There is a risk the user-space assigns an irqfd before this latter
> is initialized and ready to accept virtual irq injection. On such
> attempt, the IRQFD setup is rejected and -EAGAIN is returned.
> 
> Signed-off-by: Eric Auger <eric.auger@...aro.org>
> ---
>  virt/kvm/eventfd.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> index b0fb390..f837c83 100644
> --- a/virt/kvm/eventfd.c
> +++ b/virt/kvm/eventfd.c
> @@ -314,6 +314,9 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
>  	unsigned int events;
>  	int idx;
>  
> +	if (!kvm_arch_is_virtual_intc_initialized(kvm))
> +		return -EAGAIN;
> +

You can fold this into the patch that defines the static inline since
nothing defines the KVM_HAVE_ARCH_... yet.

>  	irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL);
>  	if (!irqfd)
>  		return -ENOMEM;
> -- 
> 1.9.1
> 
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