linux-kernel - Re: [PATCH v9 1/2] kvm: Use a reserved IRQ source ID for irqfd

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Message-ID: <504765B9.7010406@redhat.com>
Date:	Wed, 05 Sep 2012 17:46:17 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	mst@...hat.com, gleb@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 1/2] kvm: Use a reserved IRQ source ID for irqfd

On 08/21/2012 10:29 PM, Alex Williamson wrote:
> KVM_IRQFD currently uses the reserved KVM_USERSPACE_IRQ_SOURCE_ID
> which is also shared with userspace injection methods like
> KVM_IRQ_LINE.  This can cause a conflict if an irqfd triggers on
> a GSI asserted through KVM_IRQ_LINE.  Move irqfd to it's own
> reserved IRQ source ID.  Add a capability for userspace to test
> for this fix.

I don't think we need a cap, rather a backport if we identify real cases
where an edge gsi is shared among several devices.  Otherwise it is just
a theoretical bug before level irqfd is introduced.

-- 
error compiling committee.c: too many arguments to function
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