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

Avi Kivity
2012-09-05T14:46:24Z

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.

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