Re: [Qemu-devel] [PATCH] qemu: msi irq allocation api

[Michael S. Tsirkin]

On Thu, May 21, 2009 at 11:34:11AM +0100, Paul Brook wrote:
> > The PCI bus doesn't need any special support (I think) but something on
> > the other end needs to interpret those writes.
> 
> Sure. But there's definitely nothing PCI specific about it. I assumed this 
> would all be contained within the APIC.

Exactly. APIC supplies callbacks to set up/free/mask/unmask MSI interrupts.
For kvm, we'll have another implementation that passes these requests
on to kernel.

> > In any case we need some internal API for this, and qemu_irq looks like
> > a good choice.
> 
> What do you expect to be using this API?
> 
> Paul

emulated PCI devices such as virtio.
Hope to send a patch shortly.

-- 
MST