[Qemu-devel] Re: [PATCH 2/2] virtio: enable msi-x for console+balloon

[Gerd Hoffmann <kraxel@redhat.com>]

On 12/07/09 14:03, Michael S. Tsirkin wrote:
> Also - why not simply use virtio? I assume you are talking about
> guests with virtio support otherwise MSI support in virtio
> won't matter for them.

Point.  Guests with virtio-console+balloon most likely can use virtio 
for storage+net too, so nothing performance-critical is left in ioapic 
irq space and IRQ sharing for the leftovers (just usb I think) shouldn't 
be a big issue.

>> Yes.  Three for balloon, but that can easily changed to two.
>
> Yes, please, make this change for 0.12.

We can also simply drop this ...

> No, but changing this will need updating guests.

... or postphone until we have the "one MSI-X vector" support working.

cheers,
   Gerd