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

[Gerd Hoffmann]

On 12/07/09 15:13, Michael S. Tsirkin wrote:
> Gerd, any idea whether "one MSI-X vector" feature is worth pursuing?

I'd rate it low priority.  First because virtio-enabled guests can use 
virtio-net+blk.  Also because with the upcoming p35 support we'll get a 
more modern pc emulation including a ioapic with all 24 IRQ lines being 
wired up, which will help reducing IRQ sharing too.

MSI support (no -X) could be more intresting (for emulated devices) as 
it is older and thus support is more common.  My T60 for example has no 
device with MSI-X support but 9 with MSI support.  Linux turns on MSI 
for 7 of them (4 PCIe ports, e1000, ahci, iwl3945).

cheers,
  Gerd