[libvirt] Support for more than 32 virtio devices

[Anthony Liguori]

On 05/03/2011 09:33 AM, Daniel P. Berrange wrote:
> On Mon, May 02, 2011 at 08:09:07AM -0700, Badari Pulavarty wrote:
>> Hi,
>>
>> How can I make use of "multifunction" functionality to support
>> more than 32 virtio devices in QEMU through libvirt ?
>
> It isn't supported because it doesn't work with hotplug.

And to be clear, on the QEMU side, we really need to have a high level 
modelling of a multifunction device.  So the following should be possible:

-device virtio-blk-pci,ports=4,drive0=hda,drive1=hdb,drive2=hdc,...

Then libvirt could add/remove all ports in a single operation.

Regards,

Anthony Liguori

>
>> Are there corresponding changes in libvirt ?
>
> To increase the number of devices in a usable manner, we we're waiting
> for QEMU to support either
>
>   - A virtio block controller with multiple disks
>   - A PCI bridge to allow>  28 PCI devices
>
> Daniel