[libvirt] Support for more than 32 virtio devices
Anthony Liguori
anthony at codemonkey.ws
Tue May 3 22:31:02 UTC 2011
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
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