On Tue, May 03, 2011 at 05:31:02PM -0500, Anthony Liguori wrote:
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.
Having to add/remove all ports at once is still an undesirable restriction on mgmt applications, hence the desire for a proper virtio block controller which allows multiple drives in the same way as LSI SCSI does today. Once we have the latter I don't really see much point in using multifunction virtio block.
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 -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|