"virtio" ``bus`` and "pci" or "ccw" ``address`` types. :since:`Since 1.2.8
(QEMU 2.1)`
- The optional ``queues`` attribute specifies the number of virt queues for
- virtio-blk. ( :since:`Since 3.9.0` )
+ virtio-blk ( :since:`Since 3.9.0` ) or vhost-user-blk
+ ( :since `Since 7.1.0` )
- The optional ``queue_size`` attribute specifies the size of each virt
- queue for virtio-blk. ( :since:`Since 7.8.0` )
+ queue for virtio-blk or vhost-user-blk. ( :since:`Since 7.8.0` )
- For virtio disks, `Virtio-related options`_ can also
be set. ( :since:`Since 3.5.0` )
- The optional ``metadata_cache`` subelement controls aspects related to the