It is used to specify the number of queues virtio-net device has.
(Default: 1)
+#. ``iommu-support``:
+
+ It is used to enable iommu support in vhost library.
+ (Default: 0 (disabled))
+
+#. ``postcopy-support``:
+
+ It is used to enable postcopy live-migration support in vhost library.
+ (Default: 0 (disabled))
+
Vhost PMD event handling
------------------------