The ioports are mapped in memory when using Linux UIO.
+* **Virtio support for containers.**
+
+ Add a new virtual device, named virtio-user, to support virtio for containers.
+
+ Known limitations:
+
+ * Control queue and multi-queue are not supported yet.
+ * Cannot work with --huge-unlink.
+ * Cannot work with --no-huge.
+ * Cannot work when there are more than VHOST_MEMORY_MAX_NREGIONS(8) hugepages.
+ * Root privilege is a must for sorting hugepages by physical address.
+ * Can only be used with vhost user backend.
+
* **Added vhost-user client mode.**
DPDK vhost-user could be the server as well as the client. It supports