contrib: add libvhost-user

Add a library to help implementing vhost-user backend (or slave).

Dealing with vhost-user as an application developer isn't so easy: you
have all the trouble with any protocol: validation, unix ancillary data,
shared memory, eventfd, logging, and on top of that you need to deal
with virtio queues, if possible efficiently.

qemu test has a nice vhost-user testing application vhost-user-bridge,
which implements most of vhost-user, and virtio.c which implements
virtqueues manipulation. Based on these two, I tried to make a simple
library, reusable for tests or development of new vhost-user scenarios.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
[Felipe: set used_idx copy on SET_VRING_ADDR and update shadow avail idx
 on SET_VRING_BASE]
Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 474cc5e..68accb9 100644
--- a/Makefile
+++ b/Makefile
@@ -149,6 +149,7 @@ dummy := $(call unnest-vars,, \
                 qga-obj-y \
                 ivshmem-client-obj-y \
                 ivshmem-server-obj-y \
+                libvhost-user-obj-y \
                 qga-vss-dll-obj-y \
                 block-obj-y \
                 block-obj-m \