vhost-user: add VHOST_USER_SET_DEVICE_STATE_FD command

Set the file descriptor to use to transfer the
backend device state during migration.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fixed nits and coding style here and there]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/passt.c b/passt.c
index 1a0c404..b1c8ab6 100644
--- a/passt.c
+++ b/passt.c
@@ -75,6 +75,7 @@ char *epoll_type_str[] = {
 	[EPOLL_TYPE_TAP_LISTEN]		= "listening qemu socket",
 	[EPOLL_TYPE_VHOST_CMD]		= "vhost-user command socket",
 	[EPOLL_TYPE_VHOST_KICK]		= "vhost-user kick socket",
+	[EPOLL_TYPE_VHOST_MIGRATION]	= "vhost-user migration socket",
 };
 static_assert(ARRAY_SIZE(epoll_type_str) == EPOLL_NUM_TYPES,
 	      "epoll_type_str[] doesn't match enum epoll_type");
@@ -356,6 +357,9 @@ loop:
 		case EPOLL_TYPE_VHOST_KICK:
 			vu_kick_cb(c.vdev, ref, &now);
 			break;
+		case EPOLL_TYPE_VHOST_MIGRATION:
+			vu_migrate(c.vdev, eventmask);
+			break;
 		default:
 			/* Can't happen */
 			ASSERT(0);