Reset the Queue on GET_VRING_BASE

According to the vhost-user specs, we should start the vring upon
receiving the first kick, and stop it when we receive GET_VRING_BASE.

Strictly speaking, we should reset the underlying Queue on the first
kick, but it's actually easier to simply do that in GET_VRING_BASE and
be ready in case the guest re-initializes the vring.

Signed-off-by: Sergio Lopez <[email protected]>

Author: slp

src/lib.rs

@@ -789,6 +789,11 @@ impl<S: VhostUserBackend> VhostUserSlaveReqHandlerMut for VhostUserHandler<S> {
 
         self.vrings[index as usize].write().unwrap().call = None;
 
+        // Strictly speaking, we should do this upon receiving the first kick,
+        // but it's actually easier to just do it here so we're ready in case
+        // the vring gets re-initialized by the guest.
+        self.vrings[index as usize].write().unwrap().queue.reset();
+
         let next_avail = self.vrings[index as usize]
             .read()
             .unwrap()