qemu-display: add missing Disable stubs

The display should learn to do something sensible, like write some text?

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

qemu-display/src/console_listener.rs

@@ -128,6 +128,8 @@ pub trait ConsoleListenerHandler: 'static + Send + Sync {
     #[cfg(unix)]
     async fn update_dmabuf(&mut self, update: UpdateDMABUF);
 
+    async fn disable(&mut self);
+
     async fn mouse_set(&mut self, set: MouseSet);
 
     async fn cursor_define(&mut self, cursor: Cursor);
@@ -296,6 +298,10 @@ impl<H: ConsoleListenerHandler> ConsoleListener<H> {
         Ok(())
     }
 
+    async fn disable(&mut self) {
+        self.handler.disable().await;
+    }
+
     async fn mouse_set(&mut self, x: i32, y: i32, on: i32) {
         self.handler.mouse_set(MouseSet { x, y, on }).await;
     }

qemu-rdw/src/display.rs

@@ -266,6 +266,9 @@ mod imp {
                                 this.obj().render();
                                 let _ = wait_tx.send(());
                             }
+                            Disable => {
+                                log::warn!("Display disabled");
+                            }
                             Disconnected => {
                                 log::warn!("Console disconnected");
                             }
@@ -340,6 +343,7 @@ enum ConsoleEvent {
         _update: qemu_display::UpdateDMABUF,
         wait_tx: futures::channel::oneshot::Sender<()>,
     },
+    Disable,
     MouseSet(qemu_display::MouseSet),
     CursorDefine(qemu_display::Cursor),
     Disconnected,
@@ -391,6 +395,10 @@ impl ConsoleListenerHandler for ConsoleHandler {
         }
     }
 
+    async fn disable(&mut self) {
+        self.send(ConsoleEvent::Disable);
+    }
+
     async fn mouse_set(&mut self, set: qemu_display::MouseSet) {
         self.send(ConsoleEvent::MouseSet(set));
     }