Merge remote-tracking branch 'amit/master' into staging

* amit/master:
  virtio-serial-bus: Unset guest_connected at reset and driver reset
  virtio-serial-bus: fix guest_connected init before driver init

hw/virtio-serial-bus.c

@@ -528,6 +528,53 @@ static void set_config(VirtIODevice *vdev, const uint8_t *config_data)
     memcpy(&config, config_data, sizeof(config));
 }
 
+static void guest_reset(VirtIOSerial *vser)
+{
+    VirtIOSerialPort *port;
+    VirtIOSerialPortClass *vsc;
+
+    QTAILQ_FOREACH(port, &vser->ports, next) {
+        vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port);
+        if (port->guest_connected) {
+            port->guest_connected = false;
+
+            if (vsc->guest_close)
+                vsc->guest_close(port);
+        }
+    }
+}
+
+static void set_status(VirtIODevice *vdev, uint8_t status)
+{
+    VirtIOSerial *vser;
+    VirtIOSerialPort *port;
+
+    vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
+    port = find_port_by_id(vser, 0);
+
+    if (port && !use_multiport(port->vser)
+        && (status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        /*
+         * Non-multiport guests won't be able to tell us guest
+         * open/close status.  Such guests can only have a port at id
+         * 0, so set guest_connected for such ports as soon as guest
+         * is up.
+         */
+        port->guest_connected = true;
+    }
+    if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        guest_reset(vser);
+    }
+}
+
+static void vser_reset(VirtIODevice *vdev)
+{
+    VirtIOSerial *vser;
+
+    vser = DO_UPCAST(VirtIOSerial, vdev, vdev);
+    guest_reset(vser);
+}
+
 static void virtio_serial_save(QEMUFile *f, void *opaque)
 {
     VirtIOSerial *s = opaque;
@@ -798,14 +845,6 @@ static int virtser_port_qdev_init(DeviceState *qdev)
         return ret;
     }
 
-    if (!use_multiport(port->vser)) {
-        /*
-         * Allow writes to guest in this case; we have no way of
-         * knowing if a guest port is connected.
-         */
-        port->guest_connected = true;
-    }
-
     port->elem.out_num = 0;
 
     QTAILQ_INSERT_TAIL(&port->vser->ports, port, next);
@@ -905,6 +944,8 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *conf)
     vser->vdev.get_features = get_features;
     vser->vdev.get_config = get_config;
     vser->vdev.set_config = set_config;
+    vser->vdev.set_status = set_status;
+    vser->vdev.reset = vser_reset;
 
     vser->qdev = dev;