virtio-s390-device: create a virtio-s390-bus during init.

A virtio-s390-bus is created during the init. So one VirtIODevice can be
connected on the virtio-s390-device through this bus.
Signed-off-by: NKONRAD Frederic <fred.konrad@greensocs.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/s390-virtio-bus.c

@@ -503,6 +503,8 @@ static int s390_virtio_busdev_init(DeviceState *dev)
     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
     VirtIOS390DeviceClass *_info = VIRTIO_S390_DEVICE_GET_CLASS(dev);
 
+    virtio_s390_bus_new(&_dev->bus, _dev);
+
     return _info->init(_dev);
 }
 

hw/s390-virtio-bus.h

@@ -96,6 +96,7 @@ struct VirtIOS390Device {
     virtio_net_conf net;
     VirtIOSCSIConf scsi;
     VirtIORNGConf rng;
+    VirtioBusState bus;
 };
 
 typedef struct VirtIOS390Bus {