virtio: move VIRTIO_F_NOTIFY_ON_EMPTY into core

Nearly all transports have been offering VIRTIO_F_NOTIFY_ON_EMPTY,
s390-virtio being the exception. There's no reason why it shouldn't
offer it as well, though (handling is done in core anyway), so let's
move it to the common virtio features.

While we're changing it anyway, fix the indentation for the
DEFINE_VIRTIO_COMMON_FEATURES macro.
Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/s390x/virtio-ccw.c

@@ -1382,12 +1382,9 @@ static void virtio_ccw_device_plugged(DeviceState *d)
 {
     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
     SubchDev *sch = dev->sch;
-    VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
 
     sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
 
-    virtio_add_feature(&vdev->host_features, VIRTIO_F_NOTIFY_ON_EMPTY);
-
     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
                           d->hotplugged, 1);
 }

hw/virtio/virtio-mmio.c

@@ -336,15 +336,6 @@ static void virtio_mmio_reset(DeviceState *d)
 
 /* virtio-mmio device */
 
-/* This is called by virtio-bus just after the device is plugged. */
-static void virtio_mmio_device_plugged(DeviceState *opaque)
-{
-    VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque);
-    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
-
-    virtio_add_feature(&vdev->host_features, VIRTIO_F_NOTIFY_ON_EMPTY);
-}
-
 static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
 {
     VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
@@ -384,7 +375,6 @@ static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data)
     k->notify = virtio_mmio_update_irq;
     k->save_config = virtio_mmio_save_config;
     k->load_config = virtio_mmio_load_config;
-    k->device_plugged = virtio_mmio_device_plugged;
     k->has_variable_vring_alignment = true;
     bus_class->max_dev = 1;
 }

hw/virtio/virtio-pci.c

@@ -953,7 +953,6 @@ static void virtio_pci_device_plugged(DeviceState *d)
         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
     }
 
-    virtio_add_feature(&vdev->host_features, VIRTIO_F_NOTIFY_ON_EMPTY);
     virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);
 }
 

include/hw/virtio/virtio.h

@@ -194,10 +194,12 @@ typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 typedef struct VirtIORNGConf VirtIORNGConf;
 
 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
-	DEFINE_PROP_BIT("indirect_desc", _state, _field, \
-			VIRTIO_RING_F_INDIRECT_DESC, true), \
-	DEFINE_PROP_BIT("event_idx", _state, _field, \
-			VIRTIO_RING_F_EVENT_IDX, true)
+    DEFINE_PROP_BIT("indirect_desc", _state, _field,    \
+                    VIRTIO_RING_F_INDIRECT_DESC, true), \
+    DEFINE_PROP_BIT("event_idx", _state, _field,        \
+                    VIRTIO_RING_F_EVENT_IDX, true),     \
+    DEFINE_PROP_BIT("notify_on_empty", _state, _field,  \
+                    VIRTIO_F_NOTIFY_ON_EMPTY, true)
 
 hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);