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: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/s390x/virtio-ccw.c

diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index b7c07ef..e772265 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1382,12 +1382,9 @@
 {
     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

diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
index 1817a07..3008b65 100644
--- a/hw/virtio/virtio-mmio.c
+++ b/hw/virtio/virtio-mmio.c
@@ -336,15 +336,6 @@
 
 /* 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 @@
     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

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 8ea7231..8923ba8 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -953,7 +953,6 @@
         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

diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index f1f9ca5..5244a3e 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -194,10 +194,12 @@
 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);