[Qemu-devel] [PATCH 1/3] virtio: add bus_plugged() callback to VirtioDeviceClass

[Jesse Larrew <jlarrew@linux.vnet.ibm.com>]

Virtio devices are initialized prior to plugging them into a bus. However,
other initializations (such as host_features) don't occur until after the
device is plugged into the bus. If a device needs to modify it's
configuration based on host_features, then it needs to be notified when the
bus is attached and host_features is available for use.

This patch extends struct VirtioDeviceClass to add a bus_plugged() method.
If implemented by a device, it will be called after the device is attached
to a bus.

Signed-off-by: Jesse Larrew <jlarrew@linux.vnet.ibm.com>
---
 hw/virtio/virtio.c         | 3 +++
 include/hw/virtio/virtio.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 8176c14..96735fa 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1114,6 +1114,9 @@ static int virtio_device_init(DeviceState *qdev)
         return -1;
     }
     virtio_bus_plug_device(vdev);
+    if (k->bus_plugged) {
+        k->bus_plugged(vdev);
+    }
     return 0;
 }
 
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 6afdfd8..31fad30 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -156,6 +156,7 @@ typedef struct VirtioDeviceClass {
      * must mask in frontend instead.
      */
     void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
+    void (*bus_plugged)(VirtIODevice *vdev);
 } VirtioDeviceClass;
 
 void virtio_init(VirtIODevice *vdev, const char *name,
-- 
1.7.11.7