[Qemu-devel] [PATCH 15/30] virtio-pci: replace BusState.allow_hotplug with hotplug_handler

[Igor Mammedov <imammedo@redhat.com>]

Although virtio-pci-bus is internal object of composite
virtio-pci device and it doesn't participate in
-device/device_add hotplug flow, it's required by
bus_add_child() that bus must be hotpluggable to
be able to add child at runtime.
Set parent of virtio-pci-bus as NOP hotplug controller,
so that bus_add_child() would allow to add child
device during hotplug time when BusState.allow_hotplug
is dropped.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/virtio/virtio-pci.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index f560814..0486b25 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1070,6 +1070,10 @@ static const TypeInfo virtio_pci_info = {
     .class_init    = virtio_pci_class_init,
     .class_size    = sizeof(VirtioPCIClass),
     .abstract      = true,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_HOTPLUG_HANDLER },
+        { }
+    }
 };
 
 /* virtio-blk-pci */
@@ -1543,13 +1547,11 @@ static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
                                VirtIOPCIProxy *dev)
 {
     DeviceState *qdev = DEVICE(dev);
-    BusState *qbus;
     char virtio_bus_name[] = "virtio-bus";
 
     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev,
                         virtio_bus_name);
-    qbus = BUS(bus);
-    qbus->allow_hotplug = 1;
+    qbus_set_hotplug_handler(BUS(bus), qdev, &error_abort);
 }
 
 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
-- 
1.8.3.1