vfio/container: Introduce vfio_iommu_legacy_instance_init()

Just as we did for the VFIOContainerBase object, introduce an
instance_init() handler for the legacy VFIOContainer object and do the
specific initialization there.

Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/vfio/container.c

@@ -639,7 +639,6 @@ static bool vfio_connect_container(VFIOGroup *group, AddressSpace *as,
 
     vfio_kvm_device_add_group(group);
 
-    QLIST_INIT(&container->group_list);
     vfio_address_space_insert(space, bcontainer);
 
     group->container = container;
@@ -1183,6 +1182,13 @@ hiod_legacy_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
     return l;
 }
 
+static void vfio_iommu_legacy_instance_init(Object *obj)
+{
+    VFIOContainer *container = VFIO_IOMMU_LEGACY(obj);
+
+    QLIST_INIT(&container->group_list);
+}
+
 static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
 {
     HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
@@ -1196,6 +1202,7 @@ static const TypeInfo types[] = {
     {
         .name = TYPE_VFIO_IOMMU_LEGACY,
         .parent = TYPE_VFIO_IOMMU,
+        .instance_init = vfio_iommu_legacy_instance_init,
         .instance_size = sizeof(VFIOContainer),
         .class_init = vfio_iommu_legacy_class_init,
     }, {