From: Eric Auger <eric.auger@redhat.com>

Let's instantiate a dummy VFIOContainerClass implementation whose
functions are not yet implemented.

No fucntional change intended.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/hw/vfio/vfio-container-base.h |  1 +
 hw/vfio/container-base.c              | 40 +++++++++++++++++++++++++++
 hw/vfio/container.c                   | 22 +++++++++++++++
 hw/vfio/meson.build                   |  1 +
 4 files changed, 64 insertions(+)
 create mode 100644 hw/vfio/container-base.c

diff --git a/include/hw/vfio/vfio-container-base.h b/include/hw/vfio/vfio-container-base.h
index afc8543d22..226e960fb5 100644
--- a/include/hw/vfio/vfio-container-base.h
+++ b/include/hw/vfio/vfio-container-base.h
@@ -46,6 +46,7 @@ struct VFIOContainer {
     VFIOIOMMUBackendOpsClass *ops;
 };
 
+#define TYPE_VFIO_IOMMU_BACKEND_LEGACY_OPS "vfio-iommu-backend-legacy-ops"
 #define TYPE_VFIO_IOMMU_BACKEND_OPS "vfio-iommu-backend-ops"
 
 DECLARE_CLASS_CHECKERS(VFIOIOMMUBackendOpsClass,
diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c
new file mode 100644
index 0000000000..0c21e77039
--- /dev/null
+++ b/hw/vfio/container-base.c
@@ -0,0 +1,40 @@
+/*
+ * VFIO BASE CONTAINER
+ *
+ * Copyright (C) 2023 Intel Corporation.
+ * Copyright Red Hat, Inc. 2023
+ *
+ * Authors: Yi Liu <yi.l.liu@intel.com>
+ *          Eric Auger <eric.auger@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "hw/vfio/vfio-container-base.h"
+
+static const TypeInfo vfio_iommu_backend_ops_type_info = {
+    .name = TYPE_VFIO_IOMMU_BACKEND_OPS,
+    .parent = TYPE_OBJECT,
+    .abstract = true,
+    .class_size = sizeof(VFIOIOMMUBackendOpsClass),
+};
+
+static void vfio_iommu_backend_ops_register_types(void)
+{
+    type_register_static(&vfio_iommu_backend_ops_type_info);
+}
+type_init(vfio_iommu_backend_ops_register_types);
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 8fde302ae9..acc4a6bf8a 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -539,6 +539,9 @@ static void vfio_get_iommu_info_migration(VFIOLegacyContainer *container,
 static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
                                   Error **errp)
 {
+    VFIOIOMMUBackendOpsClass *ops = VFIO_IOMMU_BACKEND_OPS_CLASS(
+        object_class_by_name(TYPE_VFIO_IOMMU_BACKEND_LEGACY_OPS));
+    VFIOContainer *bcontainer;
     VFIOLegacyContainer *container;
     int ret, fd;
     VFIOAddressSpace *space;
@@ -620,6 +623,8 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
     QLIST_INIT(&container->giommu_list);
     QLIST_INIT(&container->hostwin_list);
     QLIST_INIT(&container->vrdl_list);
+    bcontainer = &container->bcontainer;
+    bcontainer->ops = ops;
 
     ret = vfio_init_container(container, group->fd, errp);
     if (ret) {
@@ -1160,3 +1165,20 @@ void vfio_detach_device(VFIODevice *vbasedev)
     vfio_put_base_device(vbasedev);
     vfio_put_group(group);
 }
+
+static void vfio_iommu_backend_legacy_ops_class_init(ObjectClass *oc,
+                                                     void *data) {
+}
+
+static const TypeInfo vfio_iommu_backend_legacy_ops_type = {
+    .name = TYPE_VFIO_IOMMU_BACKEND_LEGACY_OPS,
+
+    .parent = TYPE_VFIO_IOMMU_BACKEND_OPS,
+    .class_init = vfio_iommu_backend_legacy_ops_class_init,
+    .abstract = true,
+};
+static void vfio_iommu_backend_legacy_ops_register_types(void)
+{
+    type_register_static(&vfio_iommu_backend_legacy_ops_type);
+}
+type_init(vfio_iommu_backend_legacy_ops_register_types);
diff --git a/hw/vfio/meson.build b/hw/vfio/meson.build
index 2a6912c940..eb6ce6229d 100644
--- a/hw/vfio/meson.build
+++ b/hw/vfio/meson.build
@@ -2,6 +2,7 @@ vfio_ss = ss.source_set()
 vfio_ss.add(files(
   'helpers.c',
   'common.c',
+  'container-base.c',
   'container.c',
   'spapr.c',
   'migration.c',
-- 
2.34.1