HIODIOMMUFDVFIO represents a host IOMMU device under VFIO iommufd
backend. It will be created during VFIO device attaching and passed
to vIOMMU.

It includes a link to VFIODevice so that we can do VFIO device
specific hwpt attaching/detaching.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/hw/vfio/vfio-common.h | 11 +++++++++++
 hw/vfio/iommufd.c             | 11 ++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index f30772f534..d382b12ec1 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -32,6 +32,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/vfio/vfio-container-base.h"
 #include "sysemu/host_iommu_device.h"
+#include "sysemu/iommufd.h"
 
 #define VFIO_MSG_PREFIX "vfio %s: "
 
@@ -158,6 +159,16 @@ struct HIODLegacyVFIO {
     VFIODevice *vdev;
 };
 
+#define TYPE_HIOD_IOMMUFD_VFIO TYPE_HIOD_IOMMUFD "-vfio"
+OBJECT_DECLARE_SIMPLE_TYPE(HIODIOMMUFDVFIO, HIOD_IOMMUFD_VFIO)
+
+/* Abstraction of VFIO IOMMUFD host IOMMU device */
+struct HIODIOMMUFDVFIO {
+    /*< private >*/
+    HIODIOMMUFD parent;
+    VFIODevice *vdev;
+};
+
 typedef struct VFIODMABuf {
     QemuDmaBuf buf;
     uint32_t pos_x, pos_y, pos_updates;
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 8827ffe636..115b9f8e7f 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -634,12 +634,21 @@ static void vfio_iommu_iommufd_class_init(ObjectClass *klass, void *data)
     vioc->pci_hot_reset = iommufd_cdev_pci_hot_reset;
 };
 
+static void hiod_iommufd_vfio_class_init(ObjectClass *oc, void *data)
+{
+};
+
 static const TypeInfo types[] = {
     {
         .name = TYPE_VFIO_IOMMU_IOMMUFD,
         .parent = TYPE_VFIO_IOMMU,
         .class_init = vfio_iommu_iommufd_class_init,
-    },
+    }, {
+        .name = TYPE_HIOD_IOMMUFD_VFIO,
+        .parent = TYPE_HIOD_IOMMUFD,
+        .instance_size = sizeof(HIODIOMMUFDVFIO),
+        .class_init = hiod_iommufd_vfio_class_init,
+    }
 };
 
 DEFINE_TYPES(types)
-- 
2.34.1