[PATCH v2 02/10] vfio: Introduce HIODLegacyVFIO device

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

HIODLegacyVFIO represents a host IOMMU device under VFIO legacy
container backend.

It includes a link to VFIODevice.

Suggested-by: Eric Auger <eric.auger@redhat.com>
Suggested-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/hw/vfio/vfio-common.h | 11 +++++++++++
 hw/vfio/container.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 b9da6c08ef..f30772f534 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -31,6 +31,7 @@
 #endif
 #include "sysemu/sysemu.h"
 #include "hw/vfio/vfio-container-base.h"
+#include "sysemu/host_iommu_device.h"
 
 #define VFIO_MSG_PREFIX "vfio %s: "
 
@@ -147,6 +148,16 @@ typedef struct VFIOGroup {
     bool ram_block_discard_allowed;
 } VFIOGroup;
 
+#define TYPE_HIOD_LEGACY_VFIO TYPE_HOST_IOMMU_DEVICE "-legacy-vfio"
+OBJECT_DECLARE_SIMPLE_TYPE(HIODLegacyVFIO, HIOD_LEGACY_VFIO)
+
+/* Abstraction of VFIO legacy host IOMMU device */
+struct HIODLegacyVFIO {
+    /*< private >*/
+    HostIOMMUDevice parent;
+    VFIODevice *vdev;
+};
+
 typedef struct VFIODMABuf {
     QemuDmaBuf buf;
     uint32_t pos_x, pos_y, pos_updates;
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 77bdec276e..44018ef085 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -1143,12 +1143,21 @@ static void vfio_iommu_legacy_class_init(ObjectClass *klass, void *data)
     vioc->pci_hot_reset = vfio_legacy_pci_hot_reset;
 };
 
+static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
+{
+};
+
 static const TypeInfo types[] = {
     {
         .name = TYPE_VFIO_IOMMU_LEGACY,
         .parent = TYPE_VFIO_IOMMU,
         .class_init = vfio_iommu_legacy_class_init,
-    },
+    }, {
+        .name = TYPE_HIOD_LEGACY_VFIO,
+        .parent = TYPE_HOST_IOMMU_DEVICE,
+        .instance_size = sizeof(HIODLegacyVFIO),
+        .class_init = hiod_legacy_vfio_class_init,
+    }
 };
 
 DEFINE_TYPES(types)
-- 
2.34.1