[PATCH v3 04/19] vfio/iommufd: Introduce HostIOMMUDeviceIOMMUFDVFIO device

[Zhenzhong Duan]

HostIOMMUDeviceIOMMUFDVFIO 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 operations, i.e., [at/de]taching hwpt, etc.

Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
 include/hw/vfio/vfio-common.h | 13 +++++++++++++
 hw/vfio/iommufd.c             |  6 +++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index aa3abe0a18..0943add3bc 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: "
 
@@ -159,6 +160,18 @@ struct HostIOMMUDeviceLegacyVFIO {
     VFIODevice *vdev;
 };
 
+#define TYPE_HOST_IOMMU_DEVICE_IOMMUFD_VFIO \
+            TYPE_HOST_IOMMU_DEVICE_IOMMUFD "-vfio"
+OBJECT_DECLARE_SIMPLE_TYPE(HostIOMMUDeviceIOMMUFDVFIO,
+                           HOST_IOMMU_DEVICE_IOMMUFD_VFIO)
+
+/* Abstraction of host IOMMU device with VFIO IOMMUFD backend */
+struct HostIOMMUDeviceIOMMUFDVFIO {
+    HostIOMMUDeviceIOMMUFD 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..997f4ac43e 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -639,7 +639,11 @@ static const TypeInfo types[] = {
         .name = TYPE_VFIO_IOMMU_IOMMUFD,
         .parent = TYPE_VFIO_IOMMU,
         .class_init = vfio_iommu_iommufd_class_init,
-    },
+    }, {
+        .name = TYPE_HOST_IOMMU_DEVICE_IOMMUFD_VFIO,
+        .parent = TYPE_HOST_IOMMU_DEVICE_IOMMUFD,
+        .instance_size = sizeof(HostIOMMUDeviceIOMMUFDVFIO),
+    }
 };
 
 DEFINE_TYPES(types)
-- 
2.34.1