[PATCH rfcv2 04/18] vfio: Add host iommu device instance into VFIODevice

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

Either IOMMULegacyDevice or IOMMUFDDevice into VFIODevice, neither
both.

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

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 8bfb9cbe94..1bbad003ee 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: "
 
@@ -132,8 +133,18 @@ typedef struct VFIODevice {
     bool dirty_tracking;
     int devid;
     IOMMUFDBackend *iommufd;
+    union {
+        HostIOMMUDevice base_hdev;
+        IOMMULegacyDevice legacy_dev;
+        IOMMUFDDevice iommufd_dev;
+    };
 } VFIODevice;
 
+QEMU_BUILD_BUG_ON(offsetof(VFIODevice, legacy_dev.base) !=
+                  offsetof(VFIODevice, base_hdev));
+QEMU_BUILD_BUG_ON(offsetof(VFIODevice, iommufd_dev.base) !=
+                  offsetof(VFIODevice, base_hdev));
+
 struct VFIODeviceOps {
     void (*vfio_compute_needs_reset)(VFIODevice *vdev);
     int (*vfio_hot_reset_multi)(VFIODevice *vdev);
-- 
2.34.1