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

Store the agent device (VFIO or VDPA) in the host IOMMU device.
This will allow easy access to some of its resources.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
---
 include/sysemu/host_iommu_device.h | 1 +
 hw/vfio/container.c                | 1 +
 hw/vfio/iommufd.c                  | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
index a57873958b03e1fcd6c0c8991a2010dde02c566c..3e5f058e7ba80491eae04dc73c6957f7269150cf 100644
--- a/include/sysemu/host_iommu_device.h
+++ b/include/sysemu/host_iommu_device.h
@@ -34,6 +34,7 @@ struct HostIOMMUDevice {
     Object parent_obj;
 
     char *name;
+    void *agent; /* pointer to agent device, ie. VFIO or VDPA device */
     HostIOMMUDeviceCaps caps;
 };
 
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index 26e6f7fb4f748162d881cb22c970428f319df3c3..b728b978a26d49b5a2895fd4d1add8f0a57787ad 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -1145,6 +1145,7 @@ static bool hiod_legacy_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
 
     hiod->name = g_strdup(vdev->name);
     hiod->caps.aw_bits = vfio_device_get_aw_bits(vdev);
+    hiod->agent = opaque;
 
     return true;
 }
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 409ed3dcc91cde508ac74fa693798b87e82eb9dd..dbdae1adbb66f9c8547659320ce4436825efe1a1 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -631,6 +631,8 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
         struct iommu_hw_info_vtd vtd;
     } data;
 
+    hiod->agent = opaque;
+
     if (!iommufd_backend_get_device_info(vdev->iommufd, vdev->devid,
                                          &type, &data, sizeof(data), errp)) {
         return false;
-- 
2.45.2