vfio/container: Simplify vfio_container_init()

Assign the base container VFIOAddressSpace 'space' pointer in
vfio_address_space_insert(). The ultimate goal is to remove
vfio_container_init() and instead rely on an .instance_init() handler
to perfom the initialization of VFIOContainerBase.

To be noted that vfio_connect_container() will assign the 'space'
pointer later in the execution flow. This should not have any
consequence.

Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

hw/vfio/common.c

@@ -1512,6 +1512,7 @@ void vfio_address_space_insert(VFIOAddressSpace *space,
                                VFIOContainerBase *bcontainer)
 {
     QLIST_INSERT_HEAD(&space->containers, bcontainer, next);
+    bcontainer->space = space;
 }
 
 struct vfio_device_info *vfio_get_device_info(int fd)

hw/vfio/container-base.c

@@ -71,11 +71,10 @@ int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                                                errp);
 }
 
-void vfio_container_init(VFIOContainerBase *bcontainer, VFIOAddressSpace *space,
+void vfio_container_init(VFIOContainerBase *bcontainer,
                          const VFIOIOMMUClass *ops)
 {
     bcontainer->ops = ops;
-    bcontainer->space = space;
     bcontainer->error = NULL;
     bcontainer->dirty_pages_supported = false;
     bcontainer->dma_max_mappings = 0;

hw/vfio/container.c

@@ -394,7 +394,7 @@ static const VFIOIOMMUClass *vfio_get_iommu_class(int iommu_type, Error **errp)
 }
 
 static bool vfio_set_iommu(VFIOContainer *container, int group_fd,
-                           VFIOAddressSpace *space, Error **errp)
+                           Error **errp)
 {
     int iommu_type;
     const VFIOIOMMUClass *vioc;
@@ -432,7 +432,7 @@ static bool vfio_set_iommu(VFIOContainer *container, int group_fd,
         return false;
     }
 
-    vfio_container_init(&container->bcontainer, space, vioc);
+    vfio_container_init(&container->bcontainer, vioc);
     return true;
 }
 
@@ -614,7 +614,7 @@ static bool vfio_connect_container(VFIOGroup *group, AddressSpace *as,
     container->fd = fd;
     bcontainer = &container->bcontainer;
 
-    if (!vfio_set_iommu(container, group->fd, space, errp)) {
+    if (!vfio_set_iommu(container, group->fd, errp)) {
         goto free_container_exit;
     }
 

hw/vfio/iommufd.c

@@ -357,7 +357,7 @@ static bool iommufd_cdev_attach(const char *name, VFIODevice *vbasedev,
     container->ioas_id = ioas_id;
 
     bcontainer = &container->bcontainer;
-    vfio_container_init(bcontainer, space, iommufd_vioc);
+    vfio_container_init(bcontainer, iommufd_vioc);
     vfio_address_space_insert(space, bcontainer);
 
     if (!iommufd_cdev_attach_container(vbasedev, container, errp)) {

include/hw/vfio/vfio-container-base.h

@@ -87,7 +87,6 @@ int vfio_container_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
                    VFIOBitmap *vbmap, hwaddr iova, hwaddr size, Error **errp);
 
 void vfio_container_init(VFIOContainerBase *bcontainer,
-                         VFIOAddressSpace *space,
                          const VFIOIOMMUClass *ops);
 void vfio_container_destroy(VFIOContainerBase *bcontainer);