vfio: Introduce vfio_listener_un/register() routines

This hides the MemoryListener implementation and makes the code common
to both IOMMU backends, legacy and IOMMUFD.

Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Link: https://lore.kernel.org/qemu-devel/20250326075122.1299361-35-clg@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 3 insertions, 8 deletions

diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index ff540e1c59..e4fcb1ad8b 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -616,12 +616,7 @@ static bool vfio_connect_container(VFIOGroup *group, AddressSpace *as,
     group->container = container;
     QLIST_INSERT_HEAD(&container->group_list, group, container_next);
 
-    bcontainer->listener = vfio_memory_listener;
-    memory_listener_register(&bcontainer->listener, bcontainer->space->as);
-
-    if (bcontainer->error) {
-        error_propagate_prepend(errp, bcontainer->error,
-            "memory listener initialization failed: ");
+    if (!vfio_listener_register(bcontainer, errp)) {
         goto listener_release_exit;
     }
 
@@ -631,7 +626,7 @@ static bool vfio_connect_container(VFIOGroup *group, AddressSpace *as,
 listener_release_exit:
     QLIST_REMOVE(group, container_next);
     vfio_kvm_device_del_group(group);
-    memory_listener_unregister(&bcontainer->listener);
+    vfio_listener_unregister(bcontainer);
     if (vioc->release) {
         vioc->release(bcontainer);
     }
@@ -669,7 +664,7 @@ static void vfio_disconnect_container(VFIOGroup *group)
      * group.
      */
     if (QLIST_EMPTY(&container->group_list)) {
-        memory_listener_unregister(&bcontainer->listener);
+        vfio_listener_unregister(bcontainer);
         if (vioc->release) {
             vioc->release(bcontainer);
         }