Hi!
Noticed a thing - when we do vfio-pci hotplug, we register a memory
listener on PCI address space:
memory_listener_register(&container->listener, container->space->as);
Then on the "pseries" machine, I add IOMMU subregions and this ends up in
vfio_listener_region_add() where I can create hardware window and hook it
to KVM, etc, some stuff. So far so good.
Now I am trying hot unplug. So vfio_instance_finalize() is called, and from
it - vfio_put_group -> vfio_disconnect_container -> vfio_listener_release
-> memory_listener_unregister(&container->listener), as expected.
Hoewever, unlike memory_listener_register() (which calls region_add()
callbacks), memory_listener_unregister() is as simple as this:
void memory_listener_unregister(MemoryListener *listener)
{
QTAILQ_REMOVE(&memory_listeners, listener, link);
}
No region_del() calls => no proper cleanup. Hm.
Is there any particular reason for it to be that simple and there is
another way to be notified about some memory listener being unregistered?
Thanks.