memory: allow MemoryListeners to observe a specific address space

Ignore any regions not belonging to a specified address space.

Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/kvm-all.c b/kvm-all.c
index a05e591..15bc42f 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1049,7 +1049,7 @@
     }
 
     kvm_state = s;
-    memory_listener_register(&kvm_memory_listener);
+    memory_listener_register(&kvm_memory_listener, NULL);
 
     s->many_ioeventfds = kvm_check_many_ioeventfds();