[Qemu-devel] [PATCH 2/8] memory: Sanity check that no listeners remain on a destroyed AddressSpace

[Alexey Kardashevskiy <aik@ozlabs.ru>]

From: David Gibson <david@gibson.dropbear.id.au>

At the moment, most AddressSpace objects last as long as the guest system
in practice, but that could well change in future.  In addition, for VFIO
we will be introducing some private per-AdressSpace information, which must
be disposed of before the AddressSpace itself is destroyed.

To reduce the chances of subtle bugs in this area, this patch adds
asssertions to ensure that when an AddressSpace is destroyed, there are no
remaining MemoryListeners using that AS as a filter.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 memory.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/memory.c b/memory.c
index 886f838..ffedde7 100644
--- a/memory.c
+++ b/memory.c
@@ -1726,11 +1726,18 @@ void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
 
 void address_space_destroy(AddressSpace *as)
 {
+    MemoryListener *listener;
+
     /* Flush out anything from MemoryListeners listening in on this */
     memory_region_transaction_begin();
     as->root = NULL;
     memory_region_transaction_commit();
     QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
+
+    QTAILQ_FOREACH(listener, &memory_listeners, link) {
+        assert(listener->address_space_filter != as);
+    }
+
     address_space_destroy_dispatch(as);
     flatview_unref(as->current_map);
     g_free(as->name);
-- 
1.8.3.2