memory: switch memory listeners to a QTAILQ

This allows reverse iteration, which in turns allows consistent ordering
among multiple listeners:

  l1->add
  l2->add
  l2->del
  l1->del

Signed-off-by: Avi Kivity <avi@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/memory.h b/memory.h
index 4763286528..954dc86721 100644
--- a/memory.h
+++ b/memory.h
@@ -185,7 +185,9 @@ struct MemoryListener {
     void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
     void (*log_global_start)(MemoryListener *listener);
     void (*log_global_stop)(MemoryListener *listener);
-    QLIST_ENTRY(MemoryListener) link;
+    /* Lower = earlier (during add), later (during del) */
+    unsigned priority;
+    QTAILQ_ENTRY(MemoryListener) link;
 };
 
 /**