memory: add ref/unref calls
Add ref/unref calls at the following places:
- places where memory regions are stashed by a listener and
used outside the BQL (including in Xen or KVM).
- memory_region_find callsites
- creation of aliases and containers (only the aliased/contained
region gets a reference to avoid loops)
- around calls to del_subregion/add_subregion, where the region
could disappear after the first call
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/xen-all.c b/xen-all.c
index 1f040c0..21246e0 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -459,6 +459,7 @@
static void xen_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
+ memory_region_ref(section->mr);
xen_set_memory(listener, section, true);
}
@@ -466,6 +467,7 @@
MemoryRegionSection *section)
{
xen_set_memory(listener, section, false);
+ memory_region_unref(section->mr);
}
static void xen_sync_dirty_bitmap(XenIOState *state,
