memory: support stateless memory listeners
Current memory listeners are incremental; that is, they are expected to
maintain their own state, and receive callbacks for changes to that state.
This patch adds support for stateless listeners; these work by receiving
a ->begin() callback (which tells them that new state is coming), a
sequence of ->region_add() and ->region_nop() callbacks, and then a
->commit() callback which signifies the end of the new state. They should
ignore ->region_del() callbacks.
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/xen-all.c b/xen-all.c
index a58a397..6a11342 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -394,6 +394,14 @@
}
}
+static void xen_begin(MemoryListener *listener)
+{
+}
+
+static void xen_commit(MemoryListener *listener)
+{
+}
+
static void xen_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
@@ -406,6 +414,11 @@
xen_set_memory(listener, section, false);
}
+static void xen_region_nop(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+}
+
static void xen_sync_dirty_bitmap(XenIOState *state,
target_phys_addr_t start_addr,
ram_addr_t size)
@@ -500,8 +513,11 @@
}
static MemoryListener xen_memory_listener = {
+ .begin = xen_begin,
+ .commit = xen_commit,
.region_add = xen_region_add,
.region_del = xen_region_del,
+ .region_nop = xen_region_nop,
.log_start = xen_log_start,
.log_stop = xen_log_stop,
.log_sync = xen_log_sync,
