memory: add API for observing updates to the physical memory map

Add an API that allows a client to observe changes in the global
memory map:
 - region added (possibly with logging enabled)
 - region removed (possibly with logging enabled)
 - logging started on a region
 - logging stopped on a region
 - global logging started
 - global logging removed

This API will eventually replace cpu_register_physical_memory_client().

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/exec.c b/exec.c
index 32782b48c9..36b61c91ac 100644
--- a/exec.c
+++ b/exec.c
@@ -1762,6 +1762,11 @@ static int cpu_notify_sync_dirty_bitmap(target_phys_addr_t start,
 static int cpu_notify_migration_log(int enable)
 {
     CPUPhysMemoryClient *client;
+    if (enable) {
+        memory_global_dirty_log_start();
+    } else {
+        memory_global_dirty_log_stop();
+    }
     QLIST_FOREACH(client, &memory_client_list, list) {
         int r = client->migration_log(client, enable);
         if (r < 0)