savevm: Migrate RAM based on name/offset

Synchronize RAM blocks with the target and migrate using name/offset
pairs.  This ensures both source and target have the same view of
RAM and that we get the right bits into the right slot.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/vl.c b/vl.c
index 4a1c5f4..8a5de9f 100644
--- a/vl.c
+++ b/vl.c
@@ -2794,7 +2794,7 @@
     if (qemu_opts_foreach(&qemu_drive_opts, drive_init_func, &machine->use_scsi, 1) != 0)
         exit(1);
 
-    register_savevm_live(NULL, "ram", 0, 3, NULL, ram_save_live, NULL, 
+    register_savevm_live(NULL, "ram", 0, 4, NULL, ram_save_live, NULL,
                          ram_load, NULL);
 
     if (nb_numa_nodes > 0) {