commit 8c07559fc7ee132e2145ad09299a08c10ebe7804
author Aaron Lindsay <aaron@os.amperecomputing.com> Mon Jan 21 10:23:13 2019 +0000
committer Peter Maydell <peter.maydell@linaro.org> Mon Jan 21 10:38:55 2019 +0000
tree 78da6eb7ab56ca982e0f95a5ed341c510f284b26
parent 8733d762d5e089a017ac7c5bc71077a8d75d1b46

migration: Add post_save function to VMStateDescription

In some cases it may be helpful to modify state before saving it for
migration, and then modify the state back after it has been saved. The
existing pre_save function provides half of this functionality. This
patch adds a post_save function to provide the second half.

Signed-off-by: Aaron Lindsay <aclindsa@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 20181211151945.29137-2-aaron@os.amperecomputing.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

migration/vmstate.c

diff --git a/migration/vmstate.c b/migration/vmstate.c
index 80b5900..e2bbb7b 100644
--- a/migration/vmstate.c
+++ b/migration/vmstate.c
@@ -390,6 +390,9 @@
                 if (ret) {
                     error_report("Save of field %s/%s failed",
                                  vmsd->name, field->name);
+                    if (vmsd->post_save) {
+                        vmsd->post_save(opaque);
+                    }
                     return ret;
                 }
 
@@ -415,7 +418,15 @@
         json_end_array(vmdesc);
     }
 
-    return vmstate_subsection_save(f, vmsd, opaque, vmdesc);
+    ret = vmstate_subsection_save(f, vmsd, opaque, vmdesc);
+
+    if (vmsd->post_save) {
+        int ps_ret = vmsd->post_save(opaque);
+        if (!ret) {
+            ret = ps_ret;
+        }
+    }
+    return ret;
 }
 
 static const VMStateDescription *