Add VMState support to run a function after load

Signed-off-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/hw.h

@@ -306,6 +306,7 @@ struct VMStateDescription {
     int minimum_version_id;
     int minimum_version_id_old;
     LoadStateHandler *load_state_old;
+    int (*run_after_load)(void *opaque);
     VMStateField *fields;
 };
 

savevm.c

@@ -1060,6 +1060,8 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
         }
         field++;
     }
+    if (vmsd->run_after_load)
+        return vmsd->run_after_load(opaque);
     return 0;
 }