vmstate: Add pre_load() hook

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 (*pre_load)(void *opaque);
     int (*post_load)(void *opaque);
     VMStateField *fields;
 };

savevm.c

@@ -1028,6 +1028,11 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
     if  (version_id < vmsd->minimum_version_id) {
         return vmsd->load_state_old(f, opaque, version_id);
     }
+    if (vmsd->pre_load) {
+        int ret = vmsd->pre_load(opaque);
+        if (ret)
+            return ret;
+    }
     while(field->name) {
         if (field->version_id <= version_id) {
             void *base_addr = opaque + field->offset;