savevm: introduce is_active method

Enable the creation of a method to tell migration if that section is
active and should be migrate.  We use it for blk-migration, that is
normally not active.  We don't create the method for RAM, as setups
without RAM are very strange O:-)

Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/vmstate.h b/vmstate.h
index 1dd42f5..96651a5 100644
--- a/vmstate.h
+++ b/vmstate.h
@@ -35,6 +35,7 @@ typedef struct SaveVMHandlers {
     int (*save_live_state)(QEMUFile *f, int stage, void *opaque);
     void (*cancel)(void *opaque);
     LoadStateHandler *load_state;
+    bool (*is_active)(void *opaque);
 } SaveVMHandlers;
 
 int register_savevm(DeviceState *dev,