docs/qmp-events.txt

   1                    QEMU Machine Protocol Events
   2                    ============================
   3
   4 MIGRATION_PASS
   5 --------------
   6
   7 Emitted from the source side of a migration at the start of each pass
   8 (when it syncs the dirty bitmap)
   9
  10 Data: None.
  11
  12   - "pass": An incrementing count (starting at 1 on the first pass)
  13
  14 Example:
  15 {"timestamp": {"seconds": 1449669631, "microseconds": 239225},
  16  "event": "MIGRATION_PASS", "data": {"pass": 2}}