func: void qmp_migrate_set_speed(int64_t value, Error **errp)
  
  {
  
      MigrationState *s;
  
  
  
      if (value < 0) {
  
          value = 0;
  
      }
  
  
  
      s = migrate_get_current();
  
      s->bandwidth_limit = value;
  
      qemu_file_set_rate_limit(s->file, s->bandwidth_limit);
  
  }
  