for_each_padev
for_each_padev(print_one_device, NULL);
for_each_padev(qemu_print_iodc_data, NULL);
for_each_padev(match_and_count, &m);
ret = for_each_padev(find_device, &d);
ret = for_each_padev(is_IKE_device, NULL);
for_each_padev(qemu_print_hpa, NULL);