tests/qemu-iotests/tests/iothreads-nbd-export

#!/usr/bin/env python3
# group: rw quick
#
# Copyright (C) 2024 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Creator/Owner: Kevin Wolf <kwolf@redhat.com>

import time
import qemu
import iotests

iotests.script_initialize(supported_fmts=['qcow2'],
                          supported_platforms=['linux'])

with iotests.FilePath('disk1.img') as path, \
     iotests.FilePath('nbd.sock', base_dir=iotests.sock_dir) as nbd_sock, \
     qemu.machine.QEMUMachine(iotests.qemu_prog) as vm:

    img_size = '10M'

    iotests.log('Preparing disk...')
    iotests.qemu_img_create('-f', iotests.imgfmt, path, img_size)
    vm.add_args('-blockdev', f'file,node-name=disk-file,filename={path}')
    vm.add_args('-blockdev', 'qcow2,node-name=disk,file=disk-file')
    vm.add_args('-object', 'iothread,id=iothread0')
    vm.add_args('-device',
                'virtio-blk,drive=disk,iothread=iothread0,share-rw=on')

    iotests.log('Launching VM...')
    vm.add_args('-accel', 'kvm', '-accel', 'tcg')
    #vm.add_args('-accel', 'qtest')
    vm.launch()

    iotests.log('Exporting to NBD...')
    iotests.log(vm.qmp('nbd-server-start',
                       addr={'type': 'unix', 'data': {'path': nbd_sock}}))
    iotests.log(vm.qmp('block-export-add', type='nbd', id='exp0',
                       node_name='disk', writable=True))

    iotests.log('Connecting qemu-img...')
    qemu_io = iotests.QemuIoInteractive('-f', 'raw',
                                        f'nbd+unix:///disk?socket={nbd_sock}')

    iotests.log('Moving the NBD export to a different iothread...')
    for i in range(0, 10):
        iotests.log(vm.qmp('system_reset'))
        time.sleep(0.1)

    iotests.log('Checking that it is still alive...')
    iotests.log(vm.qmp('query-status'))

    qemu_io.close()
    vm.shutdown()