xref: /qemu/tests/qemu-iotests/280 (revision abff1abf) 
1#!/usr/bin/env python3
2#
3# Copyright (C) 2019 Red Hat, Inc.
4#
5# This program is free software; you can redistribute it and/or modify
6# it under the terms of the GNU General Public License as published by
7# the Free Software Foundation; either version 2 of the License, or
8# (at your option) any later version.
9#
10# This program is distributed in the hope that it will be useful,
11# but WITHOUT ANY WARRANTY; without even the implied warranty of
12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13# GNU General Public License for more details.
14#
15# You should have received a copy of the GNU General Public License
16# along with this program.  If not, see <http://www.gnu.org/licenses/>.
17#
18# Creator/Owner: Kevin Wolf <kwolf@redhat.com>
19#
20# Test migration to file for taking an external snapshot with VM state.
21
22import iotests
23import os
24
25iotests.script_initialize(
26    supported_fmts=['qcow2'],
27    supported_protocols=['file'],
28    supported_platforms=['linux'],
29)
30
31with iotests.FilePath('base') as base_path , \
32     iotests.FilePath('top') as top_path, \
33     iotests.VM() as vm:
34
35    iotests.qemu_img_log('create', '-f', iotests.imgfmt, base_path, '64M')
36
37    iotests.log('=== Launch VM ===')
38    vm.add_object('iothread,id=iothread0')
39    vm.add_blockdev('file,filename=%s,node-name=base-file' % (base_path))
40    vm.add_blockdev('%s,file=base-file,node-name=base-fmt' % (iotests.imgfmt))
41    vm.add_device('virtio-blk,drive=base-fmt,iothread=iothread0,id=vda')
42    vm.launch()
43
44    vm.enable_migration_events('VM')
45
46    iotests.log('\n=== Migrate to file ===')
47    vm.qmp_log('migrate', uri='exec:cat > /dev/null')
48
49    with iotests.Timeout(3, 'Migration does not complete'):
50        vm.wait_migration('postmigrate')
51
52    iotests.log('\nVM is now stopped:')
53    iotests.log(vm.qmp('query-migrate')['return']['status'])
54    vm.qmp_log('query-status')
55
56    iotests.log('\n=== Create a snapshot of the disk image ===')
57    vm.blockdev_create({
58        'driver': 'file',
59        'filename': top_path,
60        'size': 0,
61    })
62    vm.qmp_log('blockdev-add', node_name='top-file',
63               driver='file', filename=top_path,
64               filters=[iotests.filter_qmp_testfiles])
65
66    vm.blockdev_create({
67        'driver': iotests.imgfmt,
68        'file': 'top-file',
69        'size': 1024 * 1024,
70    })
71    vm.qmp_log('blockdev-add', node_name='top-fmt',
72               driver=iotests.imgfmt, file='top-file')
73
74    vm.qmp_log('blockdev-snapshot', node='base-fmt', overlay='top-fmt')
75
76    iotests.log('\n=== Resume the VM and simulate a write request ===')
77    vm.qmp_log('cont')
78    iotests.log(vm.hmp_qemu_io('-d vda/virtio-backend', 'write 4k 4k'))
79
80    iotests.log('\n=== Commit it to the backing file ===')
81    result = vm.qmp_log('block-commit', job_id='job0', auto_dismiss=False,
82                        device='top-fmt', top_node='top-fmt',
83                        filters=[iotests.filter_qmp_testfiles])
84    if 'return' in result:
85        vm.run_job('job0')
86