xref: /qemu/tests/qemu-iotests/280 (revision 727385c4) 
1#!/usr/bin/env python3
2# group: rw migration quick
3#
4# Copyright (C) 2019 Red Hat, Inc.
5#
6# This program is free software; you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation; either version 2 of the License, or
9# (at your option) any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <http://www.gnu.org/licenses/>.
18#
19# Creator/Owner: Kevin Wolf <kwolf@redhat.com>
20#
21# Test migration to file for taking an external snapshot with VM state.
22
23import iotests
24import os
25
26iotests.script_initialize(
27    supported_fmts=['qcow2'],
28    supported_protocols=['file'],
29    supported_platforms=['linux'],
30)
31
32with iotests.FilePath('base') as base_path , \
33     iotests.FilePath('top') as top_path, \
34     iotests.VM() as vm:
35
36    iotests.qemu_img_log('create', '-f', iotests.imgfmt, base_path, '64M')
37
38    iotests.log('=== Launch VM ===')
39    vm.add_object('iothread,id=iothread0')
40    vm.add_blockdev('file,filename=%s,node-name=base-file' % (base_path))
41    vm.add_blockdev('%s,file=base-file,node-name=base-fmt' % (iotests.imgfmt))
42    vm.add_device('virtio-blk,drive=base-fmt,iothread=iothread0,id=vda')
43    vm.launch()
44
45    vm.enable_migration_events('VM')
46
47    iotests.log('\n=== Migrate to file ===')
48    vm.qmp_log('migrate', uri='exec:cat > /dev/null')
49
50    with iotests.Timeout(3, 'Migration does not complete'):
51        vm.wait_migration('postmigrate')
52
53    iotests.log('\nVM is now stopped:')
54    iotests.log(vm.qmp('query-migrate')['return']['status'])
55    vm.qmp_log('query-status')
56
57    iotests.log('\n=== Create a snapshot of the disk image ===')
58    vm.blockdev_create({
59        'driver': 'file',
60        'filename': top_path,
61        'size': 0,
62    })
63    vm.qmp_log('blockdev-add', node_name='top-file',
64               driver='file', filename=top_path,
65               filters=[iotests.filter_qmp_testfiles])
66
67    vm.blockdev_create({
68        'driver': iotests.imgfmt,
69        'file': 'top-file',
70        'size': 1024 * 1024,
71    })
72    vm.qmp_log('blockdev-add', node_name='top-fmt',
73               driver=iotests.imgfmt, file='top-file')
74
75    vm.qmp_log('blockdev-snapshot', node='base-fmt', overlay='top-fmt')
76
77    iotests.log('\n=== Resume the VM and simulate a write request ===')
78    vm.qmp_log('cont')
79    iotests.log(vm.hmp_qemu_io('-d vda/virtio-backend', 'write 4k 4k'))
80
81    iotests.log('\n=== Commit it to the backing file ===')
82    result = vm.qmp_log('block-commit', job_id='job0', auto_dismiss=False,
83                        device='top-fmt', top_node='top-fmt',
84                        filters=[iotests.filter_qmp_testfiles])
85    if 'return' in result:
86        vm.run_job('job0')
87