tests/qemu-iotests/280

   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
  22 import iotests
  23 import os
  24
  25 iotests.script_initialize(
  26     supported_fmts=['qcow2'],
  27     supported_protocols=['file'],
  28     supported_platforms=['linux'],
  29 )
  30
  31 with 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')