tests/qemu-iotests/280

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