mirror of
https://github.com/xemu-project/xemu.git
synced 2026-07-11 01:24:41 +02:00
Juraj Marcin
7b842fe354
Currently, when postcopy starts, the source VM starts switchover and sends a package containing the state of all non-postcopiable devices. When the destination loads this package, the switchover is complete and the destination VM starts. However, if the device state load fails or the destination side crashes, the source side is already in POSTCOPY_ACTIVE state and cannot be recovered, even when it has the most up-to-date machine state as the destination has not yet started. This patch introduces a new POSTCOPY_DEVICE state which is active while the destination machine is loading the device state, is not yet running, and the source side can be resumed in case of a migration failure. Return-path is required for this state to function, otherwise it will be skipped in favor of POSTCOPY_ACTIVE. To transition from POSTCOPY_DEVICE to POSTCOPY_ACTIVE, the source side uses a PONG message that is a response to a PING message processed just before the POSTCOPY_RUN command that starts the destination VM. Thus, this feature is effective even if the destination side does not yet support this new state. Signed-off-by: Juraj Marcin <jmarcin@redhat.com> Link: https://lore.kernel.org/r/20251103183301.3840862-9-jmarcin@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com>
110 lines
4.7 KiB
Python
Executable File
110 lines
4.7 KiB
Python
Executable File
#!/usr/bin/env python3
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# group: rw migration quick
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#
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# Copyright (C) 2017 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Creator/Owner: Stefan Hajnoczi <stefanha@redhat.com>
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#
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# Non-shared storage migration test using NBD server and drive-mirror
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import iotests
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iotests.script_initialize(supported_fmts=['qcow2', 'qed', 'raw'],
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supported_platforms=['linux'])
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with iotests.FilePath('source.img') as source_img_path, \
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iotests.FilePath('dest.img') as dest_img_path, \
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iotests.FilePath('migration.sock', 'nbd.sock', base_dir=iotests.sock_dir) \
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as (migration_sock_path, nbd_sock_path), \
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iotests.VM('source') as source_vm, \
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iotests.VM('dest') as dest_vm:
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img_size = '1G'
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iotests.qemu_img_create('-f', iotests.imgfmt, source_img_path, img_size)
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iotests.qemu_io('-f', iotests.imgfmt, '-c', 'write 512M 1M', source_img_path)
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iotests.qemu_img_create('-f', iotests.imgfmt, dest_img_path, img_size)
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iotests.log('Launching VMs...')
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(source_vm.add_drive(source_img_path)
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.launch())
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(dest_vm.add_drive(dest_img_path)
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.add_incoming('unix:{0}'.format(migration_sock_path))
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.launch())
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source_vm.qmp_log('block-dirty-bitmap-add', node='drive0', name='bitmap0')
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iotests.log('Launching NBD server on destination...')
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iotests.log(dest_vm.qmp('nbd-server-start', addr={'type': 'unix', 'data': {'path': nbd_sock_path}}))
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iotests.log(dest_vm.qmp('nbd-server-add', device='drive0', writable=True))
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iotests.log('Starting `drive-mirror` on source...')
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iotests.log(source_vm.qmp(
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'drive-mirror',
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device='drive0',
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target='nbd+unix:///drive0?socket={0}'.format(nbd_sock_path),
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sync='full',
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format='raw', # always raw, the server handles the format
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mode='existing',
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job_id='mirror-job0'))
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iotests.log('Waiting for `drive-mirror` to complete...')
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iotests.log(source_vm.event_wait('BLOCK_JOB_READY'),
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filters=[iotests.filter_qmp_event,
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iotests.filter_block_job])
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iotests.log('Starting migration...')
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capabilities = [{'capability': 'events', 'state': True},
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{'capability': 'dirty-bitmaps', 'state': True}]
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source_vm.qmp('migrate-set-capabilities', capabilities=capabilities)
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dest_vm.qmp('migrate-set-capabilities', capabilities=capabilities)
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iotests.log(source_vm.qmp('migrate', uri='unix:{0}'.format(migration_sock_path)))
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source_vm.qmp_log('migrate-start-postcopy')
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while True:
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event1 = source_vm.event_wait('MIGRATION')
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if event1['data']['status'] in ('postcopy-device', 'postcopy-active'):
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# This event is racy, it depends do we really do postcopy or bitmap
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# was migrated during downtime (and no data to migrate in postcopy
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# phase). So, don't log it.
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continue
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iotests.log(event1, filters=[iotests.filter_qmp_event])
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if event1['data']['status'] in ('completed', 'failed'):
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iotests.log('Gracefully ending the `drive-mirror` job on source...')
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iotests.log(source_vm.qmp('block-job-cancel', device='mirror-job0'))
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break
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while True:
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event2 = source_vm.event_wait('BLOCK_JOB_COMPLETED')
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iotests.log(event2, filters=[iotests.filter_qmp_event,
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iotests.filter_block_job])
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if event2['event'] == 'BLOCK_JOB_COMPLETED':
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iotests.log('Stopping the NBD server on destination...')
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iotests.log(dest_vm.qmp('nbd-server-stop'))
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break
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iotests.log('Wait for migration completion on target...')
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migr_events = (('MIGRATION', {'data': {'status': 'completed'}}),
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('MIGRATION', {'data': {'status': 'failed'}}))
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event = dest_vm.events_wait(migr_events)
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iotests.log(event, filters=[iotests.filter_qmp_event])
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iotests.log('Check bitmaps on source:')
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iotests.log(source_vm.qmp('query-block')['return'][0]['inserted']['dirty-bitmaps'])
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iotests.log('Check bitmaps on target:')
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iotests.log(dest_vm.qmp('query-block')['return'][0]['inserted']['dirty-bitmaps'])
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