8da7969bd7
The "migration completed" event may be sent (on the source, to be specific) before the migration is actually completed, so the VM runstate will still be "finish-migrate" instead of "postmigrate". So ask the users of VM.wait_migration() to specify the final runstate they desire and then poll the VM until it has reached that state. (This should be over very quickly, so busy polling is fine.) Without this patch, I see intermittent failures in the new iotest 280 under high system load. I have not yet seen such failures with other iotests that use VM.wait_migration() and query-status afterwards, but maybe they just occur even more rarely, or it is because they also wait on the destination VM to be running. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
84 lines
2.9 KiB
Python
Executable file
84 lines
2.9 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Copyright (C) 2019 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: Kevin Wolf <kwolf@redhat.com>
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#
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# Test migration to file for taking an external snapshot with VM state.
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import iotests
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import os
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iotests.verify_image_format(supported_fmts=['qcow2'])
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iotests.verify_protocol(supported=['file'])
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iotests.verify_platform(['linux'])
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with iotests.FilePath('base') as base_path , \
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iotests.FilePath('top') as top_path, \
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iotests.VM() as vm:
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iotests.qemu_img_log('create', '-f', iotests.imgfmt, base_path, '64M')
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iotests.log('=== Launch VM ===')
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vm.add_object('iothread,id=iothread0')
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vm.add_blockdev('file,filename=%s,node-name=base-file' % (base_path))
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vm.add_blockdev('%s,file=base-file,node-name=base-fmt' % (iotests.imgfmt))
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vm.add_device('virtio-blk,drive=base-fmt,iothread=iothread0,id=vda')
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vm.launch()
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vm.enable_migration_events('VM')
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iotests.log('\n=== Migrate to file ===')
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vm.qmp_log('migrate', uri='exec:cat > /dev/null')
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with iotests.Timeout(3, 'Migration does not complete'):
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vm.wait_migration('postmigrate')
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iotests.log('\nVM is now stopped:')
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iotests.log(vm.qmp('query-migrate')['return']['status'])
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vm.qmp_log('query-status')
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iotests.log('\n=== Create a snapshot of the disk image ===')
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vm.blockdev_create({
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'driver': 'file',
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'filename': top_path,
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'size': 0,
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})
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vm.qmp_log('blockdev-add', node_name='top-file',
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driver='file', filename=top_path,
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filters=[iotests.filter_qmp_testfiles])
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vm.blockdev_create({
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'driver': iotests.imgfmt,
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'file': 'top-file',
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'size': 1024 * 1024,
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})
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vm.qmp_log('blockdev-add', node_name='top-fmt',
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driver=iotests.imgfmt, file='top-file')
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vm.qmp_log('blockdev-snapshot', node='base-fmt', overlay='top-fmt')
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iotests.log('\n=== Resume the VM and simulate a write request ===')
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vm.qmp_log('cont')
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iotests.log(vm.hmp_qemu_io('-d vda/virtio-backend', 'write 4k 4k'))
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iotests.log('\n=== Commit it to the backing file ===')
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result = vm.qmp_log('block-commit', job_id='job0', auto_dismiss=False,
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device='top-fmt', top_node='top-fmt',
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filters=[iotests.filter_qmp_testfiles])
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if 'return' in result:
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vm.run_job('job0')
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