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Test migrating from a VM with a persistent bitmap in the backing chain, and then continuing that VM after the migration Signed-off-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200730120234.49288-3-mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
302 lines
10 KiB
Python
Executable File
302 lines
10 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Tests for dirty bitmaps migration.
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#
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# Copyright (c) 2016-2017 Virtuozzo International GmbH. All rights reserved.
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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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import os
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import iotests
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import time
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import itertools
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import operator
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import re
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from iotests import qemu_img, qemu_img_create, Timeout
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disk_a = os.path.join(iotests.test_dir, 'disk_a')
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disk_b = os.path.join(iotests.test_dir, 'disk_b')
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base_a = os.path.join(iotests.test_dir, 'base_a')
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size = '1M'
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mig_file = os.path.join(iotests.test_dir, 'mig_file')
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mig_cmd = 'exec: cat > ' + mig_file
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incoming_cmd = 'exec: cat ' + mig_file
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class TestDirtyBitmapMigration(iotests.QMPTestCase):
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def tearDown(self):
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self.vm_a.shutdown()
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self.vm_b.shutdown()
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os.remove(disk_a)
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os.remove(disk_b)
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os.remove(mig_file)
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def setUp(self):
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qemu_img('create', '-f', iotests.imgfmt, disk_a, size)
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qemu_img('create', '-f', iotests.imgfmt, disk_b, size)
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self.vm_a = iotests.VM(path_suffix='a').add_drive(disk_a)
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self.vm_a.launch()
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self.vm_b = iotests.VM(path_suffix='b')
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def add_bitmap(self, vm, granularity, persistent):
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params = {'node': 'drive0',
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'name': 'bitmap0',
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'granularity': granularity}
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if persistent:
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params['persistent'] = True
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result = vm.qmp('block-dirty-bitmap-add', **params)
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self.assert_qmp(result, 'return', {});
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def get_bitmap_hash(self, vm):
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result = vm.qmp('x-debug-block-dirty-bitmap-sha256',
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node='drive0', name='bitmap0')
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return result['return']['sha256']
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def check_bitmap(self, vm, sha256):
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result = vm.qmp('x-debug-block-dirty-bitmap-sha256',
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node='drive0', name='bitmap0')
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if sha256:
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self.assert_qmp(result, 'return/sha256', sha256);
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else:
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self.assert_qmp(result, 'error/desc',
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"Dirty bitmap 'bitmap0' not found");
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def do_test_migration_resume_source(self, persistent, migrate_bitmaps):
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granularity = 512
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# regions = ((start, count), ...)
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regions = ((0, 0x10000),
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(0xf0000, 0x10000),
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(0xa0201, 0x1000))
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mig_caps = [{'capability': 'events', 'state': True}]
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if migrate_bitmaps:
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mig_caps.append({'capability': 'dirty-bitmaps', 'state': True})
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result = self.vm_a.qmp('migrate-set-capabilities',
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capabilities=mig_caps)
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self.assert_qmp(result, 'return', {})
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self.add_bitmap(self.vm_a, granularity, persistent)
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for r in regions:
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self.vm_a.hmp_qemu_io('drive0', 'write %d %d' % r)
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sha256 = self.get_bitmap_hash(self.vm_a)
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result = self.vm_a.qmp('migrate', uri=mig_cmd)
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while True:
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event = self.vm_a.event_wait('MIGRATION')
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if event['data']['status'] == 'completed':
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break
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while True:
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result = self.vm_a.qmp('query-status')
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if (result['return']['status'] == 'postmigrate'):
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break
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# test that bitmap is still here
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removed = (not migrate_bitmaps) and persistent
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self.check_bitmap(self.vm_a, False if removed else sha256)
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result = self.vm_a.qmp('cont')
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self.assert_qmp(result, 'return', {})
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# test that bitmap is still here after invalidation
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self.check_bitmap(self.vm_a, sha256)
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# shutdown and check that invalidation didn't fail
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self.vm_a.shutdown()
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# catch 'Could not reopen qcow2 layer: Bitmap already exists'
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# possible error
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log = self.vm_a.get_log()
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log = re.sub(r'^\[I \d+\.\d+\] OPENED\n', '', log)
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log = re.sub(r'^(wrote .* bytes at offset .*\n.*KiB.*ops.*sec.*\n){3}',
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'', log)
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log = re.sub(r'\[I \+\d+\.\d+\] CLOSED\n?$', '', log)
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self.assertEqual(log, '')
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# test that bitmap is still persistent
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self.vm_a.launch()
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self.check_bitmap(self.vm_a, sha256 if persistent else False)
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def do_test_migration(self, persistent, migrate_bitmaps, online,
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shared_storage, pre_shutdown):
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granularity = 512
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# regions = ((start, count), ...)
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regions = ((0, 0x10000),
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(0xf0000, 0x10000),
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(0xa0201, 0x1000))
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should_migrate = \
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(migrate_bitmaps and (persistent or not pre_shutdown)) or \
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(persistent and shared_storage)
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mig_caps = [{'capability': 'events', 'state': True}]
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if migrate_bitmaps:
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mig_caps.append({'capability': 'dirty-bitmaps', 'state': True})
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self.vm_b.add_incoming(incoming_cmd if online else "defer")
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self.vm_b.add_drive(disk_a if shared_storage else disk_b)
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if online:
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os.mkfifo(mig_file)
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self.vm_b.launch()
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result = self.vm_b.qmp('migrate-set-capabilities',
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capabilities=mig_caps)
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self.assert_qmp(result, 'return', {})
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self.add_bitmap(self.vm_a, granularity, persistent)
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for r in regions:
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self.vm_a.hmp_qemu_io('drive0', 'write %d %d' % r)
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sha256 = self.get_bitmap_hash(self.vm_a)
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if pre_shutdown:
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self.vm_a.shutdown()
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self.vm_a.launch()
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result = self.vm_a.qmp('migrate-set-capabilities',
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capabilities=mig_caps)
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self.assert_qmp(result, 'return', {})
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result = self.vm_a.qmp('migrate', uri=mig_cmd)
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while True:
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event = self.vm_a.event_wait('MIGRATION')
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if event['data']['status'] == 'completed':
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break
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if not online:
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self.vm_a.shutdown()
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self.vm_b.launch()
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result = self.vm_b.qmp('migrate-set-capabilities',
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capabilities=mig_caps)
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self.assert_qmp(result, 'return', {})
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result = self.vm_b.qmp('migrate-incoming', uri=incoming_cmd)
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self.assert_qmp(result, 'return', {})
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while True:
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event = self.vm_b.event_wait('MIGRATION')
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if event['data']['status'] == 'completed':
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break
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self.check_bitmap(self.vm_b, sha256 if should_migrate else False)
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if should_migrate:
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self.vm_b.shutdown()
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# catch 'Could not reopen qcow2 layer: Bitmap already exists'
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# possible error
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log = self.vm_b.get_log()
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log = re.sub(r'^\[I \d+\.\d+\] OPENED\n', '', log)
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log = re.sub(r'\[I \+\d+\.\d+\] CLOSED\n?$', '', log)
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self.assertEqual(log, '')
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# recreate vm_b, as we don't want -incoming option (this will lead
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# to "cat" process left alive after test finish)
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self.vm_b = iotests.VM(path_suffix='b')
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self.vm_b.add_drive(disk_a if shared_storage else disk_b)
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self.vm_b.launch()
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self.check_bitmap(self.vm_b, sha256 if persistent else False)
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def inject_test_case(klass, name, method, *args, **kwargs):
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mc = operator.methodcaller(method, *args, **kwargs)
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setattr(klass, 'test_' + method + name, lambda self: mc(self))
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for cmb in list(itertools.product((True, False), repeat=5)):
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name = ('_' if cmb[0] else '_not_') + 'persistent_'
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name += ('_' if cmb[1] else '_not_') + 'migbitmap_'
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name += '_online' if cmb[2] else '_offline'
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name += '_shared' if cmb[3] else '_nonshared'
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if (cmb[4]):
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name += '__pre_shutdown'
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inject_test_case(TestDirtyBitmapMigration, name, 'do_test_migration',
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*list(cmb))
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for cmb in list(itertools.product((True, False), repeat=2)):
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name = ('_' if cmb[0] else '_not_') + 'persistent_'
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name += ('_' if cmb[1] else '_not_') + 'migbitmap'
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inject_test_case(TestDirtyBitmapMigration, name,
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'do_test_migration_resume_source', *list(cmb))
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class TestDirtyBitmapBackingMigration(iotests.QMPTestCase):
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def setUp(self):
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qemu_img_create('-f', iotests.imgfmt, base_a, size)
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qemu_img_create('-f', iotests.imgfmt, '-F', iotests.imgfmt,
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'-b', base_a, disk_a, size)
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for f in (disk_a, base_a):
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qemu_img('bitmap', '--add', f, 'bmap0')
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blockdev = {
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'node-name': 'node0',
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'driver': iotests.imgfmt,
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'file': {
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'driver': 'file',
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'filename': disk_a
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},
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'backing': {
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'node-name': 'node0-base',
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'driver': iotests.imgfmt,
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'file': {
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'driver': 'file',
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'filename': base_a
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}
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}
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}
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self.vm = iotests.VM()
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self.vm.launch()
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result = self.vm.qmp('blockdev-add', **blockdev)
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self.assert_qmp(result, 'return', {})
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# Check that the bitmaps are there
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for node in self.vm.qmp('query-named-block-nodes', flat=True)['return']:
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if 'node0' in node['node-name']:
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self.assert_qmp(node, 'dirty-bitmaps[0]/name', 'bmap0')
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caps = [{'capability': 'events', 'state': True}]
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result = self.vm.qmp('migrate-set-capabilities', capabilities=caps)
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self.assert_qmp(result, 'return', {})
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def tearDown(self):
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self.vm.shutdown()
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for f in (disk_a, base_a):
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os.remove(f)
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def test_cont_on_source(self):
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"""
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Continue the source after migration.
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"""
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result = self.vm.qmp('migrate', uri=f'exec: cat > /dev/null')
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self.assert_qmp(result, 'return', {})
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with Timeout(10, 'Migration timeout'):
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self.vm.wait_migration('postmigrate')
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result = self.vm.qmp('cont')
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self.assert_qmp(result, 'return', {})
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if __name__ == '__main__':
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iotests.main(supported_fmts=['qcow2'],
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supported_protocols=['file'])
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