tests/qemu-iotests/199

   1 #!/usr/bin/env python3
   2 # group: rw migration
   3 #
   4 # Tests for dirty bitmaps postcopy migration.
   5 #
   6 # Copyright (c) 2016-2017 Virtuozzo International GmbH. All rights reserved.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 import os
  23 import iotests
  24 from iotests import qemu_img
  25
  26 debug = False
  27
  28 disk_a = os.path.join(iotests.test_dir, 'disk_a')
  29 disk_b = os.path.join(iotests.test_dir, 'disk_b')
  30 size = '256G'
  31 fifo = os.path.join(iotests.test_dir, 'mig_fifo')
  32
  33 granularity = 512
  34 nb_bitmaps = 15
  35
  36 GiB = 1024 * 1024 * 1024
  37
  38 discards1 = (
  39     (0, GiB),
  40     (2 * GiB + 512 * 5, 512),
  41     (3 * GiB + 512 * 5, 512),
  42     (100 * GiB, GiB)
  43 )
  44
  45 discards2 = (
  46     (3 * GiB + 512 * 8, 512),
  47     (4 * GiB + 512 * 8, 512),
  48     (50 * GiB, GiB),
  49     (100 * GiB + GiB // 2, GiB)
  50 )
  51
  52
  53 def apply_discards(vm, discards):
  54     for d in discards:
  55         vm.hmp_qemu_io('drive0', 'discard {} {}'.format(*d))
  56
  57
  58 def event_seconds(event):
  59     return event['timestamp']['seconds'] + \
  60         event['timestamp']['microseconds'] / 1000000.0
  61
  62
  63 def event_dist(e1, e2):
  64     return event_seconds(e2) - event_seconds(e1)
  65
  66
  67 def check_bitmaps(vm, count):
  68     result = vm.qmp('query-block')
  69
  70     if count == 0:
  71         assert 'dirty-bitmaps' not in result['return'][0]
  72     else:
  73         assert len(result['return'][0]['dirty-bitmaps']) == count
  74
  75
  76 class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
  77     def tearDown(self):
  78         if debug:
  79             self.vm_a_events += self.vm_a.get_qmp_events()
  80             self.vm_b_events += self.vm_b.get_qmp_events()
  81             for e in self.vm_a_events:
  82                 e['vm'] = 'SRC'
  83             for e in self.vm_b_events:
  84                 e['vm'] = 'DST'
  85             events = (self.vm_a_events + self.vm_b_events)
  86             events = [(e['timestamp']['seconds'],
  87                        e['timestamp']['microseconds'],
  88                        e['vm'],
  89                        e['event'],
  90                        e.get('data', '')) for e in events]
  91             for e in sorted(events):
  92                 print('{}.{:06} {} {} {}'.format(*e))
  93
  94         self.vm_a.shutdown()
  95         self.vm_b.shutdown()
  96         os.remove(disk_a)
  97         os.remove(disk_b)
  98         os.remove(fifo)
  99
 100     def setUp(self):
 101         os.mkfifo(fifo)
 102         qemu_img('create', '-f', iotests.imgfmt, disk_a, size)
 103         qemu_img('create', '-f', iotests.imgfmt, disk_b, size)
 104         self.vm_a = iotests.VM(path_suffix='a').add_drive(disk_a,
 105                                                           'discard=unmap')
 106         self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b,
 107                                                           'discard=unmap')
 108         self.vm_b.add_incoming("exec: cat '" + fifo + "'")
 109         self.vm_a.launch()
 110         self.vm_b.launch()
 111
 112         # collect received events for debug
 113         self.vm_a_events = []
 114         self.vm_b_events = []
 115
 116     def start_postcopy(self):
 117         """ Run migration until RESUME event on target. Return this event. """
 118         for i in range(nb_bitmaps):
 119             result = self.vm_a.qmp('block-dirty-bitmap-add', node='drive0',
 120                                    name='bitmap{}'.format(i),
 121                                    granularity=granularity,
 122                                    persistent=True)
 123             self.assert_qmp(result, 'return', {})
 124
 125         result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
 126                                node='drive0', name='bitmap0')
 127         empty_sha256 = result['return']['sha256']
 128
 129         apply_discards(self.vm_a, discards1)
 130
 131         result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
 132                                node='drive0', name='bitmap0')
 133         self.discards1_sha256 = result['return']['sha256']
 134
 135         # Check, that updating the bitmap by discards works
 136         assert self.discards1_sha256 != empty_sha256
 137
 138         # We want to calculate resulting sha256. Do it in bitmap0, so, disable
 139         # other bitmaps
 140         for i in range(1, nb_bitmaps):
 141             result = self.vm_a.qmp('block-dirty-bitmap-disable', node='drive0',
 142                                    name='bitmap{}'.format(i))
 143             self.assert_qmp(result, 'return', {})
 144
 145         apply_discards(self.vm_a, discards2)
 146
 147         result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
 148                                node='drive0', name='bitmap0')
 149         self.all_discards_sha256 = result['return']['sha256']
 150
 151         # Now, enable some bitmaps, to be updated during migration
 152         for i in range(2, nb_bitmaps, 2):
 153             result = self.vm_a.qmp('block-dirty-bitmap-enable', node='drive0',
 154                                    name='bitmap{}'.format(i))
 155             self.assert_qmp(result, 'return', {})
 156
 157         caps = [{'capability': 'dirty-bitmaps', 'state': True},
 158                 {'capability': 'events', 'state': True}]
 159
 160         result = self.vm_a.qmp('migrate-set-capabilities', capabilities=caps)
 161         self.assert_qmp(result, 'return', {})
 162
 163         result = self.vm_b.qmp('migrate-set-capabilities', capabilities=caps)
 164         self.assert_qmp(result, 'return', {})
 165
 166         result = self.vm_a.qmp('migrate', uri='exec:cat>' + fifo)
 167         self.assert_qmp(result, 'return', {})
 168
 169         result = self.vm_a.qmp('migrate-start-postcopy')
 170         self.assert_qmp(result, 'return', {})
 171
 172         event_resume = self.vm_b.event_wait('RESUME')
 173         self.vm_b_events.append(event_resume)
 174         return event_resume
 175
 176     def test_postcopy_success(self):
 177         event_resume = self.start_postcopy()
 178
 179         # enabled bitmaps should be updated
 180         apply_discards(self.vm_b, discards2)
 181
 182         match = {'data': {'status': 'completed'}}
 183         event_complete = self.vm_b.event_wait('MIGRATION', match=match)
 184         self.vm_b_events.append(event_complete)
 185
 186         # take queued event, should already been happened
 187         event_stop = self.vm_a.event_wait('STOP')
 188         self.vm_a_events.append(event_stop)
 189
 190         downtime = event_dist(event_stop, event_resume)
 191         postcopy_time = event_dist(event_resume, event_complete)
 192
 193         assert downtime * 10 < postcopy_time
 194         if debug:
 195             print('downtime:', downtime)
 196             print('postcopy_time:', postcopy_time)
 197
 198         # check that there are no bitmaps stored on source
 199         self.vm_a_events += self.vm_a.get_qmp_events()
 200         self.vm_a.shutdown()
 201         self.vm_a.launch()
 202         check_bitmaps(self.vm_a, 0)
 203
 204         # check that bitmaps are migrated and persistence works
 205         check_bitmaps(self.vm_b, nb_bitmaps)
 206         self.vm_b.shutdown()
 207         # recreate vm_b, so there is no incoming option, which prevents
 208         # loading bitmaps from disk
 209         self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b)
 210         self.vm_b.launch()
 211         check_bitmaps(self.vm_b, nb_bitmaps)
 212
 213         # Check content of migrated bitmaps. Still, don't waste time checking
 214         # every bitmap
 215         for i in range(0, nb_bitmaps, 5):
 216             result = self.vm_b.qmp('x-debug-block-dirty-bitmap-sha256',
 217                                    node='drive0', name='bitmap{}'.format(i))
 218             sha = self.discards1_sha256 if i % 2 else self.all_discards_sha256
 219             self.assert_qmp(result, 'return/sha256', sha)
 220
 221     def test_early_shutdown_destination(self):
 222         self.start_postcopy()
 223
 224         self.vm_b_events += self.vm_b.get_qmp_events()
 225         self.vm_b.shutdown()
 226         # recreate vm_b, so there is no incoming option, which prevents
 227         # loading bitmaps from disk
 228         self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b)
 229         self.vm_b.launch()
 230         check_bitmaps(self.vm_b, 0)
 231
 232         # Bitmaps will be lost if we just shutdown the vm, as they are marked
 233         # to skip storing to disk when prepared for migration. And that's
 234         # correct, as actual data may be modified in target vm, so we play
 235         # safe.
 236         # Still, this mark would be taken away if we do 'cont', and bitmaps
 237         # become persistent again. (see iotest 169 for such behavior case)
 238         result = self.vm_a.qmp('query-status')
 239         assert not result['return']['running']
 240         self.vm_a_events += self.vm_a.get_qmp_events()
 241         self.vm_a.shutdown()
 242         self.vm_a.launch()
 243         check_bitmaps(self.vm_a, 0)
 244
 245     def test_early_kill_source(self):
 246         self.start_postcopy()
 247
 248         self.vm_a_events = self.vm_a.get_qmp_events()
 249         self.vm_a.kill()
 250
 251         self.vm_a.launch()
 252
 253         match = {'data': {'status': 'completed'}}
 254         e_complete = self.vm_b.event_wait('MIGRATION', match=match)
 255         self.vm_b_events.append(e_complete)
 256
 257         check_bitmaps(self.vm_a, 0)
 258         check_bitmaps(self.vm_b, 0)
 259
 260
 261 if __name__ == '__main__':
 262     iotests.main(supported_fmts=['qcow2'])