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#!/usr/bin/env python3
#
# Tests for dirty bitmaps postcopy migration.
#
# Copyright (c) 2016-2017 Virtuozzo International GmbH. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os
import iotests
from iotests import qemu_img
debug = False
disk_a = os.path.join(iotests.test_dir, 'disk_a')
disk_b = os.path.join(iotests.test_dir, 'disk_b')
size = '256G'
fifo = os.path.join(iotests.test_dir, 'mig_fifo')
granularity = 512
nb_bitmaps = 15
GiB = 1024 * 1024 * 1024
discards1 = (
(0, GiB),
(2 * GiB + 512 * 5, 512),
(3 * GiB + 512 * 5, 512),
(100 * GiB, GiB)
)
discards2 = (
(3 * GiB + 512 * 8, 512),
(4 * GiB + 512 * 8, 512),
(50 * GiB, GiB),
(100 * GiB + GiB // 2, GiB)
)
def apply_discards(vm, discards):
for d in discards:
vm.hmp_qemu_io('drive0', 'discard {} {}'.format(*d))
def event_seconds(event):
return event['timestamp']['seconds'] + \
event['timestamp']['microseconds'] / 1000000.0
def event_dist(e1, e2):
return event_seconds(e2) - event_seconds(e1)
def check_bitmaps(vm, count):
result = vm.qmp('query-block')
if count == 0:
assert 'dirty-bitmaps' not in result['return'][0]
else:
assert len(result['return'][0]['dirty-bitmaps']) == count
class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
def tearDown(self):
if debug:
self.vm_a_events += self.vm_a.get_qmp_events()
self.vm_b_events += self.vm_b.get_qmp_events()
for e in self.vm_a_events:
e['vm'] = 'SRC'
for e in self.vm_b_events:
e['vm'] = 'DST'
events = (self.vm_a_events + self.vm_b_events)
events = [(e['timestamp']['seconds'],
e['timestamp']['microseconds'],
e['vm'],
e['event'],
e.get('data', '')) for e in events]
for e in sorted(events):
print('{}.{:06} {} {} {}'.format(*e))
self.vm_a.shutdown()
self.vm_b.shutdown()
os.remove(disk_a)
os.remove(disk_b)
os.remove(fifo)
def setUp(self):
os.mkfifo(fifo)
qemu_img('create', '-f', iotests.imgfmt, disk_a, size)
qemu_img('create', '-f', iotests.imgfmt, disk_b, size)
self.vm_a = iotests.VM(path_suffix='a').add_drive(disk_a,
'discard=unmap')
self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b,
'discard=unmap')
self.vm_b.add_incoming("exec: cat '" + fifo + "'")
self.vm_a.launch()
self.vm_b.launch()
# collect received events for debug
self.vm_a_events = []
self.vm_b_events = []
def start_postcopy(self):
""" Run migration until RESUME event on target. Return this event. """
for i in range(nb_bitmaps):
result = self.vm_a.qmp('block-dirty-bitmap-add', node='drive0',
name='bitmap{}'.format(i),
granularity=granularity,
persistent=True)
self.assert_qmp(result, 'return', {})
result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
node='drive0', name='bitmap0')
empty_sha256 = result['return']['sha256']
apply_discards(self.vm_a, discards1)
result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
node='drive0', name='bitmap0')
self.discards1_sha256 = result['return']['sha256']
# Check, that updating the bitmap by discards works
assert self.discards1_sha256 != empty_sha256
# We want to calculate resulting sha256. Do it in bitmap0, so, disable
# other bitmaps
for i in range(1, nb_bitmaps):
result = self.vm_a.qmp('block-dirty-bitmap-disable', node='drive0',
name='bitmap{}'.format(i))
self.assert_qmp(result, 'return', {})
apply_discards(self.vm_a, discards2)
result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
node='drive0', name='bitmap0')
self.all_discards_sha256 = result['return']['sha256']
# Now, enable some bitmaps, to be updated during migration
for i in range(2, nb_bitmaps, 2):
result = self.vm_a.qmp('block-dirty-bitmap-enable', node='drive0',
name='bitmap{}'.format(i))
self.assert_qmp(result, 'return', {})
caps = [{'capability': 'dirty-bitmaps', 'state': True},
{'capability': 'events', 'state': True}]
result = self.vm_a.qmp('migrate-set-capabilities', capabilities=caps)
self.assert_qmp(result, 'return', {})
result = self.vm_b.qmp('migrate-set-capabilities', capabilities=caps)
self.assert_qmp(result, 'return', {})
result = self.vm_a.qmp('migrate', uri='exec:cat>' + fifo)
self.assert_qmp(result, 'return', {})
result = self.vm_a.qmp('migrate-start-postcopy')
self.assert_qmp(result, 'return', {})
event_resume = self.vm_b.event_wait('RESUME')
self.vm_b_events.append(event_resume)
return event_resume
def test_postcopy_success(self):
event_resume = self.start_postcopy()
# enabled bitmaps should be updated
apply_discards(self.vm_b, discards2)
match = {'data': {'status': 'completed'}}
event_complete = self.vm_b.event_wait('MIGRATION', match=match)
self.vm_b_events.append(event_complete)
# take queued event, should already been happened
event_stop = self.vm_a.event_wait('STOP')
self.vm_a_events.append(event_stop)
downtime = event_dist(event_stop, event_resume)
postcopy_time = event_dist(event_resume, event_complete)
assert downtime * 10 < postcopy_time
if debug:
print('downtime:', downtime)
print('postcopy_time:', postcopy_time)
# check that there are no bitmaps stored on source
self.vm_a_events += self.vm_a.get_qmp_events()
self.vm_a.shutdown()
self.vm_a.launch()
check_bitmaps(self.vm_a, 0)
# check that bitmaps are migrated and persistence works
check_bitmaps(self.vm_b, nb_bitmaps)
self.vm_b.shutdown()
# recreate vm_b, so there is no incoming option, which prevents
# loading bitmaps from disk
self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b)
self.vm_b.launch()
check_bitmaps(self.vm_b, nb_bitmaps)
# Check content of migrated bitmaps. Still, don't waste time checking
# every bitmap
for i in range(0, nb_bitmaps, 5):
result = self.vm_b.qmp('x-debug-block-dirty-bitmap-sha256',
node='drive0', name='bitmap{}'.format(i))
sha = self.discards1_sha256 if i % 2 else self.all_discards_sha256
self.assert_qmp(result, 'return/sha256', sha)
def test_early_shutdown_destination(self):
self.start_postcopy()
self.vm_b_events += self.vm_b.get_qmp_events()
self.vm_b.shutdown()
# recreate vm_b, so there is no incoming option, which prevents
# loading bitmaps from disk
self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b)
self.vm_b.launch()
check_bitmaps(self.vm_b, 0)
# Bitmaps will be lost if we just shutdown the vm, as they are marked
# to skip storing to disk when prepared for migration. And that's
# correct, as actual data may be modified in target vm, so we play
# safe.
# Still, this mark would be taken away if we do 'cont', and bitmaps
# become persistent again. (see iotest 169 for such behavior case)
result = self.vm_a.qmp('query-status')
assert not result['return']['running']
self.vm_a_events += self.vm_a.get_qmp_events()
self.vm_a.shutdown()
self.vm_a.launch()
check_bitmaps(self.vm_a, 0)
def test_early_kill_source(self):
self.start_postcopy()
self.vm_a_events = self.vm_a.get_qmp_events()
self.vm_a.kill()
self.vm_a.launch()
match = {'data': {'status': 'completed'}}
e_complete = self.vm_b.event_wait('MIGRATION', match=match)
self.vm_b_events.append(e_complete)
check_bitmaps(self.vm_a, 0)
check_bitmaps(self.vm_b, 0)
if __name__ == '__main__':
iotests.main(supported_fmts=['qcow2'])
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