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xemu/tests/qemu-iotests/300
Max Reitz cb5c6cd2dc iotests: Test node/bitmap aliases during migration 
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200820150725.68687-4-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Eric Blake <eblake@redhat.com>
[eblake: fold in python cleanups recommended by Vladimir]
Signed-off-by: Eric Blake <eblake@redhat.com>
2020-08-21 08:56:09 -05:00

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#!/usr/bin/env python3
#
# Copyright (C) 2020 Red Hat, Inc.
#
# Tests for dirty bitmaps migration with node aliases
#
# 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 random
import re
from typing import Dict, List, Optional, Union
import iotests
import qemu
BlockBitmapMapping = List[Dict[str, Union[str, List[Dict[str, str]]]]]
assert iotests.sock_dir is not None
mig_sock = os.path.join(iotests.sock_dir, 'mig_sock')
class TestDirtyBitmapMigration(iotests.QMPTestCase):
src_node_name: str = ''
dst_node_name: str = ''
src_bmap_name: str = ''
dst_bmap_name: str = ''
def setUp(self) -> None:
self.vm_a = iotests.VM(path_suffix='-a')
self.vm_a.add_blockdev(f'node-name={self.src_node_name},'
'driver=null-co')
self.vm_a.launch()
self.vm_b = iotests.VM(path_suffix='-b')
self.vm_b.add_blockdev(f'node-name={self.dst_node_name},'
'driver=null-co')
self.vm_b.add_incoming(f'unix:{mig_sock}')
self.vm_b.launch()
result = self.vm_a.qmp('block-dirty-bitmap-add',
node=self.src_node_name,
name=self.src_bmap_name)
self.assert_qmp(result, 'return', {})
# Dirty some random megabytes
for _ in range(9):
mb_ofs = random.randrange(1024)
self.vm_a.hmp_qemu_io(self.src_node_name, f'discard {mb_ofs}M 1M')
result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256',
node=self.src_node_name,
name=self.src_bmap_name)
self.bitmap_hash_reference = result['return']['sha256']
caps = [{'capability': name, 'state': True}
for name in ('dirty-bitmaps', 'events')]
for vm in (self.vm_a, self.vm_b):
result = vm.qmp('migrate-set-capabilities', capabilities=caps)
self.assert_qmp(result, 'return', {})
def tearDown(self) -> None:
self.vm_a.shutdown()
self.vm_b.shutdown()
try:
os.remove(mig_sock)
except OSError:
pass
def check_bitmap(self, bitmap_name_valid: bool) -> None:
result = self.vm_b.qmp('x-debug-block-dirty-bitmap-sha256',
node=self.dst_node_name,
name=self.dst_bmap_name)
if bitmap_name_valid:
self.assert_qmp(result, 'return/sha256',
self.bitmap_hash_reference)
else:
self.assert_qmp(result, 'error/desc',
f"Dirty bitmap '{self.dst_bmap_name}' not found")
def migrate(self, bitmap_name_valid: bool = True,
migration_success: bool = True) -> None:
result = self.vm_a.qmp('migrate', uri=f'unix:{mig_sock}')
self.assert_qmp(result, 'return', {})
with iotests.Timeout(5, 'Timeout waiting for migration to complete'):
self.assertEqual(self.vm_a.wait_migration('postmigrate'),
migration_success)
self.assertEqual(self.vm_b.wait_migration('running'),
migration_success)
if migration_success:
self.check_bitmap(bitmap_name_valid)
def verify_dest_error(self, msg: Optional[str]) -> None:
"""
Check whether the given error message is present in vm_b's log.
(vm_b is shut down to do so.)
If @msg is None, check that there has not been any error.
"""
self.vm_b.shutdown()
if msg is None:
self.assertNotIn('qemu-system-', self.vm_b.get_log())
else:
self.assertIn(msg, self.vm_b.get_log())
@staticmethod
def mapping(node_name: str, node_alias: str,
bitmap_name: str, bitmap_alias: str) -> BlockBitmapMapping:
return [{
'node-name': node_name,
'alias': node_alias,
'bitmaps': [{
'name': bitmap_name,
'alias': bitmap_alias
}]
}]
def set_mapping(self, vm: iotests.VM, mapping: BlockBitmapMapping,
error: Optional[str] = None) -> None:
"""
Invoke migrate-set-parameters on @vm to set the given @mapping.
Check for success if @error is None, or verify the error message
if it is not.
On success, verify that "info migrate_parameters" on HMP returns
our mapping. (Just to check its formatting code.)
"""
result = vm.qmp('migrate-set-parameters',
block_bitmap_mapping=mapping)
if error is None:
self.assert_qmp(result, 'return', {})
result = vm.qmp('human-monitor-command',
command_line='info migrate_parameters')
m = re.search(r'^block-bitmap-mapping:\r?(\n .*)*\n',
result['return'], flags=re.MULTILINE)
hmp_mapping = m.group(0).replace('\r', '') if m else None
self.assertEqual(hmp_mapping, self.to_hmp_mapping(mapping))
else:
self.assert_qmp(result, 'error/desc', error)
@staticmethod
def to_hmp_mapping(mapping: BlockBitmapMapping) -> str:
result = 'block-bitmap-mapping:\n'
for node in mapping:
result += f" '{node['node-name']}' -> '{node['alias']}'\n"
assert isinstance(node['bitmaps'], list)
for bitmap in node['bitmaps']:
result += f" '{bitmap['name']}' -> '{bitmap['alias']}'\n"
return result
class TestAliasMigration(TestDirtyBitmapMigration):
src_node_name = 'node0'
dst_node_name = 'node0'
src_bmap_name = 'bmap0'
dst_bmap_name = 'bmap0'
def test_migration_without_alias(self) -> None:
self.migrate(self.src_node_name == self.dst_node_name and
self.src_bmap_name == self.dst_bmap_name)
# Check for error message on the destination
if self.src_node_name != self.dst_node_name:
self.verify_dest_error(f"Cannot find "
f"device={self.src_node_name} nor "
f"node_name={self.src_node_name}")
else:
self.verify_dest_error(None)
def test_alias_on_src_migration(self) -> None:
mapping = self.mapping(self.src_node_name, self.dst_node_name,
self.src_bmap_name, self.dst_bmap_name)
self.set_mapping(self.vm_a, mapping)
self.migrate()
self.verify_dest_error(None)
def test_alias_on_dst_migration(self) -> None:
mapping = self.mapping(self.dst_node_name, self.src_node_name,
self.dst_bmap_name, self.src_bmap_name)
self.set_mapping(self.vm_b, mapping)
self.migrate()
self.verify_dest_error(None)
def test_alias_on_both_migration(self) -> None:
src_map = self.mapping(self.src_node_name, 'node-alias',
self.src_bmap_name, 'bmap-alias')
dst_map = self.mapping(self.dst_node_name, 'node-alias',
self.dst_bmap_name, 'bmap-alias')
self.set_mapping(self.vm_a, src_map)
self.set_mapping(self.vm_b, dst_map)
self.migrate()
self.verify_dest_error(None)
class TestNodeAliasMigration(TestAliasMigration):
src_node_name = 'node-src'
dst_node_name = 'node-dst'
class TestBitmapAliasMigration(TestAliasMigration):
src_bmap_name = 'bmap-src'
dst_bmap_name = 'bmap-dst'
class TestFullAliasMigration(TestAliasMigration):
src_node_name = 'node-src'
dst_node_name = 'node-dst'
src_bmap_name = 'bmap-src'
dst_bmap_name = 'bmap-dst'
class TestLongBitmapNames(TestAliasMigration):
# Giving long bitmap names is OK, as long as there is a short alias for
# migration
src_bmap_name = 'a' * 512
dst_bmap_name = 'b' * 512
# Skip all tests that do not use the intermediate alias
def test_migration_without_alias(self) -> None:
pass
def test_alias_on_src_migration(self) -> None:
pass
def test_alias_on_dst_migration(self) -> None:
pass
class TestBlockBitmapMappingErrors(TestDirtyBitmapMigration):
src_node_name = 'node0'
dst_node_name = 'node0'
src_bmap_name = 'bmap0'
dst_bmap_name = 'bmap0'
"""
Note that mapping nodes or bitmaps that do not exist is not an error.
"""
def test_non_injective_node_mapping(self) -> None:
mapping: BlockBitmapMapping = [
{
'node-name': 'node0',
'alias': 'common-alias',
'bitmaps': [{
'name': 'bmap0',
'alias': 'bmap-alias0'
}]
},
{
'node-name': 'node1',
'alias': 'common-alias',
'bitmaps': [{
'name': 'bmap1',
'alias': 'bmap-alias1'
}]
}
]
self.set_mapping(self.vm_a, mapping,
"Invalid mapping given for block-bitmap-mapping: "
"The node alias 'common-alias' is used twice")
def test_non_injective_bitmap_mapping(self) -> None:
mapping: BlockBitmapMapping = [{
'node-name': 'node0',
'alias': 'node-alias0',
'bitmaps': [
{
'name': 'bmap0',
'alias': 'common-alias'
},
{
'name': 'bmap1',
'alias': 'common-alias'
}
]
}]
self.set_mapping(self.vm_a, mapping,
"Invalid mapping given for block-bitmap-mapping: "
"The bitmap alias 'node-alias0'/'common-alias' is "
"used twice")
def test_ambiguous_node_mapping(self) -> None:
mapping: BlockBitmapMapping = [
{
'node-name': 'node0',
'alias': 'node-alias0',
'bitmaps': [{
'name': 'bmap0',
'alias': 'bmap-alias0'
}]
},
{
'node-name': 'node0',
'alias': 'node-alias1',
'bitmaps': [{
'name': 'bmap0',
'alias': 'bmap-alias0'
}]
}
]
self.set_mapping(self.vm_a, mapping,
"Invalid mapping given for block-bitmap-mapping: "
"The node name 'node0' is mapped twice")
def test_ambiguous_bitmap_mapping(self) -> None:
mapping: BlockBitmapMapping = [{
'node-name': 'node0',
'alias': 'node-alias0',
'bitmaps': [
{
'name': 'bmap0',
'alias': 'bmap-alias0'
},
{
'name': 'bmap0',
'alias': 'bmap-alias1'
}
]
}]
self.set_mapping(self.vm_a, mapping,
"Invalid mapping given for block-bitmap-mapping: "
"The bitmap 'node0'/'bmap0' is mapped twice")
def test_migratee_node_is_not_mapped_on_src(self) -> None:
self.set_mapping(self.vm_a, [])
# Should just ignore all bitmaps on unmapped nodes
self.migrate(False)
self.verify_dest_error(None)
def test_migratee_node_is_not_mapped_on_dst(self) -> None:
self.set_mapping(self.vm_b, [])
self.migrate(False)
self.verify_dest_error(f"Unknown node alias '{self.src_node_name}'")
def test_migratee_bitmap_is_not_mapped_on_src(self) -> None:
mapping: BlockBitmapMapping = [{
'node-name': self.src_node_name,
'alias': self.dst_node_name,
'bitmaps': []
}]
self.set_mapping(self.vm_a, mapping)
# Should just ignore all unmapped bitmaps
self.migrate(False)
self.verify_dest_error(None)
def test_migratee_bitmap_is_not_mapped_on_dst(self) -> None:
mapping: BlockBitmapMapping = [{
'node-name': self.dst_node_name,
'alias': self.src_node_name,
'bitmaps': []
}]
self.set_mapping(self.vm_b, mapping)
self.migrate(False)
self.verify_dest_error(f"Unknown bitmap alias "
f"'{self.src_bmap_name}' "
f"on node '{self.dst_node_name}' "
f"(alias '{self.src_node_name}')")
def test_unused_mapping_on_dst(self) -> None:
# Let the source not send any bitmaps
self.set_mapping(self.vm_a, [])
# Establish some mapping on the destination
self.set_mapping(self.vm_b, [])
# The fact that there is a mapping on B without any bitmaps
# being received should be fine, not fatal
self.migrate(False)
self.verify_dest_error(None)
def test_non_wellformed_node_alias(self) -> None:
alias = '123-foo'
mapping: BlockBitmapMapping = [{
'node-name': self.src_node_name,
'alias': alias,
'bitmaps': []
}]
self.set_mapping(self.vm_a, mapping,
f"Invalid mapping given for block-bitmap-mapping: "
f"The node alias '{alias}' is not well-formed")
def test_node_alias_too_long(self) -> None:
alias = 'a' * 256
mapping: BlockBitmapMapping = [{
'node-name': self.src_node_name,
'alias': alias,
'bitmaps': []
}]
self.set_mapping(self.vm_a, mapping,
f"Invalid mapping given for block-bitmap-mapping: "
f"The node alias '{alias}' is longer than 255 bytes")
def test_bitmap_alias_too_long(self) -> None:
alias = 'a' * 256
mapping = self.mapping(self.src_node_name, self.dst_node_name,
self.src_bmap_name, alias)
self.set_mapping(self.vm_a, mapping,
f"Invalid mapping given for block-bitmap-mapping: "
f"The bitmap alias '{alias}' is longer than 255 "
f"bytes")
def test_bitmap_name_too_long(self) -> None:
name = 'a' * 256
result = self.vm_a.qmp('block-dirty-bitmap-add',
node=self.src_node_name,
name=name)
self.assert_qmp(result, 'return', {})
self.migrate(False, False)
# Check for the error in the source's log
self.vm_a.shutdown()
self.assertIn(f"Cannot migrate bitmap '{name}' on node "
f"'{self.src_node_name}': Name is longer than 255 bytes",
self.vm_a.get_log())
# Expect abnormal shutdown of the destination VM because of
# the failed migration
try:
self.vm_b.shutdown()
except qemu.machine.AbnormalShutdown:
pass
def test_aliased_bitmap_name_too_long(self) -> None:
# Longer than the maximum for bitmap names
self.dst_bmap_name = 'a' * 1024
mapping = self.mapping(self.dst_node_name, self.src_node_name,
self.dst_bmap_name, self.src_bmap_name)
# We would have to create this bitmap during migration, and
# that would fail, because the name is too long. Better to
# catch it early.
self.set_mapping(self.vm_b, mapping,
f"Invalid mapping given for block-bitmap-mapping: "
f"The bitmap name '{self.dst_bmap_name}' is longer "
f"than 1023 bytes")
def test_node_name_too_long(self) -> None:
# Longer than the maximum for node names
self.dst_node_name = 'a' * 32
mapping = self.mapping(self.dst_node_name, self.src_node_name,
self.dst_bmap_name, self.src_bmap_name)
# During migration, this would appear simply as a node that
# cannot be found. Still better to catch impossible node
# names early (similar to test_non_wellformed_node_alias).
self.set_mapping(self.vm_b, mapping,
f"Invalid mapping given for block-bitmap-mapping: "
f"The node name '{self.dst_node_name}' is longer "
f"than 31 bytes")
class TestCrossAliasMigration(TestDirtyBitmapMigration):
"""
Swap aliases, both to see that qemu does not get confused, and
that we can migrate multiple things at once.
So we migrate this:
node-a.bmap-a -> node-b.bmap-b
node-a.bmap-b -> node-b.bmap-a
node-b.bmap-a -> node-a.bmap-b
node-b.bmap-b -> node-a.bmap-a
"""
src_node_name = 'node-a'
dst_node_name = 'node-b'
src_bmap_name = 'bmap-a'
dst_bmap_name = 'bmap-b'
def setUp(self) -> None:
TestDirtyBitmapMigration.setUp(self)
# Now create another block device and let both have two bitmaps each
result = self.vm_a.qmp('blockdev-add',
node_name='node-b', driver='null-co')
self.assert_qmp(result, 'return', {})
result = self.vm_b.qmp('blockdev-add',
node_name='node-a', driver='null-co')
self.assert_qmp(result, 'return', {})
bmaps_to_add = (('node-a', 'bmap-b'),
('node-b', 'bmap-a'),
('node-b', 'bmap-b'))
for (node, bmap) in bmaps_to_add:
result = self.vm_a.qmp('block-dirty-bitmap-add',
node=node, name=bmap)
self.assert_qmp(result, 'return', {})
@staticmethod
def cross_mapping() -> BlockBitmapMapping:
return [
{
'node-name': 'node-a',
'alias': 'node-b',
'bitmaps': [
{
'name': 'bmap-a',
'alias': 'bmap-b'
},
{
'name': 'bmap-b',
'alias': 'bmap-a'
}
]
},
{
'node-name': 'node-b',
'alias': 'node-a',
'bitmaps': [
{
'name': 'bmap-b',
'alias': 'bmap-a'
},
{
'name': 'bmap-a',
'alias': 'bmap-b'
}
]
}
]
def verify_dest_has_all_bitmaps(self) -> None:
bitmaps = self.vm_b.query_bitmaps()
# Extract and sort bitmap names
for node in bitmaps:
bitmaps[node] = sorted((bmap['name'] for bmap in bitmaps[node]))
self.assertEqual(bitmaps,
{'node-a': ['bmap-a', 'bmap-b'],
'node-b': ['bmap-a', 'bmap-b']})
def test_alias_on_src(self) -> None:
self.set_mapping(self.vm_a, self.cross_mapping())
# Checks that node-a.bmap-a was migrated to node-b.bmap-b, and
# that is enough
self.migrate()
self.verify_dest_has_all_bitmaps()
self.verify_dest_error(None)
def test_alias_on_dst(self) -> None:
self.set_mapping(self.vm_b, self.cross_mapping())
# Checks that node-a.bmap-a was migrated to node-b.bmap-b, and
# that is enough
self.migrate()
self.verify_dest_has_all_bitmaps()
self.verify_dest_error(None)
if __name__ == '__main__':
iotests.main(supported_protocols=['file'])
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