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xemu/tests/qemu-iotests/300
John Snow beb6b57b3b python: create qemu packages 
move python/qemu/*.py to python/qemu/[machine, qmp, utils]/*.py and
update import directives across the tree.

This is done to create a PEP420 namespace package, in which we may
create subpackages. To do this, the namespace directory ("qemu") should
not have any modules in it. Those files will go into new 'machine',
'qmp' and 'utils' subpackages instead.

Implement machine/__init__.py making the top-level classes and functions
from its various modules available directly inside the package. Change
qmp.py to qmp/__init__.py similarly, such that all of the useful QMP
library classes are available directly from "qemu.qmp" instead of
"qemu.qmp.qmp".

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Cleber Rosa <crosa@redhat.com>
Message-id: 20210527211715.394144-10-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
2021-06-01 16:21:21 -04:00

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#!/usr/bin/env python3
# group: migration
#
# 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
import iotests
# Import qemu after iotests.py has amended sys.path
# pylint: disable=wrong-import-order
from qemu.machine import machine
BlockBitmapMapping = List[Dict[str, object]]
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()
log = self.vm_b.get_log()
assert log is not None # Loaded after shutdown
if msg is None:
self.assertNotIn('qemu-system-', log)
else:
self.assertIn(msg, 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()
log = self.vm_a.get_log()
assert log is not None # Loaded after shutdown
self.assertIn(f"Cannot migrate bitmap '{name}' on node "
f"'{self.src_node_name}': Name is longer than 255 bytes",
log)
# Expect abnormal shutdown of the destination VM because of
# the failed migration
try:
self.vm_b.shutdown()
except 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)
class TestAliasTransformMigration(TestDirtyBitmapMigration):
"""
Tests the 'transform' option which modifies bitmap persistence on
migration.
"""
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',
read_zeroes=False)
self.assert_qmp(result, 'return', {})
result = self.vm_b.qmp('blockdev-add',
node_name='node-a', driver='null-co',
read_zeroes=False)
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 transform_mapping() -> BlockBitmapMapping:
return [
{
'node-name': 'node-a',
'alias': 'node-a',
'bitmaps': [
{
'name': 'bmap-a',
'alias': 'bmap-a',
'transform':
{
'persistent': True
}
},
{
'name': 'bmap-b',
'alias': 'bmap-b'
}
]
},
{
'node-name': 'node-b',
'alias': 'node-b',
'bitmaps': [
{
'name': 'bmap-a',
'alias': 'bmap-a'
},
{
'name': 'bmap-b',
'alias': 'bmap-b'
}
]
}
]
def verify_dest_bitmap_state(self) -> None:
bitmaps = self.vm_b.query_bitmaps()
for node in bitmaps:
bitmaps[node] = sorted(((bmap['name'], bmap['persistent'])
for bmap in bitmaps[node]))
self.assertEqual(bitmaps,
{'node-a': [('bmap-a', True), ('bmap-b', False)],
'node-b': [('bmap-a', False), ('bmap-b', False)]})
def test_transform_on_src(self) -> None:
self.set_mapping(self.vm_a, self.transform_mapping())
self.migrate()
self.verify_dest_bitmap_state()
self.verify_dest_error(None)
def test_transform_on_dst(self) -> None:
self.set_mapping(self.vm_b, self.transform_mapping())
self.migrate()
self.verify_dest_bitmap_state()
self.verify_dest_error(None)
if __name__ == '__main__':
iotests.main(supported_protocols=['file'])
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