| #!/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, Union |
| |
| import iotests |
| |
| # Import qemu after iotests.py has amended sys.path |
| # pylint: disable=wrong-import-order |
| import qemu |
| |
| BlockBitmapMapping = List[Dict[str, Union[str, List[Dict[str, str]]]]] |
| |
| 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 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']) |
