Re: [PATCH for-5.2 v3 0/3] migration: Add block-bitmap-mapping parameter

[Max Reitz]

Ping – seems like everyone found v2 more or less acceptable bar the
failing assertion in patch 1, and some aspects of the test.  How about
v3, are there any objections?

On 22.07.20 10:05, Max Reitz wrote:
> RFC v1: https://lists.nongnu.org/archive/html/qemu-block/2020-05/msg00912.html
> RFC v2: https://lists.nongnu.org/archive/html/qemu-block/2020-05/msg00915.html
> v1: https://lists.nongnu.org/archive/html/qemu-devel/2020-06/msg09792.html
> v2: https://lists.nongnu.org/archive/html/qemu-block/2020-07/msg01179.html
> 
> Branch: https://github.com/XanClic/qemu.git migration-bitmap-mapping-v3
> Branch: https://git.xanclic.moe/XanClic/qemu.git migration-bitmap-mapping-v3
> 
> Hi,
> 
> This new migration parameter allows mapping block node names and bitmap
> names to aliases for the purpose of block dirty bitmap migration.
> 
> This way, management tools can use different node names on the source
> and destination and pass the mapping of how bitmaps are to be
> transferred to qemu (on the source, the destination, or even both with
> arbitrary aliases in the migration stream).
> 
> 
> v3:
> - Patch 1:
>   - Add notes on the fact that the destination won’t ever know about any
>     bitmaps that aren’t sent, so you can freely drop what you want, and
>     you’re completely free in renaming bitmaps and putting them on
>     “other” nodes (whatever “other” node means in the context of
>     migration, because that’s kind of one of the problems this series is
>     trying to solve: The fact that you can’t trivially match nodes
>     between source and destination)
>   - Fix an assertion
> 
> - Patch 2: s/pass/time.sleep(0.2)/
> 
> - Patch 3:
>   - Add copyright line
>   - Use format string instead of %
>   - s/pass/time.sleep(0.1)/
>   - s/wait_for_runstate/wait_migration/ on the destination to wait for
>     the migration to actually complete
>   - Replace the “info migrate_parameters” parsing code by a multiline
>     regex
>   - Test what happens when the destination has a mapping that isn’t used
>     because there are not bitmaps to be transferred (which breaks the
>     assertion in patch 1 as it was in v2)
>   - Let verify_dest_has_all_bitmaps() actually verify the bitmaps on the
>     destination instead of the source
> 
> 
> git-backport-diff against v2:
> 
> Key:
> [----] : patches are identical
> [####] : number of functional differences between upstream/downstream patch
> [down] : patch is downstream-only
> The flags [FC] indicate (F)unctional and (C)ontextual differences, 
> respectively
> 
> 001/3:[0014] [FC] 'migration: Add block-bitmap-mapping parameter'
> 002/3:[0003] [FC] 'iotests.py: Add wait_for_runstate()'
> 003/3:[0046] [FC] 'iotests: Test node/bitmap aliases during migration'
> 
> 
> Max Reitz (3):
>   migration: Add block-bitmap-mapping parameter
>   iotests.py: Add wait_for_runstate()
>   iotests: Test node/bitmap aliases during migration
> 
>  qapi/migration.json            | 104 ++++++-
>  migration/migration.h          |   3 +
>  migration/block-dirty-bitmap.c | 373 ++++++++++++++++++++----
>  migration/migration.c          |  30 ++
>  monitor/hmp-cmds.c             |  30 ++
>  tests/qemu-iotests/300         | 515 +++++++++++++++++++++++++++++++++
>  tests/qemu-iotests/300.out     |   5 +
>  tests/qemu-iotests/group       |   1 +
>  tests/qemu-iotests/iotests.py  |   5 +
>  9 files changed, 1011 insertions(+), 55 deletions(-)
>  create mode 100755 tests/qemu-iotests/300
>  create mode 100644 tests/qemu-iotests/300.out
>

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