[RFC PATCH 00/41] qemu: Rewrite checkpoint code for 'block-dirty-bitmap-populate'

Peter Krempa pkrempa at redhat.com
Thu Jun 11 06:57:02 UTC 2020

On Tue, Jun 09, 2020 at 17:00:07 +0200, Peter Krempa wrote:
> Use 'block-dirty-bitmap-populate' and change how we create bitmaps
> corresponding to checkpoints to simplify the code and also properly
> integrate with backing chain images created outside of libvirt.
> This patchset changes how we approach checkpoints by keeping one bitmap
> per checkpoint and disk and not propagating the bitmaps into overlays on
> snapshots. This massively simplifies the code handling all the
> operations during blockjobs and backups.
> While the change isn't compatible with checkpoints created previously,
> we didn't yet enable the support for checkpoints/backups.
> Note that 'block-dirty-bitmap-populate' is _not_ in finished state in
> qemu yet, so I'm posting this as RFC and as reference for qemu
> developers of the usefulnes of it.
> The changes can be fetched by:
>   git fetch https://gitlab.com/pipo.sk/libvirt.git checkpoint-bitmap-populate
> Note that the above branch also contains a commit enabling incremental
> backup for simpler testing.
> I've pushed the appropriate qemu patches for convenience here:
>   git fetch https://gitlab.com/pipo.sk/qemu.git block-dirty-bitmap-populate

I'll be posting a new version which doesn't require the
'block-dirty-bitmap-populate' blockjob at the beginning but still
simplifies the internals and I'll then base the rest of this series on
top of that once the qemu design is ready.

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