Re: [PATCH hci-8.0/hci-8.1 0/2] migration/block-dirty-bitmap: fix postcopy abort with bitmaps on several nodes #VSTOR-147066

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

LGTM
Ack

On 9/24/26 3:13 PM, Denis V. Lunev wrote:
> Live migration of a VM with dirty bitmaps on more than one node aborts
> the destination once the bitmaps move post-copy:
> 
>   qemu-kvm: ../block.c:6477: bdrv_lookup_bs: Assertion
>   `qemu_in_main_thread()' failed.
> 
> libvirt triggers this on every such VM: a CBT backup leaves a persistent
> x-libvirt-cbt bitmap on each disk, and libvirt migrates bitmaps with
> dirty-bitmaps + migrate-start-postcopy. hci-upgrade hit it evacuating a
> three-disk VM, see VSTOR-147066 for the RCA.
> 
> This is the series posted upstream, unchanged apart from the ticket tag:
> https://lore.kernel.org/qemu-devel/20260924115611.4098417-1-den@openvz.org/
> 
> Both patches apply cleanly to hci-8.0 and hci-8.1. The VZ-only changes in
> migration/block-dirty-bitmap.c (PSBM-105022, VSTOR-98747) touch the save
> side only. The source-side runstate_set(-1) abort seen in the same
> ticket on hci-7.4 is already fixed here by 9867d4ddd04.
> 
> Denis V. Lunev (2):
>   migration/block-dirty-bitmap: fix postcopy abort with bitmaps on
>     several nodes #VSTOR-147066
>   iotests/migrate-bitmaps-postcopy-test: add a bitmap on a second node
>     #VSTOR-147066
> 
>  migration/block-dirty-bitmap.c                | 59 +++++++++++++++++--
>  .../tests/migrate-bitmaps-postcopy-test       | 19 ++++++
>  2 files changed, 74 insertions(+), 4 deletions(-)
> 
> 
> base-commit: e8a73d39faf578d58aa2c4b4b024226796c390e6