linux-kernel - Re: [PATCH v4 0/3] xen-blk{back,front}: Fix two bugs in 'feature

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Date:   Mon, 18 Jul 2022 19:12:21 +0300
From:   Andrii Chepurnyi <andrii.chepurnyi82@...il.com>
To:     SeongJae Park <sj@...nel.org>
Cc:     roger.pau@...rix.com, axboe@...nel.dk, boris.ostrovsky@...cle.com,
        jgross@...e.com, Oleksandr <olekstysh@...il.com>, mheyne@...zon.de,
        xen-devel@...ts.xenproject.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v4 0/3] xen-blk{back,front}: Fix two bugs in 'feature_persistent'

Hello SeongJae,

Thanks for the efforts.
I've tested backend patches(1,2) on my custom 5.10 kernel (since I
can't test on vanilla) and it works for me.

Best regards,
Andrii


On Sat, Jul 16, 2022 at 1:51 AM SeongJae Park <sj@...nel.org> wrote:
>
> Introduction of 'feature_persistent' made two bugs.  First one is wrong
> overwrite of 'vbd->feature_gnt_persistent' in 'blkback' due to wrong
> parameter value caching position, and the second one is unintended
> behavioral change that could break previous dynamic frontend/backend
> persistent feature support changes.  This patchset fixes the issues.
>
> Changes from v3
> (https://lore.kernel.org/xen-devel/20220715175521.126649-1-sj@kernel.org/)
> - Split 'blkback' patch for each of the two issues
> - Add 'Reported-by: Andrii Chepurnyi <andrii.chepurnyi82@...il.com>'
>
> Changes from v2
> (https://lore.kernel.org/xen-devel/20220714224410.51147-1-sj@kernel.org/)
> - Keep the behavioral change of v1
> - Update blkfront's counterpart to follow the changed behavior
> - Update documents for the changed behavior
>
> Changes from v1
> (https://lore.kernel.org/xen-devel/20220106091013.126076-1-mheyne@amazon.de/)
> - Avoid the behavioral change
>   (https://lore.kernel.org/xen-devel/20220121102309.27802-1-sj@kernel.org/)
> - Rebase on latest xen/tip/linux-next
> - Re-work by SeongJae Park <sj@...nel.org>
> - Cc stable@
>
> Maximilian Heyne (1):
>   xen-blkback: Apply 'feature_persistent' parameter when connect
>
> SeongJae Park (2):
>   xen-blkback: fix persistent grants negotiation
>   xen-blkfront: Apply 'feature_persistent' parameter when connect
>
>  .../ABI/testing/sysfs-driver-xen-blkback      |  2 +-
>  .../ABI/testing/sysfs-driver-xen-blkfront     |  2 +-
>  drivers/block/xen-blkback/xenbus.c            | 20 ++++++++-----------
>  drivers/block/xen-blkfront.c                  |  4 +---
>  4 files changed, 11 insertions(+), 17 deletions(-)
>
> --
> 2.25.1
>