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

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Date:   Fri, 15 Jul 2022 22:51:05 +0000
From:   SeongJae Park <sj@...nel.org>
To:     roger.pau@...rix.com
Cc:     axboe@...nel.dk, boris.ostrovsky@...cle.com, jgross@...e.com,
        olekstysh@...il.com, andrii.chepurnyi82@...il.com,
        mheyne@...zon.de, xen-devel@...ts.xenproject.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH v4 0/3] xen-blk{back,front}: Fix two bugs in 'feature_persistent'

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