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livepatch: Add "replace" sysfs attribute

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There are situations when it might make sense to combine livepatches
with and without the atomic replace on the same system. For example,
the livepatch without the atomic replace might provide a hotfix
or extra tuning.

Managing livepatches on such systems might be challenging. And the
information which of the installed livepatches do not use the atomic
replace would be useful.

Add new sysfs interface 'replace'. It works as follows:

   $ cat /sys/kernel/livepatch/livepatch-non_replace/replace
   0

   $ cat /sys/kernel/livepatch/livepatch-replace/replace
   1

[ commit log improved by Petr ]

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lore.kernel.org/r/20240625151123.2750-2-laoar.shao@gmail.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Yafang Shao
2024-06-25 23:11:21 +08:00
committed by Petr Mladek
parent 8c06da67d0
commit adb68ed26a
2 changed files with 20 additions and 0 deletions
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8
Documentation/ABI/testing/sysfs-kernel-livepatch
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@@ -47,6 +47,14 @@ Description:
disabled when the feature is used. See
Documentation/livepatch/livepatch.rst for more information.
What: /sys/kernel/livepatch/<patch>/replace
Date: Jun 2024
KernelVersion: 6.11.0
Contact: live-patching@vger.kernel.org
Description:
An attribute which indicates whether the patch supports
atomic-replace.
What: /sys/kernel/livepatch/<patch>/<object>
Date: Nov 2014
KernelVersion: 3.19.0