adb68ed26a
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>
87 lines
2.7 KiB
Plaintext
87 lines
2.7 KiB
Plaintext
What: /sys/kernel/livepatch
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Date: Nov 2014
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KernelVersion: 3.19.0
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Contact: live-patching@vger.kernel.org
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Description:
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Interface for kernel live patching
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The /sys/kernel/livepatch directory contains subdirectories for
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each loaded live patch module.
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What: /sys/kernel/livepatch/<patch>
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Date: Nov 2014
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KernelVersion: 3.19.0
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Contact: live-patching@vger.kernel.org
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Description:
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The patch directory contains subdirectories for each kernel
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object (vmlinux or a module) in which it patched functions.
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What: /sys/kernel/livepatch/<patch>/enabled
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Date: Nov 2014
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KernelVersion: 3.19.0
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Contact: live-patching@vger.kernel.org
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Description:
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A writable attribute that indicates whether the patched
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code is currently applied. Writing 0 will disable the patch
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while writing 1 will re-enable the patch.
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What: /sys/kernel/livepatch/<patch>/transition
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Date: Feb 2017
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KernelVersion: 4.12.0
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Contact: live-patching@vger.kernel.org
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Description:
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An attribute which indicates whether the patch is currently in
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transition.
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What: /sys/kernel/livepatch/<patch>/force
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Date: Nov 2017
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KernelVersion: 4.15.0
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Contact: live-patching@vger.kernel.org
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Description:
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A writable attribute that allows administrator to affect the
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course of an existing transition. Writing 1 clears
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TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to
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the patched or unpatched state. Administrator should not
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use this feature without a clearance from a patch
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distributor. Removal (rmmod) of patch modules is permanently
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disabled when the feature is used. See
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Documentation/livepatch/livepatch.rst for more information.
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What: /sys/kernel/livepatch/<patch>/replace
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Date: Jun 2024
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KernelVersion: 6.11.0
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Contact: live-patching@vger.kernel.org
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Description:
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An attribute which indicates whether the patch supports
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atomic-replace.
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What: /sys/kernel/livepatch/<patch>/<object>
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Date: Nov 2014
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KernelVersion: 3.19.0
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Contact: live-patching@vger.kernel.org
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Description:
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The object directory contains subdirectories for each function
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that is patched within the object.
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What: /sys/kernel/livepatch/<patch>/<object>/patched
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Date: August 2022
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KernelVersion: 6.1.0
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Contact: live-patching@vger.kernel.org
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Description:
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An attribute which indicates whether the object is currently
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patched.
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What: /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
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Date: Nov 2014
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KernelVersion: 3.19.0
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Contact: live-patching@vger.kernel.org
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Description:
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The function directory contains attributes regarding the
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properties and state of the patched function.
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The directory name contains the patched function name and a
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sympos number corresponding to the nth occurrence of the symbol
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name in kallsyms for the patched object.
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There are currently no such attributes.
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