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3dae09de40
Add "stack_order" sysfs attribute which holds the order in which a live patch module was loaded into the system. A user can then determine an active live patched version of a function. cat /sys/kernel/livepatch/livepatch_1/stack_order -> 1 means that livepatch_1 is the first live patch applied cat /sys/kernel/livepatch/livepatch_module/stack_order -> N means that livepatch_module is the Nth live patch applied Suggested-by: Petr Mladek <pmladek@suse.com> Suggested-by: Miroslav Benes <mbenes@suse.cz> Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Wardenjohn <zhangwarden@gmail.com> Acked-by: Josh Poimboeuf <jpoimboe@kernel.org> Reviewed-by: Petr Mladek <pmladek@suse.com> Tested-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Link: https://lore.kernel.org/r/20241008014856.3729-2-zhangwarden@gmail.com [pmladek@suse.com: Updated kernel version and date in the ABI documentation.] Signed-off-by: Petr Mladek <pmladek@suse.com>
95 lines
3.1 KiB
Text
95 lines
3.1 KiB
Text
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>/stack_order
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Date: Jan 2025
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KernelVersion: 6.14.0
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Description:
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This attribute specifies the sequence in which live patch modules
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are applied to the system. If multiple live patches modify the same
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function, the implementation with the biggest 'stack_order' number
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is used, unless a transition is currently in progress.
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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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