Documentation/ABI/testing/sysfs-kernel-livepatch

   1 What:           /sys/kernel/livepatch
   2 Date:           Nov 2014
   3 KernelVersion:  3.19.0
   4 Contact:        live-patching@vger.kernel.org
   5 Description:
   6                 Interface for kernel live patching
   7
   8                 The /sys/kernel/livepatch directory contains subdirectories for
   9                 each loaded live patch module.
  10
  11 What:           /sys/kernel/livepatch/<patch>
  12 Date:           Nov 2014
  13 KernelVersion:  3.19.0
  14 Contact:        live-patching@vger.kernel.org
  15 Description:
  16                 The patch directory contains subdirectories for each kernel
  17                 object (vmlinux or a module) in which it patched functions.
  18
  19 What:           /sys/kernel/livepatch/<patch>/enabled
  20 Date:           Nov 2014
  21 KernelVersion:  3.19.0
  22 Contact:        live-patching@vger.kernel.org
  23 Description:
  24                 A writable attribute that indicates whether the patched
  25                 code is currently applied.  Writing 0 will disable the patch
  26                 while writing 1 will re-enable the patch.
  27
  28 What:           /sys/kernel/livepatch/<patch>/transition
  29 Date:           Feb 2017
  30 KernelVersion:  4.12.0
  31 Contact:        live-patching@vger.kernel.org
  32 Description:
  33                 An attribute which indicates whether the patch is currently in
  34                 transition.
  35
  36 What:           /sys/kernel/livepatch/<patch>/force
  37 Date:           Nov 2017
  38 KernelVersion:  4.15.0
  39 Contact:        live-patching@vger.kernel.org
  40 Description:
  41                 A writable attribute that allows administrator to affect the
  42                 course of an existing transition. Writing 1 clears
  43                 TIF_PATCH_PENDING flag of all tasks and thus forces the tasks to
  44                 the patched or unpatched state. Administrator should not
  45                 use this feature without a clearance from a patch
  46                 distributor. Removal (rmmod) of patch modules is permanently
  47                 disabled when the feature is used. See
  48                 Documentation/livepatch/livepatch.rst for more information.
  49
  50 What:           /sys/kernel/livepatch/<patch>/<object>
  51 Date:           Nov 2014
  52 KernelVersion:  3.19.0
  53 Contact:        live-patching@vger.kernel.org
  54 Description:
  55                 The object directory contains subdirectories for each function
  56                 that is patched within the object.
  57
  58 What:           /sys/kernel/livepatch/<patch>/<object>/<function,sympos>
  59 Date:           Nov 2014
  60 KernelVersion:  3.19.0
  61 Contact:        live-patching@vger.kernel.org
  62 Description:
  63                 The function directory contains attributes regarding the
  64                 properties and state of the patched function.
  65
  66                 The directory name contains the patched function name and a
  67                 sympos number corresponding to the nth occurrence of the symbol
  68                 name in kallsyms for the patched object.
  69
  70                 There are currently no such attributes.