linux-kernel - [PATCH v2 0/4] livepatch: Add garbage collection for shadow variables

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Date:   Wed, 26 Oct 2022 16:41:18 -0300
From:   Marcos Paulo de Souza <mpdesouza@...e.com>
To:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org
Cc:     jpoimboe@...hat.com, joe.lawrence@...hat.com, pmladek@...e.com,
        Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: [PATCH v2 0/4] livepatch: Add garbage collection for shadow variables

Hello,

This is the v2 of the livepatch shadow GC patches. The changes are minor since
nobody asked for for big code changes.

Changes from v1:
* Reworked commit messages (Petr)
* Added my SoB which was missing in some patches, or the ordering was wrong. (Josh)
* Change __klp_shadow_get_or_use to __klp_shadow_get_or_add_locked and add a comment (Petr)
* Add lockdep_assert_held on __klp_shadow_get_or_add_locked (Petr)
  about it's meaning (Petr)
* CCing LKML (Josh)

Some observations:
* Petr has reviewed some of the patches that we created. I kept the Reviewed-by
  tags since he wrote the patches some time ago and now he reviewed them again
  on the ML.
* There were questions about possible problems about using klp_shadow_types
  instead of using ids, but Petr already explained that internally it still uses
  the id to find the correct livepatch.
* Regarding the possibility of multiple patches use the same ID, the problem
  already existed before. Petr suggested using a "stringified" version using
  name and id, but nobody has commented yet. I can implement such feature in a
  v3 if necessary.

Marcos Paulo de Souza (2):
  livepatch/shadow: Introduce klp_shadow_type structure
  livepatch/shadow: Add garbage collection of shadow variables

Petr Mladek (2):
  livepatch/shadow: Separate code to get or use pre-allocated shadow
    variable
  livepatch/shadow: Separate code removing all shadow variables for a
    given id

 include/linux/livepatch.h                     |  50 ++-
 kernel/livepatch/core.c                       |  39 +++
 kernel/livepatch/core.h                       |   1 +
 kernel/livepatch/shadow.c                     | 297 +++++++++++++-----
 kernel/livepatch/transition.c                 |   4 +-
 lib/livepatch/test_klp_shadow_vars.c          | 119 ++++---
 samples/livepatch/livepatch-shadow-fix1.c     |  24 +-
 samples/livepatch/livepatch-shadow-fix2.c     |  34 +-
 .../selftests/livepatch/test-shadow-vars.sh   |   2 +-
 9 files changed, 417 insertions(+), 153 deletions(-)

-- 
2.37.3