[PATCH] Add livepatch kselftests

[Joe Lawrence]

Hi all,

This patch was motivated by the increasing corner cases in the livepatch
code.  These tests don't cover anywhere near all of them, but were
mostly already written up as demonstrations / documentation of the
livepatch callback functionality.  Converting them into a test rig
didn't take long.

So the testing methodology is a little hokey as it relies on dmesg order
and filtering.  That said, it's already been used to verify livepatch
callback for "livepatch: Atomic replace feature" patchset.  Any
suggestions for better testing would be welcome.

I didn't get to the shadow variable testing script yet.  I figured that
I'd share the current state before I got too far along in writing tests.
Suggestions for additional tests and test categories welcome as well.

To try out the tests, configure with:
CONFIG_TEST_LIVEPATCH=m
  
Build kernel, modules, install, etc. then reboot and kick off:
% make -C tools/testing/selftests TARGETS=livepatch run_tests

The tests expect to on top of v10+ of the "livepatch: Atomic replace
feature" series and take ~2.5 minutes to complete.

rfc changes:
- SPDX-License-Identifiers
- Moved livepatch test modules into lib/livepatch
- Renamed livepatch.sh (filename suffix)
- Reduced between-test delay time
- Split off common functions.sh file
- Split into separate livepatch, callbacks, and shadow-vars scrips
- Gave the tests short descriptions instead of TEST1, TEST2, etc.

Joe Lawrence (1):
  selftests/livepatch: introduce tests

 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  18 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 ++++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 202 ++++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 526 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 177 +++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  13 +
 16 files changed, 1394 insertions(+)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

-- 
1.8.3.1