1==================== 2Livepatch Self Tests 3==================== 4 5This is a small set of sanity tests for the kernel livepatching. 6 7The test suite loads and unloads several test kernel modules to verify 8livepatch behavior. Debug information is logged to the kernel's message 9buffer and parsed for expected messages. (Note: the tests will compare 10the message buffer for only the duration of each individual test.) 11 12 13Config 14------ 15 16Set CONFIG_LIVEPATCH=y option and it's prerequisites. 17 18 19Building the tests 20------------------ 21 22To only build the tests without running them, run: 23 24 % make -C tools/testing/selftests/livepatch 25 26The command above will compile all test modules and test programs, making them 27ready to be packaged if so desired. 28 29Running the tests 30----------------- 31 32Test kernel modules are built before running the livepatch selftests. The 33modules are located under test_modules directory, and are built as out-of-tree 34modules. This is specially useful since the same sources can be built and 35tested on systems with different kABI, ensuring they the tests are backwards 36compatible. The modules will be loaded by the test scripts using insmod. 37 38To run the livepatch selftests, from the top of the kernel source tree: 39 40 % make -C tools/testing/selftests TARGETS=livepatch run_tests 41 42or 43 44 % make kselftest TARGETS=livepatch 45 46 47Adding tests 48------------ 49 50See the common functions.sh file for the existing collection of utility 51functions, most importantly setup_config(), start_test() and 52check_result(). The latter function greps the kernel's ring buffer for 53"livepatch:" and "test_klp" strings, so tests be sure to include one of 54those strings for result comparison. Other utility functions include 55general module loading and livepatch loading helpers (waiting for patch 56transitions, sysfs entries, etc.) 57