livepatch: Move tests from lib/livepatch to selftests/livepatch

The modules are being moved from lib/livepatch to
tools/testing/selftests/livepatch/test_modules.

This code moving will allow writing

livepatch: Move tests from lib/livepatch to selftests/livepatch

The modules are being moved from lib/livepatch to
tools/testing/selftests/livepatch/test_modules.

This code moving will allow writing more complex tests, like for example an
userspace C code that will call a livepatched kernel function.

The modules are now built as out-of-tree
modules, but being part of the kernel source means they will be maintained.

Another advantage of the code moving is to be able to easily change,
debug and rebuild the tests by running make on the selftests/livepatch
directory, which is not currently possible since the modules on
lib/livepatch are build and installed using the "modules" target.

The current approach also keeps the ability to execute the tests manually
by executing the scripts inside selftests/livepatch directory, as it's
currently supported. If the modules are modified, they needed to be
rebuilt before running the scripts though.

The modules are built before running the selftests when using the
kselftest invocations:

make kselftest TARGETS=livepatch
or
make -C tools/testing/selftests/livepatch run_tests

Having the modules being built as out-of-modules requires changing the
currently used 'modprobe' by 'insmod' and adapt the test scripts that
check for the kernel message buffer.

Now it is possible to only compile the modules by running:

make -C tools/testing/selftests/livepatch/

This way the test modules and other test program can be built in order
to be packaged if so desired.

As there aren't any modules being built on lib/livepatch, remove the
TEST_LIVEPATCH Kconfig and it's references.

Note: "make gen_tar" packages the pre-built binaries into the tarball.
It means that it will store the test modules pre-built for
the kernel running on the build host.

Note that these modules need not binary compatible with
the kernel built from the same sources. But the same
is true for other packaged selftest binaries.

The entire kernel sources are needed for rebuilding
the selftests on another system.

Reviewed-by: Joe Lawrence <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Marcos Paulo de Souza <[email protected]>
Acked-by: Alexander Gordeev <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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selftests/livepatch: Don't clear dmesg when running tests

Inspired by commit f131d9edc29d ("selftests/lkdtm: Don't clear dmesg
when running tests"), keep a reference dmesg copy when beginning each
t

selftests/livepatch: Don't clear dmesg when running tests

Inspired by commit f131d9edc29d ("selftests/lkdtm: Don't clear dmesg
when running tests"), keep a reference dmesg copy when beginning each
test. This way check_result() can compare against the initial copy
rather than relying upon an empty log.

Signed-off-by: Joe Lawrence <[email protected]>
Reviewed-by: Kamalesh Babulal <[email protected]>
Reviewed-by: Yannick Cote <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Acked-by: Miroslav Benes <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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selftests/livepatch: more verification in test-klp-shadow-vars

This change makes the test feel more familiar with narrowing to a
typical usage by operating on a number of identical structure instanc

selftests/livepatch: more verification in test-klp-shadow-vars

This change makes the test feel more familiar with narrowing to a
typical usage by operating on a number of identical structure instances
and populating the same two new shadow variables symmetrically while
keeping the same testing and verification criteria for the extra
variables.

Signed-off-by: Yannick Cote <[email protected]>
Reviewed-by: Kamalesh Babulal <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Acked-by: Miroslav Benes <[email protected]>
Acked-by: Joe Lawrence <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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selftests/livepatch: Make dynamic debug setup and restore generic

Livepatch selftests currently save the current dynamic debug config and
tweak it for the selftests. The config is restored at the en

selftests/livepatch: Make dynamic debug setup and restore generic

Livepatch selftests currently save the current dynamic debug config and
tweak it for the selftests. The config is restored at the end. Make the
infrastructure generic, so that more variables can be saved and
restored.

Link: http://lkml.kernel.org/r/[email protected]

Signed-off-by: Joe Lawrence <[email protected]>
Signed-off-by: Miroslav Benes <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

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selftests/livepatch: introduce tests

Add a few livepatch modules and simple target modules that the included
regression suite can run tests against:

- basic livepatching (multiple patches, atomic

selftests/livepatch: introduce tests

Add a few livepatch modules and simple target modules that the included
regression suite can run tests against:

- basic livepatching (multiple patches, atomic replace)
- pre/post (un)patch callbacks
- shadow variable API

Signed-off-by: Joe Lawrence <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Tested-by: Miroslav Benes <[email protected]>
Tested-by: Alice Ferrazzi <[email protected]>
Acked-by: Joe Lawrence <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

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