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+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+Run Tests with kunit_tool
+=========================
+
+We can either run KUnit tests using kunit_tool or can run tests
+manually, and then use kunit_tool to parse the results. To run tests
+manually, see: Documentation/dev-tools/kunit/run_manual.rst.
+As long as we can build the kernel, we can run KUnit.
+
+kunit_tool is a Python script which configures and builds a kernel, runs
+tests, and formats the test results.
+
+Run command:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py run
+
+We should see the following:
+
+.. code-block::
+
+ Generating .config...
+ Building KUnit kernel...
+ Starting KUnit kernel...
+
+We may want to use the following options:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py run --timeout=30 --jobs=`nproc --all
+
+- ``--timeout`` sets a maximum amount of time for tests to run.
+- ``--jobs`` sets the number of threads to build the kernel.
+
+kunit_tool will generate a ``.kunitconfig`` with a default
+configuration, if no other ``.kunitconfig`` file exists
+(in the build directory). In addition, it verifies that the
+generated ``.config`` file contains the ``CONFIG`` options in the
+``.kunitconfig``.
+It is also possible to pass a separate ``.kunitconfig`` fragment to
+kunit_tool. This is useful if we have several different groups of
+tests we want to run independently, or if we want to use pre-defined
+test configs for certain subsystems.
+
+To use a different ``.kunitconfig`` file (such as one
+provided to test a particular subsystem), pass it as an option:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py run --kunitconfig=fs/ext4/.kunitconfig
+
+To view kunit_tool flags (optional command-line arguments), run:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py run --help
+
+Create a ``.kunitconfig`` File
+===============================
+
+If we want to run a specific set of tests (rather than those listed
+in the KUnit ``defconfig``), we can provide Kconfig options in the
+``.kunitconfig`` file. For default .kunitconfig, see:
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/testing/kunit/configs/default.config.
+A ``.kunitconfig`` is a ``minconfig`` (a .config
+generated by running ``make savedefconfig``), used for running a
+specific set of tests. This file contains the regular Kernel configs
+with specific test targets. The ``.kunitconfig`` also
+contains any other config options required by the tests (For example:
+dependencies for features under tests, configs that enable/disable
+certain code blocks, arch configs and so on).
+
+To create a ``.kunitconfig``, using the KUnit ``defconfig``:
+
+.. code-block::
+
+ cd $PATH_TO_LINUX_REPO
+ cp tools/testing/kunit/configs/default.config .kunit/.kunitconfig
+
+We can then add any other Kconfig options. For example:
+
+.. code-block::
+
+ CONFIG_LIST_KUNIT_TEST=y
+
+kunit_tool ensures that all config options in ``.kunitconfig`` are
+set in the kernel ``.config`` before running the tests. It warns if we
+have not included the options dependencies.
+
+.. note:: Removing something from the ``.kunitconfig`` will
+ not rebuild the ``.config file``. The configuration is only
+ updated if the ``.kunitconfig`` is not a subset of ``.config``.
+ This means that we can use other tools
+ (For example: ``make menuconfig``) to adjust other config options.
+ The build dir needs to be set for ``make menuconfig`` to
+ work, therefore by default use ``make O=.kunit menuconfig``.
+
+Configure, Build, and Run Tests
+===============================
+
+If we want to make manual changes to the KUnit build process, we
+can run part of the KUnit build process independently.
+When running kunit_tool, from a ``.kunitconfig``, we can generate a
+``.config`` by using the ``config`` argument:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py config
+
+To build a KUnit kernel from the current ``.config``, we can use the
+``build`` argument:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py build
+
+If we already have built UML kernel with built-in KUnit tests, we
+can run the kernel, and display the test results with the ``exec``
+argument:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py exec
+
+The ``run`` command discussed in section: **Run Tests with kunit_tool**,
+is equivalent to running the above three commands in sequence.
+
+Parse Test Results
+==================
+
+KUnit tests output displays results in TAP (Test Anything Protocol)
+format. When running tests, kunit_tool parses this output and prints
+a summary. To see the raw test results in TAP format, we can pass the
+``--raw_output`` argument:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py run --raw_output
+
+If we have KUnit results in the raw TAP format, we can parse them and
+print the human-readable summary with the ``parse`` command for
+kunit_tool. This accepts a filename for an argument, or will read from
+standard input.
+
+.. code-block:: bash
+
+ # Reading from a file
+ ./tools/testing/kunit/kunit.py parse /var/log/dmesg
+ # Reading from stdin
+ dmesg | ./tools/testing/kunit/kunit.py parse
+
+Run Selected Test Suites
+========================
+
+By passing a bash style glob filter to the ``exec`` or ``run``
+commands, we can run a subset of the tests built into a kernel . For
+example: if we only want to run KUnit resource tests, use:
+
+.. code-block::
+
+ ./tools/testing/kunit/kunit.py run 'kunit-resource*'
+
+This uses the standard glob format with wildcard characters.
+
+Run Tests on qemu
+=================
+
+kunit_tool supports running tests on qemu as well as
+via UML. To run tests on qemu, by default it requires two flags:
+
+- ``--arch``: Selects a configs collection (Kconfig, qemu config options
+ and so on), that allow KUnit tests to be run on the specified
+ architecture in a minimal way. The architecture argument is same as
+ the option name passed to the ``ARCH`` variable used by Kbuild.
+ Not all architectures currently support this flag, but we can use
+ ``--qemu_config`` to handle it. If ``um`` is passed (or this flag
+ is ignored), the tests will run via UML. Non-UML architectures,
+ for example: i386, x86_64, arm and so on; run on qemu.
+
+- ``--cross_compile``: Specifies the Kbuild toolchain. It passes the
+ same argument as passed to the ``CROSS_COMPILE`` variable used by
+ Kbuild. As a reminder, this will be the prefix for the toolchain
+ binaries such as GCC. For example:
+
+ - ``sparc64-linux-gnu`` if we have the sparc toolchain installed on
+ our system.
+
+ - ``$HOME/toolchains/microblaze/gcc-9.2.0-nolibc/microblaze-linux/bin/microblaze-linux``
+ if we have downloaded the microblaze toolchain from the 0-day
+ website to a directory in our home directory called toolchains.
+
+If we want to run KUnit tests on an architecture not supported by
+the ``--arch`` flag, or want to run KUnit tests on qemu using a
+non-default configuration; then we can write our own``QemuConfig``.
+These ``QemuConfigs`` are written in Python. They have an import line
+``from..qemu_config import QemuArchParams`` at the top of the file.
+The file must contain a variable called ``QEMU_ARCH`` that has an
+instance of ``QemuArchParams`` assigned to it. See example in:
+``tools/testing/kunit/qemu_configs/x86_64.py``.
+
+Once we have a ``QemuConfig``, we can pass it into kunit_tool,
+using the ``--qemu_config`` flag. When used, this flag replaces the
+``--arch`` flag. For example: using
+``tools/testing/kunit/qemu_configs/x86_64.py``, the invocation appear
+as
+
+.. code-block:: bash
+
+ ./tools/testing/kunit/kunit.py run \
+ --timeout=60 \
+ --jobs=12 \
+ --qemu_config=./tools/testing/kunit/qemu_configs/x86_64.py
+
+To run existing KUnit tests on non-UML architectures, see:
+Documentation/dev-tools/kunit/non_uml.rst.
+
+Command-Line Arguments
+======================
+
+kunit_tool has a number of other command-line arguments which can
+be useful for our test environment. Below the most commonly used
+command line arguments:
+
+- ``--help``: Lists all available options. To list common options,
+ place ``--help`` before the command. To list options specific to that
+ command, place ``--help`` after the command.
+
+ .. note:: Different commands (``config``, ``build``, ``run``, etc)
+ have different supported options.
+- ``--build_dir``: Specifies kunit_tool build directory. It includes
+ the ``.kunitconfig``, ``.config`` files and compiled kernel.
+
+- ``--make_options``: Specifies additional options to pass to make, when
+ compiling a kernel (using ``build`` or ``run`` commands). For example:
+ to enable compiler warnings, we can pass ``--make_options W=1``.
+
+- ``--alltests``: Builds a UML kernel with all config options enabled
+ using ``make allyesconfig``. This allows us to run as many tests as
+ possible.
+
+ .. note:: It is slow and prone to breakage as new options are
+ added or modified. Instead, enable all tests
+ which have satisfied dependencies by adding
+ ``CONFIG_KUNIT_ALL_TESTS=y`` to your ``.kunitconfig``.