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| -rw-r--r-- | docs/devel/acpi-bits.rst | 145 | ||||
| -rw-r--r-- | docs/devel/index-build.rst | 1 |
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diff --git a/docs/devel/acpi-bits.rst b/docs/devel/acpi-bits.rst new file mode 100644 index 0000000000..c9564d871a --- /dev/null +++ b/docs/devel/acpi-bits.rst @@ -0,0 +1,145 @@ +============================================================================= +ACPI/SMBIOS avocado tests using biosbits +============================================================================= + +Biosbits is a software written by Josh Triplett that can be downloaded +from https://biosbits.org/. The github codebase can be found +`here <https://github.com/biosbits/bits/tree/master>`__. It is a software that executes +the bios components such as acpi and smbios tables directly through acpica +bios interpreter (a freely available C based library written by Intel, +downloadable from https://acpica.org/ and is included with biosbits) without an +operating system getting involved in between. +There are several advantages to directly testing the bios in a real physical +machine or VM as opposed to indirectly discovering bios issues through the +operating system. For one thing, the OSes tend to hide bios problems from the +end user. The other is that we have more control of what we wanted to test +and how by directly using acpica interpreter on top of the bios on a running +system. More details on the inspiration for developing biosbits and its real +life uses can be found in [#a]_ and [#b]_. +This directory contains tests written in python using avocado framework that +exercises the QEMU bios components using biosbits and reports test failures. +For QEMU, we maintain a fork of bios bits in gitlab along with all the +dependent submodules: +https://gitlab.com/qemu-project/biosbits-bits +This fork contains numerous fixes, a newer acpica and changes specific to +running this avocado QEMU tests using bits. The author of this document +is the sole maintainer of the QEMU fork of bios bits repo. + +Under the directory ``tests/avocado/``, ``acpi-bits.py`` is a QEMU avocado +test that drives all this. + +A brief description of the various test files follows. + +Under ``tests/avocado/`` as the root we have: + +:: + + ├── acpi-bits + │ ├── bits-config + │ │ └── bits-cfg.txt + │ ├── bits-tests + │ │ ├── smbios.py2 + │ │ ├── testacpi.py2 + │ │ └── testcpuid.py2 + │ └── README + ├── acpi-bits.py + +* ``tests/avocado``: + + ``acpi-bits.py``: + This is the main python avocado test script that generates a + biosbits iso. It then spawns a QEMU VM with it, collects the log and reports + test failures. This is the script one would be interested in if they wanted + to add or change some component of the log parsing, add a new command line + to alter how QEMU is spawned etc. Test writers typically would not need to + modify this script unless they wanted to enhance or change the log parsing + for their tests. In order to enable debugging, you can set **V=1** + environment variable. This enables verbose mode for the test and also dumps + the entire log from bios bits and more information in case failure happens. + + In order to run this test, please perform the following steps from the QEMU + build directory: + :: + + $ make check-venv (needed only the first time to create the venv) + $ ./tests/venv/bin/avocado run -t acpi tests/avocado + + The above will run all acpi avocado tests including this one. + In order to run the individual tests, perform the following: + :: + + $ ./tests/venv/bin/avocado run tests/avocado/acpi-bits.py --tap - + + The above will produce output in tap format. You can omit "--tap -" in the + end and it will produce output like the following: + :: + + $ ./tests/venv/bin/avocado run tests/avocado/acpi-bits.py + Fetching asset from tests/avocado/acpi-bits.py:AcpiBitsTest.test_acpi_smbios_bits + JOB ID : eab225724da7b64c012c65705dc2fa14ab1defef + JOB LOG : /home/anisinha/avocado/job-results/job-2022-10-10T17.58-eab2257/job.log + (1/1) tests/avocado/acpi-bits.py:AcpiBitsTest.test_acpi_smbios_bits: PASS (33.09 s) + RESULTS : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0 + JOB TIME : 39.22 s + + You can inspect the log file for more information about the run or in order + to diagnoze issues. If you pass V=1 in the environment, more diagnostic logs + would be found in the test log. + +* ``tests/avocado/acpi-bits/bits-config``: + + This location contains biosbits configuration files that determine how the + software runs the tests. + + ``bits-config.txt``: + This is the biosbits config file that determines what tests + or actions are performed by bits. The description of the config options are + provided in the file itself. + +* ``tests/avocado/acpi-bits/bits-tests``: + + This directory contains biosbits python based tests that are run from within + the biosbits environment in the spawned VM. New additions of test cases can + be made in the appropriate test file. For example, new acpi tests can go + into testacpi.py2 and one would call testsuite.add_test() to register the new + test so that it gets executed as a part of the ACPI tests. + It might be occasionally necessary to disable some subtests or add a new + test that belongs to a test suite not already present in this directory. To + do this, please clone the bits source from + https://gitlab.com/qemu-project/biosbits-bits/-/tree/qemu-bits. + Note that this is the "qemu-bits" branch and not the "bits" branch of the + repository. "qemu-bits" is the branch where we have made all the QEMU + specific enhancements and we must use the source from this branch only. + Copy the test suite/script that needs modification (addition of new tests + or disabling them) from python directory into this directory. For + example, in order to change cpuid related tests, copy the following + file into this directory and rename it with .py2 extension: + https://gitlab.com/qemu-project/biosbits-bits/-/blob/qemu-bits/python/testcpuid.py + Then make your additions and changes here. Therefore, the steps are: + + (a) Copy unmodified test script to this directory from bits source. + (b) Add a SPDX license header. + (c) Perform modifications to the test. + + Commits (a), (b) and (c) should go under separate commits so that the original + test script and the changes we have made are separated and clear. + + The test framework will then use your modified test script to run the test. + No further changes would be needed. Please check the logs to make sure that + appropriate changes have taken effect. + + The tests have an extension .py2 in order to indicate that: + + (a) They are python2.7 based scripts and not python 3 scripts. + (b) They are run from within the bios bits VM and is not subjected to QEMU + build/test python script maintainance and dependency resolutions. + (c) They need not be loaded by avocado framework when running tests. + + +Author: Ani Sinha <ani@anisinha.ca> + +References: +----------- +.. [#a] https://blog.linuxplumbersconf.org/2011/ocw/system/presentations/867/original/bits.pdf +.. [#b] https://www.youtube.com/watch?v=36QIepyUuhg + diff --git a/docs/devel/index-build.rst b/docs/devel/index-build.rst index 1002a533a6..57e8d39d98 100644 --- a/docs/devel/index-build.rst +++ b/docs/devel/index-build.rst @@ -11,6 +11,7 @@ the basics if you are adding new files and targets to the build. build-system kconfig testing + acpi-bits qtest ci qapi-code-gen |