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# Welcome to kvm-unit-tests

See http://www.linux-kvm.org/page/KVM-unit-tests for a high-level
description of this project, as well as running tests and adding
tests HOWTOs.

# Building the tests

This directory contains sources for a kvm test suite.

To create the test images do:

    ./configure
    make

in this directory. Test images are created in ./<ARCH>/*.flat

## Standalone tests

The tests can be built as standalone
To create and use standalone tests do:

    ./configure
    make standalone
    (send tests/some-test somewhere)
    (go to somewhere)
    ./some-test

'make install' will install all tests in PREFIX/share/kvm-unit-tests/tests,
each as a standalone test.


# Running the tests

Then use the runner script to detect the correct invocation and
invoke the test:

    ./x86-run ./x86/msr.flat
or:

    ./run_tests.sh

to run them all.

To select a specific qemu binary, specify the QEMU=<path>
environment variable:

    QEMU=/tmp/qemu/x86_64-softmmu/qemu-system-x86_64 ./x86-run ./x86/msr.flat

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# Unit test inputs

Unit tests use QEMU's '-append <args...>' parameter for command line
inputs, i.e. all args will be available as argv strings in main().
Additionally a file of the form

KEY=VAL
KEY2=VAL
...

may be passed with '-initrd <file>' to become the unit test's environ,
which can then be accessed in the usual ways, e.g. VAL = getenv("KEY")
Any key=val strings can be passed, but some have reserved meanings in
the framework. The list of reserved environment variables is below

 QEMU_ACCEL            ... either kvm or tcg
 QEMU_VERSION_STRING   ... string of the form `qemu -h | head -1`
 KERNEL_VERSION_STRING ... string of the form `uname -r`

Additionally these self-explanatory variables are reserved

 QEMU_MAJOR, QEMU_MINOR, QEMU_MICRO, KERNEL_VERSION, KERNEL_PATCHLEVEL,
 KERNEL_SUBLEVEL, KERNEL_EXTRAVERSION

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# Contributing

## Directory structure

    .:				configure script, top-level Makefile, and run_tests.sh
    ./scripts:		helper scripts for building and running tests
    ./lib:			general architecture neutral services for the tests
    ./lib/<ARCH>:	architecture dependent services for the tests
    ./<ARCH>:		the sources of the tests and the created objects/images

See <ARCH>/README for architecture specific documentation.

## Style

Currently there is a mix of indentation styles so any changes to
existing files should be consistent with the existing style. For new
files:

  - C: please use standard linux-with-tabs
  - Shell: use TABs for indentation

## Patches

Patches are welcome at the KVM mailing list <kvm@vger.kernel.org>.

Please prefix messages with: [kvm-unit-tests PATCH]

You can add the following to .git/config to do this automatically for you:

    [format]
        subjectprefix = kvm-unit-tests PATCH

Andrew Jones's avatar
Andrew Jones committed
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Additionally it's helpful to have a common order of file types in patches.
Our chosen order attempts to place the more declarative files before
the code files. We also start with common code and finish with unit test
code. git-diff's orderFile feature allows us to specify the order in a
file. The orderFile we use is `scripts/git.difforder`. Adding the config
with `git config diff.orderFile scripts/git.difforder` enables it.