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Welcome to acrn-unit-test

acrn-unit-test is to provide unit tests for acrn-hypervisor. The unit tests are tiny guest operating systems that generally execute only tens of lines of C and assembler test code in order to obtain its PASS/FAIL result. Unit tests provide ACRN and virtual hardware functional testing by targeting the features through minimal implementations of their use per the hardware specification. The simplicity of unit tests make them easy to verify they are correct, easy to maintain, and easy to use in timing measurements.

acrn-unit-test inherits from kvm-unit-tests and will keep kvm-unit-tests Framework and API. For the more information, please refer to: http://www.linux-kvm.org/page/KVM-unit-tests.

Building the test

git clone https://github.com/projectacrn/acrn-unit-test.git
cd acrn-unit-test

x86 directory contains the test suite for ACRN.

To create all test images do:

./configure --arch=x86_64
make

Test images are created in x86/*.flat

or to create one specified test image do

./configure --arch=x86_64
make x86/hello_acrn.flat

Test image is created in x86/hello_acrn.flat

Running the test

Creating ACRN User VM launch script

You can setup ACRN test environment according to the ACRN Introduction and Getting Started Guide.

For acrn-unit-test, it uses COM1 to print all logs and supports only 2 CPU cores. So you need free COM1 and set 2 vCPU for User VM while you create ACRN scenario.xml.

<console_vuart>COM Port 1</console_vuart> => <console_vuart></console_vuart>

<cpu_affinity>
 <pcpu>
   <pcpu_id>0</pcpu_id>
 </pcpu>
 <pcpu>
   <pcpu_id>1</pcpu_id>
 </pcpu>
</cpu_affinity>

When you get User VM launch script, such as launch_user_vm_id1.sh, you need update it in order to run acrn-unit-test.

To limit vCPU number == 2:

`add_cpus   0 2`

to enable COM1 to print logs:

-s 1:0,lpc -l com1,stdio

to add --debugexit -E $1 as acrn-dm parameter:

acrn-dm --debugexit -E $1 ${dm_params[*]}

and to disable OVMF and virtio-blk at last:

#    --ovmf /usr/share/acrn/bios/OVMF.fd
#    `add_virtual_device    4 virtio-blk ./win10-ltsc.img`

Running the test with the updated launch script

./launch_user_vm_id1.sh x86/hello_acrn.flat

Adding a test

Create the new unit test's main code file

cat > x86/new-unit-test.c

#include <libcflat.h>
int main(void)
{
   report(true, "hello!");
   return report_summary();
}

Ensure the appropriate makefile, e.g. x86/Makefile.common, has been updated by adding it to a tests variable

tests-common += $(TEST_DIR)/new-unit-test.flat

Note

the tests-common variable identifies tests shared between similar architectures, e.g. i386 and x86_64. Use the tests makefile variable of a specific architecture's makefile to build the test specifically for that architecture.

You can now build and run the test

./configure --arch=x86_64
make
./launch_user_vm_id1.sh x86/new-unit-test.flat

Contributing

Directory structure

.:                  configure script, top-level Makefile
./scripts:          general architecture neutral helper scripts for building and running tests
./lib:              general architecture neutral services for the tests
./lib/x86:          architecture dependent services for the tests
./x86:              the sources of the tests and the created objects/images

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, see Linux kernel doc Documentation/process/coding-style.rst
  • Shell: use TABs for indentation

Exceptions:

  • While the kernel standard requires 80 columns, we allow up to 120.

Header guards:

Please try to adhere to the following patterns when adding "#ifndef <...> #define <...>" header guards:

./lib:             _HEADER_H_
./lib/<ARCH>:      _ARCH_HEADER_H_
./lib/<ARCH>/asm:  _ASMARCH_HEADER_H_
./<ARCH>:          ARCH_HEADER_H

Patches

Patches are welcome at the ACRN mailing list <[email protected]>.

Please prefix messages with: [acrn-unit-test PATCH]

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

[format]
subjectprefix = acrn-unit-test PATCH

We strive to follow the Linux kernels coding style so it's recommended to run the kernel's ./scripts/checkpatch.pl on new patches.

You also can find the more information about how to contribute to ACRN in this Contribution Guide document: