# KVM Unit Test Driver

This directory contains the driver script for kvm-unit-tests. Tests run
inside QEMU that emulates the native architecture.

## Requirements:

- A Linux kernel image cross-compiled for AArch64. See ANDROID-KVM_DIR/linux

Build using default rules:
  $ make linux

Example of custom building:
  $ cd ANDROID-KVM_DIR/linux
  $ make ARCH=arm64 CROSS_COMPILE="aarch64-linux-gnu-" -j`nproc` defconfig
  $ make ARCH=arm64 CROSS_COMPILE="aarch64-linux-gnu-" -j`nproc`
  $ # image is now in ANDROID-KVM_DIR/linux/arch/arm64/boot/Image.gz


- KVM unit tests built as standalone. See ANDROID-KVM_DIR/kvm-unit-tests

Build using default rules:
  $ make kvm-unit-tests

Example of custom building:
  $ cd ANDROID-KVM_DIR/kvm-unit-tests
  $ ./configure --arch=arm64 --cross-prefix="aarch64-linux-gnu-"
  $ make -j`nproc` standalone
  $ # test binaries are now in ANDROID-KVM_DIR/kvm-unit-tests/tests


- A root file system image to boot.

A prebuilt image is in ANDROID-KVM_DIR/prebuilts.

Rebuild using default rules:
  $ make update-prebuilts

Example of custom building:
  $ cd ANDROID-KVM_DIR/buildroot
  $ make qemu_aarch64_virt_kvmunittests_defconfig
  $ make clean all
  $ # image is now in ANDROID-KVM_DIR/buildroot/output/images/rootfs.ext4


- QEMU with aarch64-softmmu, v5.0.0 or later

A prebuilt binary is in ANDROID-KVM_DIR/prebuilts.

Buildroot creates one in the buildprocess. It's available at
ANDROID-KVM_DIR/buildroot/output/host/bin/qemu-system-aarch64

## Running the tests

To run all tests:
  $ make test -j`nproc`

To list all test targets:
  $ make test-list

To run one test, e.g. PSCI under nVHE:
  $ make test-kut-nvhe-psci

To run the same test with GDB server:
  $ make test-kut-nvhe-psci-gdb

Alternatively, a test can be invoked using run_test.sh:
  $ ./build/kvm-unit-tests/run_test.sh psci
Note that this will not rebuild dependencies but starts quicker.