• nasm: Small unit tests written in assembly, which are run using gdb on the host.
• qemu: Builds a Linux binary, which tests many CPU features, which are then compared to a run on the host.
• kvm-unit-test: Based on tests from the KVM project, tests various CPU features.
• full: Starts several OSes and checks if they boot correctly.
• perf-irhydra: Manual performance test. Probably not interesting for you.