# Build kvm-unit-tests and run under UEFI ## Introduction This dir provides code to build kvm-unit-tests test cases and run them under QEMU and UEFI. ### Install dependencies The following dependencies should be installed: - [UEFI firmware](https://github.com/tianocore/edk2): to run test cases in QEMU ### Build To build: ./configure --enable-efi make ### Run test cases with UEFI To run a test case with UEFI: ./x86/efi/run ./x86/msr.efi By default the runner script loads the UEFI firmware `/usr/share/ovmf/OVMF.fd`; please install UEFI firmware to this path, or specify the correct path through the env variable `EFI_UEFI`: EFI_UEFI=/path/to/OVMF.fd ./x86/efi/run ./x86/msr.efi ## Code structure ### Code from GNU-EFI This dir contains source code and linker script copied from [GNU-EFI](https://sourceforge.net/projects/gnu-efi/): - crt0-efi-x86_64.S: startup code of an EFI application - elf_x86_64_efi.lds: linker script to build an EFI application - reloc_x86_64.c: position independent x86_64 ELF shared object relocator EFI application binaries should be relocatable as UEFI loads binaries to dynamic runtime addresses. To build such relocatable binaries, GNU-EFI utilizes the above-mentioned files in its build process: 1. build an ELF shared object and link it using linker script `elf_x86_64_efi.lds` to organize the sections in a way UEFI recognizes 2. link the shared object with self-relocator `reloc_x86_64.c` that applies dynamic relocations that may be present in the shared object 3. link the entry point code `crt0-efi-x86_64.S` that invokes self-relocator and then jumps to EFI application's `efi_main()` function 4. convert the shared object to an EFI binary More details can be found in `GNU-EFI/README.gnuefi`, section "Building Relocatable Binaries". kvm-unit-tests follows a similar build process, but does not link with GNU-EFI library. ### Startup code for kvm-unit-tests in UEFI This dir also contains kvm-unit-tests startup code in UEFI: - efistart64.S: startup code for kvm-unit-tests in UEFI