reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/intel/tdx/commit/6d4ad81993ed6f40f1f82c07cfe9fedf4b4d4722
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-tpm
        git checkout 6d4ad81993ed6f40f1f82c07cfe9fedf4b4d4722
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ arch/x86/kvm/ drivers/char/tpm/ drivers/dma/idxd/ drivers/iommu/iommufd/ drivers/misc/ drivers/platform/x86/intel/ drivers/vfio/pci/