reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/614408cfce8b25afb96c6051f29a0a978feae893
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-attest
        git checkout 614408cfce8b25afb96c6051f29a0a978feae893
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/coco/tdx/ drivers/virt/coco/tdx-guest/