reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/2203fdee94ff07f81261eb34978778fdb953e15c
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-attest
        git checkout 2203fdee94ff07f81261eb34978778fdb953e15c
        # 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 drivers/virt/coco/tdx-guest/