reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/4d356858e22b5daf59ef3f38b776ed0f63ca70e0
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest-hardening-rebased
        git checkout 4d356858e22b5daf59ef3f38b776ed0f63ca70e0
        # 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 prepare