reproduce (this is a W=1 build):
        # https://github.com/intel/tdx/commit/9cf78ea6bd2d11c2f86e94a416ddcf6797a60602
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx tdx_kvm_dev-2024-08-01-rebase
        git checkout 9cf78ea6bd2d11c2f86e94a416ddcf6797a60602
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kvm/