reproduce:
        # https://github.com/ls-zhu/linux/commit/3bff324aa8c4e339af49c49aceda04369042ce61
        git remote add ls-zhu https://github.com/ls-zhu/linux
        git fetch --no-tags ls-zhu v6.7-rc6-tdx
        git checkout 3bff324aa8c4e339af49c49aceda04369042ce61
        make W=1 O=/tmp/kselftest headers
        make W=1 O=/tmp/kselftest -C tools/testing/selftests
        make W=1 O=/tmp/kselftest -C tools/testing/selftests/bpf