reproduce (this is a W=1 build):
        # https://github.com/sean-jc/linux/commit/20b9ec6b4aa8ea9097c009c0d750df16f382f82a
        git remote add sean-jc https://github.com/sean-jc/linux
        git fetch --no-tags sean-jc x86/vmcs12_pages_leak
        git checkout 20b9ec6b4aa8ea9097c009c0d750df16f382f82a

        # 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