reproduce (this is a W=1 build):
        git checkout 66672af7a095d89f082c5327f3b15bc2f93d558e
        b4 shazam https://lore.kernel.org/r/20260415-xen-swiotlb-v1-1-de24eda3c0fd@nxp.com

        # 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/xen/