reproduce (this is a W=1 build):
        git remote add xen-tip https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git
        git fetch xen-tip linux-next
        git checkout xen-tip/linux-next
        b4 shazam https://lore.kernel.org/r/alpine.DEB.2.22.394.2501031501420.16425@ubuntu-linux-20-04-desktop
        # 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 drivers/platform/x86/ drivers/xen/