reproduce (this is a W=1 build):
        # https://github.com/projectacrn/acrn-kernel/commit/67977912bebfec14bf4c0ced6c01df309725fc8d
        git remote add acrn https://github.com/projectacrn/acrn-kernel
        git fetch --no-tags acrn 6.17/linux
        git checkout 67977912bebfec14bf4c0ced6c01df309725fc8d

        # 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/events/intel/