reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/LuBaolu/intel-iommu/commit/8110a9ab91e8ab6e53f89d00ce42fe302e972a1c
        git remote add lubaolu-intel-iommu https://github.com/LuBaolu/intel-iommu.git
        git fetch --no-tags lubaolu-intel-iommu iommufd-io-pgfault-delivery-v7
        git checkout 8110a9ab91e8ab6e53f89d00ce42fe302e972a1c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/iommu/iommufd/ lib/zstd/