name : va_high_addr_switch.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io> # # This is a test for mmap behavior with 5-level paging. This script wraps the # real test to check that the kernel is configured to support at least 5 # pagetable levels. # 1 means the test failed exitcode=1 # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 fail() { echo "$1" exit $exitcode } check_supported_x86_64() { local config="/proc/config.gz" [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" [[ -f "${config}" ]] || fail "Cannot find kernel config in /proc or /boot" # gzip -dcfq automatically handles both compressed and plaintext input. # See man 1 gzip under '-f'. local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;} else {print 1}; exit}' /proc/cpuinfo 2>/dev/null) if [[ "${pg_table_levels}" -lt 5 ]]; then echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" exit $ksft_skip elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then echo "$0: CPU does not have the necessary la57 flag to support page table level 5" exit $ksft_skip fi } check_test_requirements() { # The test supports x86_64 and powerpc64. We currently have no useful # eligibility check for powerpc64, and the test itself will reject other # architectures. case `uname -m` in "x86_64") check_supported_x86_64 ;; *) return 0 ;; esac } check_test_requirements ./va_high_addr_switch # In order to run hugetlb testcases, "--run-hugetlb" must be appended # to the binary. ./va_high_addr_switch --run-hugetlb