This patch adds PPC64 Radix MMU support to the va_high_addr_switch.sh by introducing check_supported_ppc64(). The function verifies:

- 5-level paging (PGTABLE_LEVELS >= 5) enable in kernel config - Radix MMU (required for PPC64 5-level translation) - HugePages availability (needed for some tests)

If any check fails, the test is skipped (ksft_skip). This ensures compatibility with Power9/Power10 systems running in Radix MMU mode.

Avoid failures on 4-level paging system:

# mmap(NULL, MAP_HUGETLB): 0xffffffffffffffff - FAILED # mmap(LOW_ADDR, MAP_HUGETLB): 0xffffffffffffffff - FAILED # mmap(HIGH_ADDR, MAP_HUGETLB): 0xffffffffffffffff - FAILED # mmap(HIGH_ADDR, MAP_HUGETLB) again: 0xffffffffffffffff - FAILED # mmap(HIGH_ADDR, MAP_FIXED | MAP_HUGETLB): 0xffffffffffffffff - FAILED # mmap(-1, MAP_HUGETLB): 0xffffffffffffffff - FAILED # mmap(-1, MAP_HUGETLB) again: 0xffffffffffffffff - FAILED # mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2*HUGETLB_SIZE, MAP_HUGETLB): 0xffffffffffffffff - FAILED # mmap(ADDR_SWITCH_HINT , 2*HUGETLB_SIZE, MAP_FIXED | MAP_HUGETLB): 0xffffffffffffffff - FAILED

Signed-off-by: Li Wang liwang@redhat.com --- .../selftests/mm/va_high_addr_switch.sh | 28 +++++++++++++++++++ 1 file changed, 28 insertions(+)

diff --git a/tools/testing/selftests/mm/va_high_addr_switch.sh b/tools/testing/selftests/mm/va_high_addr_switch.sh index 2c725773cd79..1f92e8caceac 100755 --- a/tools/testing/selftests/mm/va_high_addr_switch.sh +++ b/tools/testing/selftests/mm/va_high_addr_switch.sh @@ -41,6 +41,31 @@ check_supported_x86_64() fi }

+check_supported_ppc64() +{ + local config="/proc/config.gz" + [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" + [[ -f "${config}" ]] || fail "Cannot find kernel config in /proc or /boot" + + local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) + if [[ "${pg_table_levels}" -lt 5 ]]; then + echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" + exit $ksft_skip + fi + + local mmu_support=$(grep -m1 "mmu" /proc/cpuinfo | awk '{print $3}') + if [[ "$mmu_support" != "radix" ]]; then + echo "$0: System does not use Radix MMU, required for 5-level paging" + exit $ksft_skip + fi + + local hugepages_total=$(awk '/HugePages_Total/ {print $2}' /proc/meminfo) + if [[ "${hugepages_total}" -eq 0 ]]; then + echo "$0: HugePages are not enabled, required for some tests" + exit $ksft_skip + fi +} + check_test_requirements() { # The test supports x86_64 and powerpc64. We currently have no useful @@ -50,6 +75,9 @@ check_test_requirements() "x86_64") check_supported_x86_64 ;; + "ppc64le"|"ppc64") + check_supported_ppc64 + ;; *) return 0 ;;