On Fri, 19 Jan 2024 15:58:01 -0500 Audra Mitchell audra@redhat.com wrote:
In order for the page table level 5 to be in use, the CPU must have the setting enabled in addition to the CONFIG option. Check for the flag to be set to avoid false test failures on systems that do not have this cpu flag set.
Thanks.
I'll add
Cc: Adam Sindelar adam@wowsignal.io Fixes: 4f2930c6718a ("selftests/vm: only run 128TBswitch with 5-level paging") Cc: stable@vger.kernel.org
A more complete description of these "test failures" would be helpful please.
--- a/tools/testing/selftests/mm/va_high_addr_switch.sh +++ b/tools/testing/selftests/mm/va_high_addr_switch.sh @@ -29,9 +29,15 @@ check_supported_x86_64() # 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} -- 2.43.0