The patch titled
Subject: selftests/mm: Update va_high_addr_switch.sh to check CPU for la57 flag
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
selftests-mm-update-va_high_addr_switchsh-to-check-cpu-for-la57-flag.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-update-va_high_addr_switchsh-to-check-cpu-for-la57-flag.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Audra Mitchell <audra@xxxxxxxxxx>
Subject: selftests/mm: Update va_high_addr_switch.sh to check CPU for la57 flag
Date: Fri, 19 Jan 2024 15:58:01 -0500
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.
Link: https://lkml.kernel.org/r/20240119205801.62769-1-audra@xxxxxxxxxx
Fixes: 4f2930c6718a ("selftests/vm: only run 128TBswitch with 5-level paging")
Signed-off-by: Audra Mitchell <audra@xxxxxxxxxx>
Cc: Rafael Aquini <raquini@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Adam Sindelar <adam@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/va_high_addr_switch.sh | 6 ++++++
1 file changed, 6 insertions(+)
--- a/tools/testing/selftests/mm/va_high_addr_switch.sh~selftests-mm-update-va_high_addr_switchsh-to-check-cpu-for-la57-flag
+++ a/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
fi
}
_
Patches currently in -mm which might be from audra@xxxxxxxxxx are
selftests-mm-update-va_high_addr_switchsh-to-check-cpu-for-la57-flag.patch
