summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/vm/va_128TBswitch.sh
diff options
context:
space:
mode:
Diffstat (limited to 'tools/testing/selftests/vm/va_128TBswitch.sh')
-rwxr-xr-xtools/testing/selftests/vm/va_128TBswitch.sh54
1 files changed, 54 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/va_128TBswitch.sh b/tools/testing/selftests/vm/va_128TBswitch.sh
new file mode 100755
index 000000000..41580751d
--- /dev/null
+++ b/tools/testing/selftests/vm/va_128TBswitch.sh
@@ -0,0 +1,54 @@
+#!/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)
+
+ 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
+}
+
+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_128TBswitch