1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0-only */
3#
4# Wrapper script which performs setup and cleanup for nx_huge_pages_test.
5# Makes use of root privileges to set up huge pages and KVM module parameters.
6#
7# Copyright (C) 2022, Google LLC.
8
9set -e
10
11NX_HUGE_PAGES=$(cat /sys/module/kvm/parameters/nx_huge_pages)
12NX_HUGE_PAGES_RECOVERY_RATIO=$(cat /sys/module/kvm/parameters/nx_huge_pages_recovery_ratio)
13NX_HUGE_PAGES_RECOVERY_PERIOD=$(cat /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms)
14HUGE_PAGES=$(cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages)
15
16set +e
17
18function sudo_echo () {
19	echo "$1" | sudo tee -a "$2" > /dev/null
20}
21
22NXECUTABLE="$(dirname $0)/nx_huge_pages_test"
23
24sudo_echo test /dev/null || exit 4 # KSFT_SKIP=4
25
26(
27	set -e
28
29	sudo_echo 1 /sys/module/kvm/parameters/nx_huge_pages
30	sudo_echo 1 /sys/module/kvm/parameters/nx_huge_pages_recovery_ratio
31	sudo_echo 100 /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms
32	sudo_echo "$(( $HUGE_PAGES + 3 ))" /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
33
34	# Test with reboot permissions
35	if [ $(whoami) == "root" ] || sudo setcap cap_sys_boot+ep $NXECUTABLE 2> /dev/null; then
36		echo Running test with CAP_SYS_BOOT enabled
37		$NXECUTABLE -t 887563923 -p 100 -r
38		test $(whoami) == "root" || sudo setcap cap_sys_boot-ep $NXECUTABLE
39	else
40		echo setcap failed, skipping nx_huge_pages_test with CAP_SYS_BOOT enabled
41	fi
42
43	# Test without reboot permissions
44	if [ $(whoami) != "root" ] ; then
45		echo Running test with CAP_SYS_BOOT disabled
46		$NXECUTABLE -t 887563923 -p 100
47	else
48		echo Running as root, skipping nx_huge_pages_test with CAP_SYS_BOOT disabled
49	fi
50)
51RET=$?
52
53sudo_echo "$NX_HUGE_PAGES" /sys/module/kvm/parameters/nx_huge_pages
54sudo_echo "$NX_HUGE_PAGES_RECOVERY_RATIO" /sys/module/kvm/parameters/nx_huge_pages_recovery_ratio
55sudo_echo "$NX_HUGE_PAGES_RECOVERY_PERIOD" /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms
56sudo_echo "$HUGE_PAGES" /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
57
58exit $RET
59