1 files changed, 69 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86/nx_huge_pages_test.sh b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.sh
new file mode 100755
index 000000000000..caad084b8bfd
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86/nx_huge_pages_test.sh
@@ -0,0 +1,69 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only */
+#
+# Wrapper script which performs setup and cleanup for nx_huge_pages_test.
+# Makes use of root privileges to set up huge pages and KVM module parameters.
+#
+# Copyright (C) 2022, Google LLC.
+
+set -e
+
+NX_HUGE_PAGES=$(cat /sys/module/kvm/parameters/nx_huge_pages)
+NX_HUGE_PAGES_RECOVERY_RATIO=$(cat /sys/module/kvm/parameters/nx_huge_pages_recovery_ratio)
+NX_HUGE_PAGES_RECOVERY_PERIOD=$(cat /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms)
+HUGE_PAGES=$(cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages)
+
+# If we're already root, the host might not have sudo.
+if [ $(whoami) == "root" ]; then
+	function do_sudo () {
+		"$@"
+	}
+else
+	function do_sudo () {
+		sudo "$@"
+	}
+fi
+
+set +e
+
+function sudo_echo () {
+	echo "$1" | do_sudo tee -a "$2" > /dev/null
+}
+
+NXECUTABLE="$(dirname $0)/nx_huge_pages_test"
+
+sudo_echo test /dev/null || exit 4 # KSFT_SKIP=4
+
+(
+	set -e
+
+	sudo_echo 1 /sys/module/kvm/parameters/nx_huge_pages
+	sudo_echo 1 /sys/module/kvm/parameters/nx_huge_pages_recovery_ratio
+	sudo_echo 100 /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms
+	sudo_echo "$(( $HUGE_PAGES + 3 ))" /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
+
+	# Test with reboot permissions
+	if [ $(whoami) == "root" ] || sudo setcap cap_sys_boot+ep $NXECUTABLE 2> /dev/null; then
+		echo Running test with CAP_SYS_BOOT enabled
+		$NXECUTABLE -t 887563923 -p 100 -r
+		test $(whoami) == "root" || sudo setcap cap_sys_boot-ep $NXECUTABLE
+	else
+		echo setcap failed, skipping nx_huge_pages_test with CAP_SYS_BOOT enabled
+	fi
+
+	# Test without reboot permissions
+	if [ $(whoami) != "root" ] ; then
+		echo Running test with CAP_SYS_BOOT disabled
+		$NXECUTABLE -t 887563923 -p 100
+	else
+		echo Running as root, skipping nx_huge_pages_test with CAP_SYS_BOOT disabled
+	fi
+)
+RET=$?
+
+sudo_echo "$NX_HUGE_PAGES" /sys/module/kvm/parameters/nx_huge_pages
+sudo_echo "$NX_HUGE_PAGES_RECOVERY_RATIO" /sys/module/kvm/parameters/nx_huge_pages_recovery_ratio
+sudo_echo "$NX_HUGE_PAGES_RECOVERY_PERIOD" /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms
+sudo_echo "$HUGE_PAGES" /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
+
+exit $RET