SMT: Apply settings according to configuration

[ipfire-2.x.git] / src / initscripts / system / smt

#!/bin/sh
########################################################################
# Begin $rc_base/init.d/smt
########################################################################

. /etc/sysconfig/rc
. ${rc_functions}

eval $(/usr/local/bin/readhash /var/ipfire/main/security)

case "${1}" in
	start)
		# Nothing to do here when SMT is forced on
		if [ "${ENABLE_SMT}" = "on" ]; then
			exit 0
		fi

		# Nothing to do if this processor is not vulnerable
		# to Fallout/RIDL.
		if [ -r "/sys/devices/system/cpu/vulnerabilities/mds" ]; then
			if [ "$(</sys/devices/system/cpu/vulnerabilities/mds)" = "Not affected" ]; then
				exit 0
			fi

			# Disable SMT when supported and enabled
			if [ "$(</sys/devices/system/cpu/smt/control)" = "on" ]; then
				boot_mesg "Disabling Simultaneous Multi-Threading (SMT)..."
				echo "forceoff" > /sys/devices/system/cpu/smt/control
				echo_ok
			fi
		fi
		;;

	*)
		echo "Usage: ${0} {start}"
		exit 1
		;;
esac

# End $rc_base/init.d/smt