SMT: Apply settings according to configuration

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

diff --git a/src/initscripts/system/smt b/src/initscripts/system/smt
new file mode 100644 (file)
index 0000000..a31cd7b
--- /dev/null
+++ b/src/initscripts/system/smt
@@ -0,0 +1,40 @@
+#!/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