start/stop rt-entsk daemon on initialization/shutdown

The rt-entsk application, part of newer rt-setup packages,
worksaround a latency issue with static key
IPI's. What it does it:

/*
 * Open a socket, and enable timestamping on it.
 *
 * This is to avoid Chrony from changing timestamping
 * user count from 0->1 and vice-versa, causing
 * static key enable/disable IPIs.
 *
 */

Start/stop the systemctl service from the realtime-virtual-host
and realtime-virtual-guest profiles.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

profiles/realtime-virtual-guest/script.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+. /usr/lib/tuned/functions
+
+start() {
+    systemctl start rt-entsk
+    return "$?"
+}
+
+stop() {
+    systemctl stop rt-entsk
+    return "$?"
+}
+
+verify() {
+    return "$?"
+}
+
+process $@

profiles/realtime-virtual-host/script.sh

@@ -98,6 +98,7 @@ start() {
     if [ -f $CACHE_VALUE_FILE ]; then
         echo `cat $CACHE_VALUE_FILE` > $KVM_LAPIC_FILE
     fi
+    systemctl start rt-entsk
 
     return 0
 }
@@ -105,6 +106,7 @@ start() {
 stop() {
     [ "$1" = "full_rollback" ] && teardown_kvm_mod_low_latency
     enable_ksm
+    systemctl stop rt-entsk
     return "$?"
 }