arm-autonomy, xenguest: Fail if Dom0 is not properly initialized

During the xenguest initialization and when invoking the
xenguest-manager tool, abort the execution if Dom0 was not properly
initialized on top of Xen and with the proper kernel configurations.

Change-Id: I307c03e58a266a943968df1bc5ba39951912d2cb
Issue-Id: SCM-996
Signed-off-by: Diego Sueiro <diego.sueiro@arm.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-autonomy/recipes-extended/xenguest/files/xenguest-init

@@ -12,6 +12,9 @@ fi
 
 source ${XENGUEST_CONF_BASE}/xenguest-manager.conf
 
+# Make sure we properly initialized the Dom0
+/usr/bin/xenguest-manager check-xen || exit $?
+
 # Create guest list
 guestlist=$(/usr/bin/xenguest-manager list)
 

meta-arm-autonomy/recipes-extended/xenguest/files/xenguest-manager

@@ -566,6 +566,24 @@ case ${cmd} in
         usage
         exit 0
         ;;
+
+esac
+
+# Check if we have a valid Dom0 booted with Xen
+ERROR_MSG=$(xl info 2>&1)
+if [ $? -ne 0 ]; then
+    echo "ERROR: Xen environment is not valid!!!" | tee -a ${LOGFILE}
+    echo "ERROR: Check if Xen has booted and the kernel configuration." \
+        | tee -a ${LOGFILE}
+    echo "ERROR: Output from 'xl info' command:" | tee -a ${LOGFILE}
+    echo "$ERROR_MSG" | tee -a ${LOGFILE}
+    exit 1
+fi
+
+case ${cmd} in
+    check-xen)
+        exit 0
+        ;;
     create)
         guestfile="${arg1}"
         guestname="${arg2}"