From: Michael Chang <mchang@suse.com>
Subject: [PATCH] fix menu in xen host server

References: bnc#771689, bnc#757895
Patch-Mainline: no

When system is configred as "Xen Virtual Machines Host Server", the
grub2 menu is not well organized. We could see some issues on it.

 - Many duplicated xen entries generated by links to xen hypervisor
 - Non bootable kernel entries trying to boot xen kernel natively
 - The -dbg xen hypervisor takes precedence over release version

This patch fixes above three issues.

v2:
References: bnc#877040
Create only hypervisor pointed by /boot/xen.gz symlink to not clutter
the menu with multiple versions and also not include -dbg. Use custom.cfg
if you need any other custom entries.

v3:
References: bnc#865815
Porting to tboot in order to fix duplicated xen entries

Index: tboot-1.11.1/tboot/20_linux_tboot
===================================================================
--- tboot-1.11.1.orig/tboot/20_linux_tboot
+++ tboot-1.11.1/tboot/20_linux_tboot
@@ -219,6 +219,49 @@ while [ "x${tboot_list}" != "x" ] && [ "
 		break
 	    fi
 	done
+
+	config=
+	for i in "${dirname}/config-${version}" "${dirname}/config-${alt_version}" "/etc/kernels/kernel-config-${version}" ; do
+	    if test -e "${i}" ; then
+	    config="${i}"
+	    break
+	fi
+	done
+
+	# try to get the kernel config if $linux is a symlink
+	if test -z "${config}" ; then
+	    lnk_version=`basename \`readlink -f $linux\` | sed -e "s,^[^0-9]*-,,g"`
+	    if (test -n ${lnk_version} && test -e "${dirname}/config-${lnk_version}") ; then
+		config="${dirname}/config-${lnk_version}"
+	    fi
+	fi
+
+	# check if we are in xen domU
+	if [ ! -e /proc/xen/xsd_port -a -e /proc/xen ]; then
+	    # we're running on xen domU guest
+	    dmi=/sys/class/dmi/id
+	    if [ -r "${dmi}/product_name" -a -r "${dmi}/sys_vendor" ]; then
+		product_name=`cat ${dmi}/product_name`
+		sys_vendor=`cat ${dmi}/sys_vendor`
+		if test "${sys_vendor}" = "Xen" -a "${product_name}" = "HVM domU"; then
+		    # xen HVM guest
+		    xen_pv_domU=false
+		fi
+	    fi
+	else
+	    # we're running on baremetal or xen dom0
+	    xen_pv_domU=false
+	fi
+
+	if test "$xen_pv_domU" = "false" ; then
+	    # prevent xen kernel without pv_opt support from booting
+	    if (grep -qx "CONFIG_XEN=y" "${config}" 2> /dev/null && ! grep -qx "CONFIG_PARAVIRT=y" "${config}" 2> /dev/null); then
+		echo "Skip xenlinux kernel $linux" >&2
+		list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '`
+		continue
+	    fi
+	fi
+
 	if test -n "${initrd}" ; then
 	    echo "Found initrd image: ${dirname}/${initrd}" >&2
 	else
Index: tboot-1.11.1/tboot/20_linux_xen_tboot
===================================================================
--- tboot-1.11.1.orig/tboot/20_linux_xen_tboot
+++ tboot-1.11.1/tboot/20_linux_xen_tboot
@@ -58,6 +58,12 @@ fi
 export TEXTDOMAIN=grub
 export TEXTDOMAINDIR=${prefix}/share/locale
 
+if [ ! -e /proc/xen/xsd_port -a -e /proc/xen ]; then
+# we're running on xen domU guest
+# prevent setting up nested virt on HVM or PV domU guest
+    exit 0
+fi
+
 CLASS="--class gnu-linux --class gnu --class os --class xen"
 
 if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
@@ -191,9 +197,17 @@ linux_list=`for i in /boot/vmlinu[xz]-*
 if [ "x${linux_list}" = "x" ] ; then
     exit 0
 fi
-xen_list=`for i in /boot/xen*; do
-        if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
-      done`
+# bnc#877040 - Duplicate entries for boot menu created
+# only create /boot/xen.gz symlink boot entry
+if test -L /boot/xen.gz; then
+    xen_list=`readlink -f /boot/xen.gz`
+else
+    # bnc#757895 - Grub2 menu items incorrect when "Xen Virtual Machines Host Server" selected
+    # wildcard expasion with correct suffix (.gz) for not generating many duplicated menu entries
+    xen_list=`for i in /boot/xen*.gz; do
+         if grub_file_is_not_garbage "$i" && file_is_not_sym "$i" ; then echo -n "$i " ; fi
+         done`
+fi
 tboot_list=`for i in /boot/tboot*.gz; do
         if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
       done`