Initialize a package to build the GRUB for the Xen platform

Since the time pvgrub2 was adopted by the GRUB [1], the AUR has not had
a package that built GRUB2 for the Xen platform. I thought about
contributing a patch to the `grub-git` AUR package, but since it would
double their build targets (and compile time) for a purpose that was
probably not important or useful for most of the users of that package
(and since this also seemed like too much for this package to take on as
well), I thought it might be better to fork their project and create a
new package that would address all the GRUB-ish needs of Xen.

The intent is that this would follow `grub-git`, rebasing it on that
package as needed. Also some of these patches might be useful upstream,
either for the `grub-git` AUR package or for the GRUB project itself.

[1]: https://lists.xen.org/archives/html/xen-devel/2013-11/msg01216.html

10 files changed, 246 insertions, 15 deletions

diff --git a/.SRCINFO b/.SRCINFO
index 0fe651eb6860..9f3047b4165a 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -1,9 +1,9 @@
-pkgbase = grub-git
-	pkgdesc = GNU GRand Unified Bootloader (2)
-	pkgver = 2.04.rc1.r19.g4e7b5bb3b
+pkgbase = grub-xen-git
+	pkgdesc = GNU GRand Unified Bootloader (2) with Xen platform support
+	pkgver = 2.04.r141.ge7b8856f8
 	pkgrel = 1
 	url = https://www.gnu.org/software/grub/
-	install = grub-git.install
+	install = grub-xen-git.install
 	arch = x86_64
 	arch = i686
 	license = GPL3
@@ -29,20 +29,33 @@ pkgbase = grub-git
 	optdepends = libusb: For grub-emu USB support
 	provides = grub
 	conflicts = grub
+	conflicts = grub-git
 	backup = etc/default/grub
 	backup = etc/grub.d/40_custom
 	source = grub::git+https://git.savannah.gnu.org/git/grub.git
 	source = grub-extras::git+https://git.savannah.gnu.org/git/grub-extras.git
 	source = gnulib::git+https://git.savannah.gnu.org/git/gnulib.git
 	source = 10_linux-detect-archlinux-initramfs.patch
+	source = 20_linux_xen-detect-archlinux-initramfs.patch
+	source = 20_linux_xen-detect-x86-xen-dom0-linux-list.patch
+	source = 20_linux_xen-load-ucode-as-separate-multiboot-module.patch
+	source = 20_linux_xen-remove-grub-submenu-for-multiple-xen-versions.patch
+	source = 20_linux_xen-select-gzipped-xen-only.patch
+	source = 20_linux_xen-support-xen-realmode-with-grub-efi-boot.patch
 	source = add-GRUB_COLOR_variables.patch
 	source = grub.default
 	sha256sums = SKIP
 	sha256sums = SKIP
 	sha256sums = SKIP
 	sha256sums = 171415ab075d1ac806f36c454feeb060f870416f24279b70104bba94bd6076d4
+	sha256sums = aa2f81e74c9eb09bfd0eced093ec0f38409b0001bd20e2cad9e2d9275c8e73c4
+	sha256sums = 432ec7cda9d1a0c8e203d4cfd8ce8f046b967d2330a172ccbedca5345e5e7d08
+	sha256sums = 0ac60de9cca4000825c34f601e1a135e01bda85af6e4bcd75751967c0cc5c00d
+	sha256sums = aa1edfce6193146def470ae61129af3cbdc20638419a37e7e72f543281cb9d53
+	sha256sums = 7cec8e548a8cc6bd7dd26e7b81c1e43bfe270e89bff05382683ddbeeccf218bc
+	sha256sums = f0ccc146a3af7ecc14f5b1adbb0e0e5d03953839b336541741ba16737593e6ef
 	sha256sums = a5198267ceb04dceb6d2ea7800281a42b3f91fd02da55d2cc9ea20d47273ca29
-	sha256sums = 690adb7943ee9fedff578a9d482233925ca3ad3e5a50fffddd27cf33300a89e3
+	sha256sums = bd464f665372ee5211fe825153f31d3d499589cb3e7e25070340ddc0602727c1
 
-pkgname = grub-git
+pkgname = grub-xen-git
 
diff --git a/20_linux_xen-detect-archlinux-initramfs.patch b/20_linux_xen-detect-archlinux-initramfs.patch
new file mode 100644
index 000000000000..93c0f54adf1f
--- /dev/null
+++ b/20_linux_xen-detect-archlinux-initramfs.patch
@@ -0,0 +1,41 @@
+diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
+index 3b1f47049..7f1c8526a 100644
+--- a/util/grub.d/20_linux_xen.in
++++ b/util/grub.d/20_linux_xen.in
+@@ -118,6 +118,8 @@ linux_entry_xsm ()
+   if [ x$type != xsimple ] ; then
+       if [ x$type = xrecovery ] ; then
+ 	  title="$(gettext_printf "%s, with Xen %s and Linux %s (recovery mode)" "${os}" "${xen_version}" "${version}")"
++      elif [ x$type = xfallback ] ; then
++	  title="$(gettext_printf "%s, with Xen %s and Linux %s (fallback initramfs)" "${os}" "${xen_version}" "${version}")"
+       else
+ 	  title="$(gettext_printf "%s, with Xen %s and Linux %s" "${os}" "${xen_version}" "${version}")"
+       fi
+@@ -275,7 +277,7 @@ while [ "x${xen_list}" != "x" ] ; do
+ 	basename=`basename $linux`
+ 	dirname=`dirname $linux`
+ 	rel_dirname=`make_system_path_relative_to_its_root $dirname`
+-	version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`
++	version=`echo $basename | sed -e "s,vmlinuz-,,g"`
+ 	alt_version=`echo $version | sed -e "s,\.old$,,g"`
+ 	linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
+ 
+@@ -341,6 +343,18 @@ while [ "x${xen_list}" != "x" ] ; do
+ 
+ 	linux_entry "${OS}" "${version}" "${xen_version}" advanced \
+ 	    "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
++
++        if test -e "${dirname}/initramfs-${version}-fallback.img" ; then
++          initrd_real="initramfs-${version}-fallback.img"
++
++          if test -n "${initrd_real}" ; then
++            gettext_printf "Found fallback initrd image(s) in %s:%s\n" "${dirname}" "${initrd_extra} ${initrd_real}" >&2
++          fi
++
++          linux_entry "${OS}" "${version}" "${xen_version}" fallback \
++                      "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
++        fi
++
+ 	if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
+ 	    linux_entry "${OS}" "${version}" "${xen_version}" recovery \
+ 		"single ${GRUB_CMDLINE_LINUX}" "${GRUB_CMDLINE_XEN}"
diff --git a/20_linux_xen-detect-x86-xen-dom0-linux-list.patch b/20_linux_xen-detect-x86-xen-dom0-linux-list.patch
new file mode 100644
index 000000000000..d2feede06318
--- /dev/null
+++ b/20_linux_xen-detect-x86-xen-dom0-linux-list.patch
@@ -0,0 +1,25 @@
+diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
+index 3b1f47049..ec3895ee4 100644
+--- a/util/grub.d/20_linux_xen.in
++++ b/util/grub.d/20_linux_xen.in
+@@ -179,19 +179,7 @@ EOF
+ 
+ linux_list=
+ for i in /boot/vmlinu[xz]-* /vmlinu[xz]-* /boot/kernel-*; do
+-    if grub_file_is_not_garbage "$i"; then
+-    	basename=$(basename $i)
+-	version=$(echo $basename | sed -e "s,^[^0-9]*-,,g")
+-	dirname=$(dirname $i)
+-	config=
+-	for j in "${dirname}/config-${version}" "${dirname}/config-${alt_version}" "/etc/kernels/kernel-config-${version}" ; do
+-	    if test -e "${j}" ; then
+-		config="${j}"
+-		break
+-	    fi
+-	done
+-        if (grep -qx "CONFIG_XEN_DOM0=y" "${config}" 2> /dev/null || grep -qx "CONFIG_XEN_PRIVILEGED_GUEST=y" "${config}" 2> /dev/null); then linux_list="$linux_list $i" ; fi
+-    fi
++    if (grub_file_is_not_garbage "$i" && $grub_file --is-x86-xen-dom0 "$i") ; then linux_list="$linux_list $i" ; fi
+ done
+ if [ "x${linux_list}" = "x" ] ; then
+     exit 0
diff --git a/20_linux_xen-load-ucode-as-separate-multiboot-module.patch b/20_linux_xen-load-ucode-as-separate-multiboot-module.patch
new file mode 100644
index 000000000000..4aeb77c8461e
--- /dev/null
+++ b/20_linux_xen-load-ucode-as-separate-multiboot-module.patch
@@ -0,0 +1,44 @@
+diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
+index 3b1f47049..3d740264d 100644
+--- a/util/grub.d/20_linux_xen.in
++++ b/util/grub.d/20_linux_xen.in
+@@ -112,6 +112,9 @@ linux_entry_xsm ()
+       xen_version="$(gettext_printf "%s (XSM enabled)" "$xen_version")"
+       # xen_version is used for messages only; actual file is xen_basename
+   fi
++  if [ -n "$initrd_early" ] ; then
++      xen_args="$xen_args ucode=scan"
++  fi
+   if [ -z "$boot_device_id" ]; then
+       boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
+   fi
+@@ -153,16 +156,27 @@ linux_entry_xsm ()
+ 	echo	'$(echo "$lmessage" | grub_quote)'
+ 	${module_loader}	${rel_dirname}/${basename} placeholder root=${linux_root_device_thisversion} ro ${args}
+ EOF
+-  if test -n "${initrd}" ; then
++  if test -n "${initrd_real}" ; then
+     # TRANSLATORS: ramdisk isn't identifier. Should be translated.
+     message="$(gettext_printf "Loading initial ramdisk ...")"
+     initrd_path=
+-    for i in ${initrd}; do
++    for i in ${initrd_real}; do
+        initrd_path="${initrd_path} ${rel_dirname}/${i}"
+     done
+     sed "s/^/$submenu_indentation/" << EOF
+ 	echo	'$(echo "$message" | grub_quote)'
+ 	${module_loader}	--nounzip   $(echo $initrd_path)
++EOF
++  fi
++  if test -n "${initrd_early}" ; then
++    message="$(gettext_printf "Loading early microcode updates ...")"
++    ucode_path=
++    for i in ${initrd_early}; do
++       ucode_path="${ucode_path} ${rel_dirname}/${i}"
++    done
++    sed "s/^/$submenu_indentation/" << EOF
++        echo	'$(echo "$message" | grub_quote)'
++	${module_loader}	$(echo $ucode_path)
+ EOF
+   fi
+   if test -n "${xenpolicy}" ; then
diff --git a/20_linux_xen-remove-grub-submenu-for-multiple-xen-versions.patch b/20_linux_xen-remove-grub-submenu-for-multiple-xen-versions.patch
new file mode 100644
index 000000000000..4552ec51a409
--- /dev/null
+++ b/20_linux_xen-remove-grub-submenu-for-multiple-xen-versions.patch
@@ -0,0 +1,42 @@
+diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
+index 3b1f47049..bb12d4a76 100644
+--- a/util/grub.d/20_linux_xen.in
++++ b/util/grub.d/20_linux_xen.in
+@@ -245,9 +245,6 @@ while [ "x${xen_list}" != "x" ] ; do
+     if [ -z "$boot_device_id" ]; then
+ 	boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
+     fi
+-    if [ "x$is_top_level" != xtrue ]; then
+-	echo "	submenu '$(gettext_printf "Xen hypervisor, version %s" "${xen_version}" | grub_quote)' \$menuentry_id_option 'xen-hypervisor-$xen_version-$boot_device_id' {"
+-    fi
+     if ($grub_file --is-arm64-efi $current_xen); then
+ 	xen_loader="xen_hypervisor"
+ 	module_loader="xen_module"
+@@ -328,15 +325,14 @@ while [ "x${xen_list}" != "x" ] ; do
+ 	    linux_entry "${OS}" "${version}" "${xen_version}" simple \
+ 		"${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
+ 
+-	    submenu_indentation="$grub_tab$grub_tab"
++	    submenu_indentation="$grub_tab"
+     
+ 	    if [ -z "$boot_device_id" ]; then
+ 		boot_device_id="$(grub_get_device_id "${GRUB_DEVICE}")"
+ 	    fi
+             # TRANSLATORS: %s is replaced with an OS name
+ 	    echo "submenu '$(gettext_printf "Advanced options for %s (with Xen hypervisor)" "${OS}" | grub_quote)' \$menuentry_id_option 'gnulinux-advanced-$boot_device_id' {"
+-	echo "	submenu '$(gettext_printf "Xen hypervisor, version %s" "${xen_version}" | grub_quote)' \$menuentry_id_option 'xen-hypervisor-$xen_version-$boot_device_id' {"
+-	   is_top_level=false
++	    is_top_level=false
+ 	fi
+ 
+ 	linux_entry "${OS}" "${version}" "${xen_version}" advanced \
+@@ -348,9 +344,6 @@ while [ "x${xen_list}" != "x" ] ; do
+ 
+ 	list=`echo $list | tr ' ' '\n' | fgrep -vx "$linux" | tr '\n' ' '`
+     done
+-    if [ x"$is_top_level" != xtrue ]; then
+-	echo '	}'
+-    fi
+     xen_list=`echo $xen_list | tr ' ' '\n' | fgrep -vx "$current_xen" | tr '\n' ' '`
+ done
+ 
diff --git a/20_linux_xen-select-gzipped-xen-only.patch b/20_linux_xen-select-gzipped-xen-only.patch
new file mode 100644
index 000000000000..b2414bb845ef
--- /dev/null
+++ b/20_linux_xen-select-gzipped-xen-only.patch
@@ -0,0 +1,13 @@
+diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
+index 3b1f47049..f51a64ff8 100644
+--- a/util/grub.d/20_linux_xen.in
++++ b/util/grub.d/20_linux_xen.in
+@@ -211,7 +211,7 @@ file_is_not_xen_garbage () {
+ }
+ 
+ xen_list=
+-for i in /boot/xen*; do
++for i in /boot/xen*.gz; do
+     if grub_file_is_not_garbage "$i" && file_is_not_xen_garbage "$i" ; then xen_list="$xen_list $i" ; fi
+ done
+ prepare_boot_cache=
diff --git a/20_linux_xen-support-xen-realmode-with-grub-efi-boot.patch b/20_linux_xen-support-xen-realmode-with-grub-efi-boot.patch
new file mode 100644
index 000000000000..a6c4aa247283
--- /dev/null
+++ b/20_linux_xen-support-xen-realmode-with-grub-efi-boot.patch
@@ -0,0 +1,13 @@
+diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
+index 3b1f47049..8fb1c87a4 100644
+--- a/util/grub.d/20_linux_xen.in
++++ b/util/grub.d/20_linux_xen.in
+@@ -144,7 +144,7 @@ linux_entry_xsm ()
+   lmessage="$(gettext_printf "Loading Linux %s ..." ${version})"
+   sed "s/^/$submenu_indentation/" << EOF
+ 	echo	'$(echo "$xmessage" | grub_quote)'
+-        if [ "\$grub_platform" = "pc" -o "\$grub_platform" = "" ]; then
++        if [ "\$grub_platform" = "pc" -o "\$grub_platform" = "efi" -o "\$grub_platform" = "" ]; then
+             xen_rm_opts=
+         else
+             xen_rm_opts="no-real-mode edd=off"
diff --git a/PKGBUILD b/PKGBUILD
index d0f6ad20f35c..027eee809064 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -1,4 +1,5 @@
-# Maintainer: Llewelyn Trahaearn <WoefulDerelict [at] GMail [dot] com>
+# Maintainer: Chris Chapman <chris [dot] chapman [at] aggiemail [dot] usu [dot] edu>
+# Contributor: Llewelyn Trahaearn <WoefulDerelict [at] GMail [dot] com>
 # Contributor: Tobias Powalowski <tpowa [at] archlinux [dot] org>
 # Contributor: Ronald van Haren <ronald [at] archlinux [dot] org>
 # Contributor: Keshav Amburay <(the ddoott ridikulus ddoott rat) (aatt) (gemmaeiil) (ddoott) (ccoomm)>
@@ -9,17 +10,22 @@ _ia32_efi_in_arch_x64="1"
 ## "1" to enable EMU build, "0" to disable
 _grub_emu_build="1"
 
+## "1" to enable XEN build, "0" to disable
+_grub_xen_build="1"
+
 [[ "${CARCH}" == "x86_64" ]] && _target_arch="x86_64"
 [[ "${CARCH}" == "i686" ]] && _target_arch="i386"
 
 _build_platforms="i386-pc ${_target_arch}-efi"
 [[ "${CARCH}" == "x86_64" ]] && [[ "${_ia32_efi_in_arch_x64}" == "1" ]] && _build_platforms+=" i386-efi"
 [[ "${_grub_emu_build}" == "1" ]] && _build_platforms+=" ${_target_arch}-emu"
+[[ "${_grub_xen_build}" == "1" ]] && _build_platforms+=" i386-xen i386-xen_pvh"
+[[ "${_grub_xen_build}" == "1" ]] && [[ "${CARCH}" == "x86_64" ]] && _build_platforms+=" x86_64-xen"
 
-pkgname="grub-git"
-pkgver=2.04.rc1.r19.g4e7b5bb3b
+pkgname="grub-xen-git"
+pkgver=2.04.r141.ge7b8856f8
 pkgrel=1
-pkgdesc="GNU GRand Unified Bootloader (2)"
+pkgdesc="GNU GRand Unified Bootloader (2) with Xen platform support"
 arch=('x86_64' 'i686')
 url="https://www.gnu.org/software/grub/"
 license=('GPL3')
@@ -38,8 +44,8 @@ if [[ "${_grub_emu_build}" == "1" ]]; then
     optdepends+=('libusb: For grub-emu USB support')
 fi
 
-provides=("${pkgname%-*}")
-conflicts=("${pkgname%-*}")
+provides=('grub')
+conflicts=('grub' 'grub-git')
 backup=('etc/default/grub'
         'etc/grub.d/40_custom')
 install="${pkgname}.install"
@@ -47,20 +53,48 @@ source=("grub::git+https://git.savannah.gnu.org/git/grub.git"
         "grub-extras::git+https://git.savannah.gnu.org/git/grub-extras.git"
         "gnulib::git+https://git.savannah.gnu.org/git/gnulib.git"
         '10_linux-detect-archlinux-initramfs.patch'
+        '20_linux_xen-detect-archlinux-initramfs.patch'
+        '20_linux_xen-detect-x86-xen-dom0-linux-list.patch'
+        '20_linux_xen-load-ucode-as-separate-multiboot-module.patch'
+        '20_linux_xen-remove-grub-submenu-for-multiple-xen-versions.patch'
+        '20_linux_xen-select-gzipped-xen-only.patch'
+        '20_linux_xen-support-xen-realmode-with-grub-efi-boot.patch'
         'add-GRUB_COLOR_variables.patch'
         'grub.default')
 sha256sums=('SKIP'
             'SKIP'
             'SKIP'
             '171415ab075d1ac806f36c454feeb060f870416f24279b70104bba94bd6076d4'
+            'aa2f81e74c9eb09bfd0eced093ec0f38409b0001bd20e2cad9e2d9275c8e73c4'
+            '432ec7cda9d1a0c8e203d4cfd8ce8f046b967d2330a172ccbedca5345e5e7d08'
+            '0ac60de9cca4000825c34f601e1a135e01bda85af6e4bcd75751967c0cc5c00d'
+            'aa1edfce6193146def470ae61129af3cbdc20638419a37e7e72f543281cb9d53'
+            '7cec8e548a8cc6bd7dd26e7b81c1e43bfe270e89bff05382683ddbeeccf218bc'
+            'f0ccc146a3af7ecc14f5b1adbb0e0e5d03953839b336541741ba16737593e6ef'
             'a5198267ceb04dceb6d2ea7800281a42b3f91fd02da55d2cc9ea20d47273ca29'
-            '690adb7943ee9fedff578a9d482233925ca3ad3e5a50fffddd27cf33300a89e3')
+            'bd464f665372ee5211fe825153f31d3d499589cb3e7e25070340ddc0602727c1')
  
 prepare() {
     cd grub
 
     # Patch grub-mkconfig to detect Arch Linux initramfs images.
     patch -Np1 -i "$srcdir"/10_linux-detect-archlinux-initramfs.patch
+    patch -Np1 -i "$srcdir"/20_linux_xen-detect-archlinux-initramfs.patch
+
+    # Patch grub-mkconfig to detect Dom0-ready Arch Linux kernels.
+    patch -Np1 -i "$srcdir"/20_linux_xen-detect-x86-xen-dom0-linux-list.patch
+
+    # Patch grub-mkconfig to load microcode as separate module that Xen will scan.
+    patch -Np1 -i "$srcdir"/20_linux_xen-load-ucode-as-separate-multiboot-module.patch
+
+    # Patch grub-mkconfig to remove superfluous submenu for selecting Xen versions.
+    patch -Np1 -i "$srcdir"/20_linux_xen-remove-grub-submenu-for-multiple-xen-versions.patch
+
+    # Patch grub-mkconfig to select gzipped Xen kernels only.
+    patch -Np1 -i "$srcdir"/20_linux_xen-select-gzipped-xen-only.patch
+
+    # Patch grub-mkconfig to support GRUB EFI boot.
+    patch -Np1 -i "$srcdir"/20_linux_xen-support-xen-realmode-with-grub-efi-boot.patch
 
     # Patch to enable GRUB_COLOR_* variables in grub-mkconfig.
     # Based on http://lists.gnu.org/archive/html/grub-devel/2012-02/msg00021.html
@@ -70,10 +104,10 @@ prepare() {
     sed 's|/usr/share/fonts/dejavu|/usr/share/fonts/dejavu /usr/share/fonts/TTF|g' -i "configure.ac"
 
     # Modify grub-mkconfig behaviour to silence warnings FS#36275
-    sed 's| ro | rw |g' -i "util/grub.d/10_linux.in"
+    sed 's| ro | rw |g' -i util/grub.d/{10_linux,20_linux_xen}.in
 
     # Modify grub-mkconfig behaviour so automatically generated entries read 'Arch Linux' FS#33393
-    sed 's|GNU/Linux|Linux|' -i "util/grub.d/10_linux.in"
+    sed 's|GNU/Linux|Linux|' -i util/grub.d/{10_linux,20_linux_xen}.in
 
     # Pull in latest language files
     ./linguas.sh
diff --git a/grub-git.install b/grub-xen-git.install
index c13ef99c77c5..c13ef99c77c5 100644
--- a/grub-git.install
+++ b/grub-xen-git.install
diff --git a/grub.default b/grub.default
index d6d41a91345c..1105d5b7f7e7 100644
--- a/grub.default
+++ b/grub.default
@@ -6,6 +6,12 @@ GRUB_DISTRIBUTOR="Arch"
 GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet"
 GRUB_CMDLINE_LINUX=""
 
+GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT=""
+GRUB_CMDLINE_LINUX_XEN_REPLACE="earlyprintk=xen"
+
+GRUB_CMDLINE_XEN_DEFAULT=""
+GRUB_CMDLINE_XEN=""
+
 # Preload both GPT and MBR modules so that they are not missed
 GRUB_PRELOAD_MODULES="part_gpt part_msdos"