File grub2-s390x-04-grub2-install.patch of Package grub2

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File grub2-s390x-04-grub2-install.patch of Package grub2 (Revision 1118b91bcdfc883918ad107221d1d2c4)

Currently displaying revision 1118b91bcdfc883918ad107221d1d2c4 , Show latest

From: Raymund Will <rw@suse.com>
Subject: Allow s390x-emu to be "installed"
References: fate#314213, bnc#866867, bnc#868909, bnc#874155, bnc#876743,
	bnc#879136, bnc#889562, bnc#889572
Patch-Mainline: no

V2:
  * try harder to find root filesystem (incl. subvol-handling).
  * read /etc/sysconfig/bootloader as final fallback.
V3:
  * refresh initrd by default, prefer running kernel and
    re-zipl despite minor issues.  [bnc#866867, fate#314213]
V4:
  * append 'quiet splash=silent' for 'initgrub'-boot.
  * properly check for dracut script during 'grub2-install'.
  * move 'zipl2grub.pl' to '/usr/sbin/grub2-zipl-setup'.
V5:
  * actually call 'grub2-zipl-setup' from 'grub2-install'.
  * handle 'GRUB{,_EMU}_CONMODE'.  [bnc#868909]
V6:
  * grub2-zipl-setup: support 'xz' initrd compression.  [bnc#874155]
V7:
  * dracut-grub2.sh: use 'showconsole' to determine console device.  [bnc#876743]
  * dracut-grub2.sh: and fall back to '/dev/console' (instead of 'tty1').
  * dracut-grub2.sh: introduce "debug()" helper function.
V8:
  * grub2-zipl-setup: replace poor choice in '/sysroot/sys' check.  [bnc#879136]
  * grub2-zipl-setup: fix typo in '/sysroot/proc' check.
V9:
  * grub2-zipl-setup: honor GRUB_DISABLE_LINUX_UUID.  [bnc#885854]
V10:
  * grub2-zipl-setup: fix stupid typo in previous fix.  [bnc#889562, bnc#889572]
V11:
  * grub2-zipl-setup: disable 'grub-mkrelpath' acrobatics.  [bnc#889572]
V12:
 * dracut-grub2.sh: try to mount '/.snapshots' if missing.  [bnc#892014]
 * dracut-grub2.sh: use '/dev/shm' for debug output, so it's accessible
      from grub2-emu's shell.
V13:
 * grub2-zipl-setup: make initrd mount '/boot', if needed.  [bnc#873951, bnc#892088]
 * dracut-grub2.sh: provide /boot from above to grub2-emu in chroot.
V14:
 * grub2-zipl-setup: actually remove obsolete kernel/initrds.  [bnc#892810]
V15:
 * zipl2grub.conf: turn of zipl-prompt and quiescent plymouth.  [bsc#898198]
V16:
 * dracut-grub2.sh: force read-only '/usr' for kexec.  [bsc#932951]
V17:
 * grub2-zipl-setup: remove arybase dependency by not referencing $[.  [bsc#1055280]
V18:
 * dracut-zipl-refresh.sh.in: initial submission.  [bsc#1127293]
 * dracut-grub2.sh: try to call zipl-refresh on failed kexec and drop
   to an emergency shell otherwise
V19:
 * dracut-grub2.sh: use 'grep -P' instead of '-E'.  [bsc#1136970]
V20:
 * dracut-grub2.sh: add support for '/boot/writable'.  [bsc#1190395]

--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -377,6 +377,7 @@
   ldadd = grub-core/lib/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
   cppflags = '-DGRUB_SETUP_FUNC=grub_util_bios_setup';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
@@ -397,6 +398,7 @@
   ldadd = grub-core/lib/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
   cppflags = '-DGRUB_SETUP_FUNC=grub_util_sparc_setup';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
@@ -412,6 +414,7 @@
   ldadd = libgrubkern.a;
   ldadd = grub-core/lib/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
@@ -442,6 +445,7 @@
   ldadd = libgrubkern.a;
   ldadd = grub-core/lib/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBUTIL) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
+  emu_condition = COND_NOT_s390x;
 };
 
 data = {
@@ -665,6 +669,7 @@
   common = grub-core/disk/host.c;
 
   common = util/resolve.c;
+  emu_condition = COND_s390x;
   common = grub-core/kern/emu/argp_common.c;
   common = grub-core/osdep/init.c;
 
@@ -734,6 +739,46 @@
 };
 
 script = {
+  name = grub-zipl-setup;
+  installdir = sbin;
+  common = util/s390x/zipl2grub.pl.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+};
+
+data = {
+  name = zipl2grub.conf.in;
+  common = util/s390x/zipl2grub.conf.in;
+  installdir = grubconf;
+  enable = emu;
+  emu_condition = COND_s390x;
+};
+
+script = {
+  name = dracut-module-setup.sh;
+  common = util/s390x/dracut-module-setup.sh.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+  installdir = platform;
+};
+
+script = {
+  name = dracut-grub.sh;
+  common = util/s390x/dracut-grub2.sh.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+  installdir = platform;
+};
+
+script = {
+  name = dracut-zipl-refresh;
+  common = util/s390x/dracut-zipl-refresh.sh.in;
+  enable = emu;
+  emu_condition = COND_s390x;
+  installdir = platform;
+};
+
+script = {
   name = grub-mkconfig_lib;
   common = util/grub-mkconfig_lib.in;
   installdir = noinst;
@@ -1381,6 +1426,7 @@
   ldadd = libgrubkern.a;
   ldadd = grub-core/lib/gnulib/libgnu.a;
   ldadd = '$(LIBINTL) $(LIBDEVMAPPER) $(LIBZFS) $(LIBNVPAIR) $(LIBGEOM)';
+  emu_condition = COND_NOT_s390x;
 };
 
 program = {
--- a/configure.ac
+++ b/configure.ac
@@ -211,9 +211,9 @@
    esac
 fi
 
-if test x"$target_cpu-$platform" = xsparc64-emu ; then
-   target_m64=1
-fi
+case x"$target_cpu-$platform" in
+    xsparc64-emu | xs390x-emu) target_m64=1 ;;
+esac
 
 case "$target_os" in
   windows* | mingw32*) target_os=cygwin ;;
@@ -2158,6 +2158,9 @@
 AM_CONDITIONAL([COND_sparc64_emu], [test x$target_cpu = xsparc64 -a x$platform = xemu])
 AM_CONDITIONAL([COND_x86_64_efi], [test x$target_cpu = xx86_64 -a x$platform = xefi])
 AM_CONDITIONAL([COND_x86_64_xen], [test x$target_cpu = xx86_64 -a x$platform = xxen])
+AM_CONDITIONAL([COND_s390x], [test x$target_cpu = xs390x ])
+AM_CONDITIONAL([COND_NOT_s390x], [test x$target_cpu != xs390x ])
+AM_CONDITIONAL([COND_s390x_emu], [test x$target_cpu = xs390x -a x$platform = xemu])
 
 AM_CONDITIONAL([COND_HOST_HURD], [test x$host_kernel = xhurd])
 AM_CONDITIONAL([COND_HOST_LINUX], [test x$host_kernel = xlinux])
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1186,6 +1186,7 @@
 module = {
   name = videotest;
   common = commands/videotest.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -1640,6 +1641,7 @@
   common = gfxmenu/gui_progress_bar.c;
   common = gfxmenu/gui_util.c;
   common = gfxmenu/gui_string_util.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -2078,11 +2080,13 @@
   name = gfxterm;
   common = term/gfxterm.c;
   enable = videomodules;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
   name = gfxterm_background;
   common = term/gfxterm_background.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -2205,6 +2209,7 @@
   enable = x86_64_efi;
   enable = emu;
   enable = xen;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -2251,6 +2256,7 @@
 module = {
   name = gfxterm_menu;
   common = tests/gfxterm_menu.c;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
@@ -2412,6 +2418,7 @@
   enable = x86_64_efi;
   enable = emu;
   enable = xen;
+  emu_condition = COND_NOT_s390x;
 };
 
 module = {
--- a/grub-core/osdep/basic/no_platform.c
+++ b/grub-core/osdep/basic/no_platform.c
@@ -44,3 +44,10 @@
 {
   grub_util_error ("%s", _("no SGI routines are available for your platform"));
 }
+
+void
+grub_install_zipl (const char *d, int i, int f)
+{
+  grub_util_error ("%s", _("no zIPL routines are available for your platform"));
+}
+
--- a/grub-core/osdep/unix/platform.c
+++ b/grub-core/osdep/unix/platform.c
@@ -239,3 +239,14 @@
 	imgfile, destname, NULL });
   grub_util_warn ("%s", _("You will have to set `SystemPartition' and `OSLoader' manually."));
 }
+
+void
+grub_install_zipl (const char *dest, int install, int force)
+{
+  if (grub_util_exec ((const char * []){ PACKAGE"-zipl-setup",
+	verbosity ? "-v" : "",
+	install ? "" : "--debug",
+	!force ? "" : "--force",
+	"-z", dest, NULL }))
+    grub_util_error (_("`%s' failed.\n"), PACKAGE"-zipl-setup");
+}
--- a/grub-core/osdep/windows/platform.c
+++ b/grub-core/osdep/windows/platform.c
@@ -434,3 +434,9 @@
 {
   grub_util_error ("%s", _("no SGI routines are available for your platform"));
 }
+
+void
+grub_install_zipl (const char *d, int i, int f)
+{
+  grub_util_error ("%s", _("no zIPL routines are available for your platform"));
+}
--- a/include/grub/util/install.h
+++ b/include/grub/util/install.h
@@ -110,6 +110,7 @@
     GRUB_INSTALL_PLATFORM_LOONGARCH64_EFI,
     GRUB_INSTALL_PLATFORM_RISCV32_EFI,
     GRUB_INSTALL_PLATFORM_RISCV64_EFI,
+    GRUB_INSTALL_PLATFORM_S390X_EMU,
     GRUB_INSTALL_PLATFORM_MAX
   };
 
@@ -237,6 +238,9 @@
 grub_install_sgi_setup (const char *install_device,
 			const char *imgfile, const char *destname);
 
+void
+grub_install_zipl (const char *d, int i, int f);
+
 int
 grub_install_compress_gzip (const char *src, const char *dest);
 int
--- a/util/grub-install-common.c
+++ b/util/grub-install-common.c
@@ -924,6 +924,7 @@
     [GRUB_INSTALL_PLATFORM_LOONGARCH64_EFI] =  { "loongarch64", "efi"       },
     [GRUB_INSTALL_PLATFORM_RISCV32_EFI] =      { "riscv32",     "efi"       },
     [GRUB_INSTALL_PLATFORM_RISCV64_EFI] =      { "riscv64",     "efi"       },
+    [GRUB_INSTALL_PLATFORM_S390X_EMU] =        { "s390x",   "emu"       },
   };
 
 char *
--- a/util/grub-install.c
+++ b/util/grub-install.c
@@ -66,6 +66,7 @@
 static char *disk_module = NULL;
 static char *efidir = NULL;
 static char *macppcdir = NULL;
+static char *zipldir = NULL;
 static int force = 0;
 static int have_abstractions = 0;
 static int have_cryptodisk = 0;
@@ -106,6 +107,7 @@
     OPTION_NO_BOOTSECTOR,
     OPTION_NO_RS_CODES,
     OPTION_MACPPC_DIRECTORY,
+    OPTION_ZIPL_DIRECTORY,
     OPTION_LABEL_FONT,
     OPTION_LABEL_COLOR,
     OPTION_LABEL_BGCOLOR,
@@ -181,6 +183,11 @@
       efidir = xstrdup (arg);
       return 0;
 
+    case OPTION_ZIPL_DIRECTORY:
+      free (zipldir);
+      zipldir = xstrdup (arg);
+      return 0;
+
     case OPTION_DISK_MODULE:
       free (disk_module);
       disk_module = xstrdup (arg);
@@ -298,6 +305,8 @@
    N_("use DIR as the EFI System Partition root."), 2},
   {"macppc-directory", OPTION_MACPPC_DIRECTORY, N_("DIR"), 0,
    N_("use DIR for PPC MAC install."), 2},
+  {"zipl-directory", OPTION_ZIPL_DIRECTORY, N_("DIR"), 0,
+   N_("use DIR as the zIPL Boot Partition root."), 2},
   {"label-font", OPTION_LABEL_FONT, N_("FILE"), 0, N_("use FILE as font for label"), 2},
   {"label-color", OPTION_LABEL_COLOR, N_("COLOR"), 0, N_("use COLOR for label"), 2},
   {"label-bgcolor", OPTION_LABEL_BGCOLOR, N_("COLOR"), 0, N_("use COLOR for label background"), 2},
@@ -334,6 +343,8 @@
 #else
    return NULL;
 #endif
+#elif defined (__s390x__)
+   return "s390x-emu";
 #else
    return NULL;
 #endif
@@ -510,6 +521,8 @@
     case GRUB_INSTALL_PLATFORM_I386_XEN:
     case GRUB_INSTALL_PLATFORM_X86_64_XEN:
     case GRUB_INSTALL_PLATFORM_I386_XEN_PVH:
+
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
       return 0;
 
       /* pacify warning.  */
@@ -939,6 +952,7 @@
     case GRUB_INSTALL_PLATFORM_I386_XEN:
     case GRUB_INSTALL_PLATFORM_X86_64_XEN:
     case GRUB_INSTALL_PLATFORM_I386_XEN_PVH:
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
       break;
 
     case GRUB_INSTALL_PLATFORM_I386_QEMU:
@@ -990,6 +1004,7 @@
     case GRUB_INSTALL_PLATFORM_I386_XEN:
     case GRUB_INSTALL_PLATFORM_X86_64_XEN:
     case GRUB_INSTALL_PLATFORM_I386_XEN_PVH:
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
       free (install_device);
       install_device = NULL;
       break;
@@ -1291,6 +1306,20 @@
 	}
     }
 
+  if (platform == GRUB_INSTALL_PLATFORM_S390X_EMU)
+    {
+      if (!zipldir)
+	{
+	  char *d = grub_util_path_concat (2, bootdir, "zipl");
+	  if (!grub_util_is_directory (d))
+	    {
+	      free (d);
+	      grub_util_error ("%s", _("cannot find zIPL directory"));
+	    }
+	  zipldir = d;
+	}
+    }
+
   size_t ndev = 0;
 
   /* Write device to a variable so we don't have to traverse /dev every time.  */
@@ -1543,6 +1572,7 @@
 		  case GRUB_INSTALL_PLATFORM_I386_XEN:
 		  case GRUB_INSTALL_PLATFORM_X86_64_XEN:
 		  case GRUB_INSTALL_PLATFORM_I386_XEN_PVH:
+		  case GRUB_INSTALL_PLATFORM_S390X_EMU:
 		    grub_util_warn ("%s", _("no hints available for your platform. Expect reduced performance"));
 		    break;
 		    /* pacify warning.  */
@@ -1661,6 +1691,10 @@
       strcpy (mkimage_target, "sparc64-ieee1275-raw");
       core_name = "core.img";
       break;
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
+      strcpy (mkimage_target, "grub2-emu");
+      core_name = mkimage_target;
+      break;
       /* pacify warning.  */
     case GRUB_INSTALL_PLATFORM_MAX:
       break;
@@ -1676,6 +1710,7 @@
 				       core_name);
   char *prefix = xasprintf ("%s%s", prefix_drive ? : "",
 			    relative_grubdir);
+  if (core_name != mkimage_target)
   grub_install_make_image_wrap (/* source dir  */ grub_install_source_directory,
 				/*prefix */ prefix,
 				/* output */ imgfile,
@@ -1714,6 +1749,10 @@
 				       /* image target */ mkimage_target, 0);
       }
       break;
+
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
+      break;
+
     case GRUB_INSTALL_PLATFORM_ARM_EFI:
     case GRUB_INSTALL_PLATFORM_ARM64_EFI:
     case GRUB_INSTALL_PLATFORM_LOONGARCH64_EFI:
@@ -2013,6 +2052,10 @@
 	}
       break;
 
+    case GRUB_INSTALL_PLATFORM_S390X_EMU:
+      grub_install_zipl (zipldir, install_bootsector, force);
+      break;
+
     case GRUB_INSTALL_PLATFORM_MIPSEL_LOONGSON:
     case GRUB_INSTALL_PLATFORM_MIPSEL_QEMU_MIPS:
     case GRUB_INSTALL_PLATFORM_MIPS_QEMU_MIPS:
--- /dev/null
+++ b/util/s390x/dracut-grub2.sh.in
@@ -0,0 +1,141 @@
+#!/bin/sh
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+#getargbool() { true; }
+
+if getargbool 0 initgrub && [ ! -e /grub2skip ] || [ -e /grub2force ]; then
+  #type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
+  checkro() {
+   local tgt="$1"
+   local dev mp fs opts dc
+   local rofs=true
+   while read dev mp fs opts dc; do
+     [ "$mp" = "$tgt" ] || continue
+     case ",$opts," in
+     (*,ro,*) rofs=true;;
+     (*)      rofs=false;;
+     esac
+   done < /proc/mounts
+   echo $rofs
+  }
+  checkd() {
+    [ -d $1 ] && echo true || echo false
+  }
+  checke() {
+    [ -e $1 ] && echo true || echo false
+  }
+  checksubvol() {
+    local tgt="$1"
+    local tst="$2"
+    if [ -n "$tst" -a -e "/sysroot$tgt/$tst" ]; then
+      echo true
+    elif grep  -qP '^[^#\s]+\s+'"$tgt"'\s+' /sysroot/etc/fstab; then
+      echo false
+    else
+      echo true
+    fi
+  }
+  checksnap() {
+    # checksubvol /.snapshots grub-snapshot.cfg
+    if [ -e /sysroot/.snapshots/grub-snapshot.cfg ]; then
+      echo true
+    elif grep  -qP '^[^#\s]+\s+/.snapshots\s+' /sysroot/etc/fstab; then
+      echo false
+    else
+      echo true
+    fi
+  }
+  checkboot() {
+    [ -d /boot/grub2 ] && echo false || echo true
+  }
+  getterm() {
+    local term="$(getarg TERM)"
+    [ -z "$term" ] && term=dumb
+    echo $term
+  }
+  debug() {
+    if [ -n "$1" ]; then
+      echo "$1" >> /dev/.grub2.debug
+    fi
+    shift;
+    [ -n "$*" ] || return 0
+    echo "+ $*" >> /dev/.grub2.debug
+    "$@" >> /dev/.grub2.debug
+  }
+
+  exec_prefix=@exec_prefix@
+  bindir=@bindir@
+  if [ -e /sysroot$bindir/grub2-emu ]; then
+
+    export TERM=$(getterm)
+    export grub2rofs=$(checkro /sysroot)
+    export grub2roufs=$(checkro /sysroot/usr)
+    export grub2sysfs=$(checkd /sysroot/sys/devices/system/memory)
+    export grub2procfs=$(checkd /sysroot/proc/self)
+    export grub2bootfs=$(checkboot)
+    export grub2bootw=$(checksubvol /boot/writable)
+    export grub2devfs=$(checkd /sysroot/dev/disk)
+    export grub2snap=$(checksnap)
+    debug "" export -p
+
+        _ctty="$(RD_DEBUG= getarg rd.ctty=)" && _ctty="/dev/${_ctty##*/}"
+        if [ -z "$_ctty" ]; then
+	    _ctty=$(showconsole)
+	fi
+        if [ -z "$_ctty" ]; then
+            _ctty=console
+            while [ -f /sys/class/tty/$_ctty/active ]; do
+                _ctty=$(cat /sys/class/tty/$_ctty/active)
+                _ctty=${_ctty##* } # last one in the list
+            done
+            _ctty=/dev/$_ctty
+        fi
+        [ -c "$_ctty" ] || _ctty=/dev/console
+        case "$(/usr/bin/setsid --help 2>&1)" in *--ctty*) CTTY="--ctty";; esac
+
+    CTTY="$CTTY --wait"
+    $grub2rofs || mount -o remount,ro /sysroot
+    $grub2roufs || mount -o remount,ro /sysroot/usr
+    $grub2sysfs || mount --bind {,/sysroot}/sys
+    $grub2procfs || mount --bind {,/sysroot}/proc
+    $grub2bootfs || mount --bind {,/sysroot}/boot
+    $grub2devfs || mount --bind {,/sysroot}/dev
+    $grub2snap || chroot /sysroot mount -rn /.snapshots
+    $grub2bootw || chroot /sysroot mount -rn /boot/writable
+    debug "" cat /proc/mounts
+
+    debug "Trying grub2-emu (ro=$grub2rofs, TERM=$TERM, ctty=$_ctty)..."
+    setsid $CTTY -- chroot /sysroot $bindir/grub2-emu -X -X 0<>$_ctty 1>&0 2>&0
+
+    if [ -x /sysroot@libdir@/grub2/zipl-refresh ]; then
+	setsid $CTTY -- /sysroot@libdir@/grub2/zipl-refresh 0<>$_ctty 1>&0 2>&0
+	if [ $? != 0 ]; then
+	    warn "Not continuing"
+	    emergency_shell -n grub2-emu-zipl-refresh
+	else
+	    echo "+ reboot" >& $_ctty
+	    sleep 3
+	    reboot
+	fi
+    else
+	echo "
+  Attention: 'grub2' failed to start the target kernel and 'zipl-refresh'
+  is not available.  This should never happen.  Please contact support." >& $_ctty
+	warn "Not continuing"
+	emergency_shell -n grub2-emu-kexec
+    fi
+
+    $grub2snap || umount /sysroot/.snapshots
+    $grub2devfs || umount /sysroot/dev
+    $grub2bootw || umount /sysroot/boot/writable
+    $grub2bootfs || umount /sysroot/boot
+    $grub2procfs || umount /sysroot/proc
+    $grub2sysfs || umount /sysroot/sys
+    $grub2roufs || mount -o remount,rw /sysroot/usr
+    $grub2rofs || mount -o remount,rw /sysroot
+  else
+    warn "No $bindir/grub2-emu in /sysroot--dropping to emergency shell..."
+    emergency_shell -n no-grub2-emu
+  fi
+fi
+
--- /dev/null
+++ b/util/s390x/dracut-module-setup.sh.in
@@ -0,0 +1,19 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+# called by dracut
+check() {
+    local _arch=$(uname -m)
+    [ "$_arch" = "s390" -o "$_arch" = "s390x" ] || return 1
+    return 0
+}
+
+# called by dracut
+install() {
+    inst_hook cleanup 99 "$moddir/grub2.sh"
+    inst_multiple showconsole
+    inst_multiple mount umount chroot cat grep /usr/bin/setsid
+    #inst_multiple grub2-emu kexec
+}
+
--- /dev/null
+++ b/util/s390x/zipl2grub.conf.in
@@ -0,0 +1,26 @@
+## This is the template for '@zipldir@/config' and is subject to
+## rpm's %config file handling in case of grub2-s390x-emu package update.
+
+[defaultboot]
+defaultmenu = menu
+
+[grub2]
+    target = @zipldir@
+    ramdisk = @zipldir@/initrd,0x2000000
+    image = @zipldir@/image
+    parameters = "root=@GRUB_DEVICE@ @GRUB_EMU_CONMODE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ initgrub quiet splash=silent plymouth.enable=0 "
+
+[skip-grub2]
+    target = @zipldir@
+    ramdisk = @zipldir@/initrd,0x2000000
+    image = @zipldir@/image
+    parameters = "root=@GRUB_DEVICE@ @GRUB_CONMODE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ "
+
+:menu
+    target = @zipldir@
+    timeout = 16
+    default = 1
+    prompt = 0
+    1 = grub2
+    2 = skip-grub2
+
--- /dev/null
+++ b/util/s390x/zipl2grub.pl.in
@@ -0,0 +1,423 @@
+#!/usr/bin/perl
+use strict;
+
+my $C = $0; $C =~ s{^.*/}{};
+
+my $in = '@sysconfdir@/default/zipl2grub.conf.in';
+my $default = '@sysconfdir@/default/grub';
+my $fallback = '@sysconfdir@/zipl.conf';
+my $sysconfbl = '@sysconfdir@/sysconfig/bootloader';
+my $zipldir = "";
+my $running = "";
+my $refresh = 1; # needs to default to "on" until most bugs are shaken out!
+my $force = 0;
+my $verbose = 0;
+my $debug = 0;
+my $miss = 0;
+my $cfg = "";
+my %fsdev = ();
+my %fstype = ();
+
+my %C = (
+  GRUB_CMDLINE_LINUX_DEFAULT => "quiet splash=silent",
+  GRUB_DISABLE_LINUX_UUID => "false",
+);
+
+my %Mandatory = (
+  GRUB_CMDLINE_LINUX_DEFAULT => 1,
+  GRUB_DEVICE => 1,
+);
+
+sub Panic($$) {
+  printf( STDERR "%s", $_[1]);
+  exit( $_[0]);
+}
+sub Info($$) {
+  printf( STDERR "%s", $_[1]) if ($_[0] <= $verbose);
+}
+sub System(@) {
+  my (@C) =@_;
+  Info( 1, "+ " . join( " ", @C) . "\n");
+  return 0 if ($debug);
+  system( @C);
+  if ($? == -1) {
+    Panic( $?, "$C[0]: Failed to execute: $!\n");
+  } elsif ($? & 127) {
+    Panic( $?, sprintf( "$C[0]: Died with signal %d with%s coredump\n",
+           ($? & 127),  ($? & 128) ? '' : 'out'));
+  } elsif ( $? >> 8 != 0 ) {
+    Panic( $?, "$C[0]: Failed\n");
+  }
+  return( 0);
+}
+sub cp($$) {
+  my @C = ( "cp", "-p", $_[0], $_[1]);
+  System( @C);
+}
+sub rm($) {
+  return( 0) unless ( -l $_[0] || -e $_[0]);
+  Info( 2, "+ rm $_[0]\n");
+  return 0 if ($debug);
+  unlink( $_[0]) || Panic( 1, "$C: unlink: $!.\n");
+}
+sub mv($$) {
+  Info( 1, "+ mv $_[0] $_[1]\n");
+  return 0 if ($debug);
+  rename($_[0], $_[1]) || Panic( 1, "$C: rename: $!.\n");
+}
+sub ln($$) {
+  Info( 1, "+ ln -sf $_[0] $_[1]\n");
+  return 0 if ($debug);
+  unlink( $_[1]) || Panic( 1, "$C: unlink: $!.\n") if ( -e $_[1]);
+  symlink($_[0], $_[1]) || Panic( 1, "$C: symlink: $!.\n");
+}
+sub BootCopy($$$) {
+  my( $file, $dir, $tgt) = @_;
+  my $curr = "$dir/$tgt";
+  my $prev = "$dir/$tgt.prev";
+  Info(4, "Copy /boot/$file $dir $tgt\n");
+  if ( -l $curr ) {
+    my $curf = readlink( $curr);
+    if ( $curf ne $file ) {
+      if ( -l $prev ) {
+	my $pref = readlink( $prev);
+	$pref = "$dir/$pref" unless ($pref =~ m{^/});
+	rm( $pref);
+      }
+      mv( $curr, $prev);
+    }
+  }
+  cp( "/boot/$file", "$dir/$file");
+  ln( $file, $curr);
+}
+sub MkInitrd($$$) {
+  my( $initrd, $dir, $version) = @_;
+  my @C = ( "dracut", "--hostonly", "--force");
+  my $uuid;
+  if ( exists( $fsdev{"/boot"}) ) {
+  chomp( $uuid = qx{grub2-probe --target=fs_uuid /boot});
+    my ($dev, $type) = ($fsdev{"/boot"},  $fstype{"/boot"});
+    if ( $type eq "auto" ) {
+      chomp( $type = qx{grub2-probe --target=fs /boot});
+    }
+    if ($C{GRUB_DISABLE_LINUX_UUID} eq "true" &&
+	$dev =~ m{^(UUID=|/dev/disk/by-uuid/)}) {
+      chomp( $dev = qx{grub2-probe --target=device /boot});
+    }
+    push @C, "--mount", "$dev /boot $type ro";
+  }
+  push @C, "$dir/$initrd", $version;
+  System( @C);
+  ln( $initrd, "$dir/initrd");
+}
+sub ChkInitrd($$) {
+  my( $dir, $initrd) = @_;
+  my $found = -1;
+  my $d = $dir;
+  my $pattern = qr{lib/dracut/hooks/cleanup/99-grub2.sh};
+  my $show = "cleanup/99-grub2.sh";
+  my $cat = undef;
+  my $magic;
+
+  return $found unless (-r "$dir/$initrd");
+  open( IN, "< $dir/$initrd") || return $found;
+  my $rd = sysread( IN, $magic, 6);
+  close( IN);
+  return $found unless (defined( $rd) && $rd == 6);
+  $cat = "xzcat" if ($magic eq "\xFD7zXZ\x00");
+  $cat = "zcat"  if (substr($magic, 0, 2) eq "\037\213");
+  $cat = "cat"   if (substr($magic, 0, 5) eq "07070");
+  return $found unless (defined($cat));
+
+  my $modinst = "/usr/lib/dracut/modules.d/99grub2/module-setup.sh";
+  if ( -r $modinst ) {
+    my( $hook, $ord, $script);
+    my $pat = qr{^\s*inst_hook\s+(\S+)\s+([0-9]+)\s+\"\$moddir/(grub2\.sh)\"};
+    open( IN, "< $modinst") || die;
+    while ( <IN> ) {
+      next unless ($_ =~ $pat);
+      $show = "$1/$2-$3";
+      $pattern = qr{lib/dracut/hooks/$show}o;
+      last;
+    }
+    close( IN);
+  }
+
+  $found = 0;
+  Info( 3, "+ $cat $d/$initrd | cpio -it | grep '$show'\n");
+  open( IN, "$cat $d/$initrd | cpio -it 2>/dev/null |") ||
+     Panic( 1, "$C: cpio: $!.\n");
+  while ( <IN> ) {
+    $found = 1 if ($_ =~ $pattern);
+  }
+  close( IN);
+  return $found;
+}
+
+sub Usage($) {
+  my @cat = ("",
+	"Parameter error.",
+	"zIPL directory missing.",
+	"Configuration template missing.",
+	"Configuration template unreadable.",
+	"zIPL directory not accesible.",
+	""
+  );
+  my $msg = "";
+
+  $msg .= sprintf( "%s: %s\n", $C, $cat[$_[0]]) if ($_[0] > 0);
+  $msg .= "Usage: $C [-v] [-d] [-f] [-T template] [-z ZIPLDIR]\n";
+  Panic( $_[0], $msg . "\n");
+}
+
+while ( $#ARGV >= 0 ) {
+  $_ = shift;
+  next if /^$/;
+  last if /^--$/;
+  (/^--verbose$/ || /^-v$/)   && ($verbose++, next);
+  (/^--quiet$/ || /^-q$/)     && ($verbose = 0, next);
+  (/^--debug$/ || /^-d$/)     && ($debug = 1, $verbose++, next);
+  (/^--force$/ || /^-f$/)     && ($force = $refresh = 1, next);
+  (/^--refresh$/ || /^-r$/)   && ($refresh = 1, next);
+  (/^--keep$/ || /^-k$/)      && ($refresh = 0, next);
+  (/^--?help/ || /^-h/)       && (Usage(0));
+  (/^--zipldir$/ || /^-z$/)   && ($zipldir = shift || Usage(2), next);
+  (/^--template$/ || /^-T$/)  && ($in = shift || Usage(3), next);
+  (/^-/)                      && (Usage(1));
+  Usage(1);
+}
+Usage(4) if (! -r $in);
+
+if ($zipldir) {
+  $C{zipldir} = $zipldir;  # command-line wins
+} elsif ( exists( $C{zipldir}) ) {
+  $zipldir = $C{zipldir};  # otherwise fall back to config
+} else {
+  $zipldir = $C{zipldir} = "/boot/zipl"; # but don't proceed without...
+}
+Usage(5) if (! -d $zipldir);
+if ( $zipldir eq "/boot" ) {
+  Panic( 5, "$C: zIPL directory '/boot' not supported!\n");
+}
+
+if ( ! -r $default && ! -r $fallback && ! -r $sysconfbl ) {
+  Panic( 0, "$C: No configuration files found. Retry later!\n");
+}
+if ( -r $default ) {
+  open( IN, "< $default") || die;
+  while ( <IN> ) {
+    chomp;
+    s{^\s*#.*$}{};
+    next if m{^\s*$};
+    s{x}{\x01xx\x01}g;
+    s{\\\"}{\x01x1\x01}g;
+    s{\\\'}{\x01x2\x01}g;
+    Info( 5, "<$_>\n");
+    if ( m{^([^\s=]+)='([^']*)'\s*(?:#.*)?$} ||
+         m{^([^\s=]+)="([^"]*)"\s*(?:#.*)?$} ||
+         m{^([^\s=]+)=(\S*)\s*(?:#.*)?$} ) {
+      my ( $k, $v) = ($1, $2);
+      $v =~ s{\x01x2\x01}{\\'}g;
+      $v =~ s{\x01x1\x01}{\\"}g;
+      $v =~ s{\x01xx\x01}{x}g;
+      $C{$k} = $v;
+      next;
+    }
+    print( STDERR "$default:$.: parse error ignored.\n");
+  }
+  close( IN);
+}
+if ( -r "/etc/fstab" ) {
+  my $regex = qr{^(\S+)\s+(\S+)\s+(\S+)\s+\S+\s+\S+\s+\S+\s*(?:#.*)?$};
+  open( IN, "< /etc/fstab") || die;
+  while ( <IN> ) {
+    next if ( m{^\s*#} );
+    my ($dev, $mp, $type) = (m{$regex}o);
+    $fsdev{$mp} = $dev;
+    $fstype{$mp} = $type;
+  }
+  close( IN);
+}
+
+if ( ! exists( $C{GRUB_DEVICE}) &&
+     $C{GRUB_CMDLINE_LINUX_DEFAULT} eq "quiet splash=silent" &&
+     -r $fallback ) {
+  # configuration incomplete, let's try fallback
+    open( IN, "< $fallback") || die;
+    my $section = "";
+    while( <IN> ){
+      if ( m{^\[([^\]]+)\]\s*$} ) {
+        $section = $1;
+      }
+      if ( $section eq "ipl" &&
+	   m{^\s*parameters\s*=\s*\"root=(\S+)(?:\s*|\s+([^\"]+))\"} ) {
+        $C{GRUB_DEVICE} = $1;
+        $C{GRUB_CMDLINE_LINUX_DEFAULT} = $2 if (defined($2) && $2 !~ m{^\s*$});
+        last;
+      }
+    }
+    close( IN);
+    $default = $fallback;
+}
+
+if ( ! exists( $C{GRUB_DEVICE}) && exists( $fsdev{"/"}) ) {
+  my( $dev, $type, $subvol) = ( $fsdev{"/"}, $fstype{"/"}, "");
+  if ( $dev !~ m{^(UUID=|/dev/disk/by-uuid/)} ||
+       $C{GRUB_DISABLE_LINUX_UUID} ne "true" ) {
+    $C{GRUB_DEVICE} = $dev;
+    # grub2-mkrelpath fails on rollback -- and provides no known merit...
+    #chomp( $subvol = qx{grub2-mkrelpath /}) if ( $type eq "btrfs" );
+    #$subvol =~ s{^/}{};
+    #$C{GRUB_DEVICE} .= " rootflags=subvol=$subvol" if ($subvol);
+  }
+}
+if ( ! exists( $C{GRUB_DEVICE}) ) {
+  my( $dev, $uuid, $type, $subvol) = ("", "", "", "");
+  chomp( $dev  = qx{grub2-probe --target=device /});
+  chomp( $uuid = qx{grub2-probe --device $dev --target=fs_uuid});
+  if ( $dev ) {
+    if ( $uuid && $C{GRUB_DISABLE_LINUX_UUID} ne "true" ) {
+      $C{GRUB_DEVICE} = "UUID=$uuid";
+    } else {
+      $C{GRUB_DEVICE} = "$dev";
+    }
+    chomp( $type = qx{stat -f --printf='%T' /});
+    # grub2-mkrelpath fails on rollback -- and provides no known merit...
+    #chomp( $subvol = qx{grub2-mkrelpath /}) if ( $type eq "btrfs" );
+    #$subvol =~ s{^/}{};
+    #$C{GRUB_DEVICE} .= " rootflags=subvol=$subvol" if ($subvol);
+  }
+}
+if ( $C{GRUB_CMDLINE_LINUX_DEFAULT} eq "quiet splash=silent" &&
+     -r $sysconfbl) {
+  open( IN, "< $sysconfbl") ||  die;
+  while ( <IN> ) {
+    next if ( m{^\s*#} );
+    if ( m{^DEFAULT_APPEND=".*"(?:\s*|\s+#.*)$} ) {
+      $C{GRUB_CMDLINE_LINUX_DEFAULT} = $1;
+    }
+  }
+  close( IN);
+}
+
+if ( ! exists( $C{GRUB_DEVICE})) {
+  Panic( 0, "$C: Default not ready and no fallback.  Please retry later!\n");
+}
+
+if ( ! exists( $C{GRUB_EMU_CONMODE}) && exists( $C{GRUB_CONMODE}) ) {
+  # GRUB_CONMODE is used for 'grub2-emu' as well
+  $C{GRUB_EMU_CONMODE} = $C{GRUB_CONMODE};
+}
+if ( exists( $C{GRUB_EMU_CONMODE}) && !exists( $C{GRUB_CONMODE}) ) {
+  # pick up 'conmode=' from CMDLINE
+  my $found = "";
+  foreach ( "GRUB_CMDLINE_LINUX", "GRUB_CMDLINE_LINUX_DEFAULT" ) {
+    next unless ($C{$_} =~ m{ ?conmode=(\S+) ?});
+    $C{GRUB_CONMODE} = $1;
+    last;
+  }
+  if ( !exists( $C{GRUB_CONMODE}) && $C{GRUB_EMU_CONMODE} eq "3270" ) {
+    # force GRUB_CONMODE to 3215 for least surprise
+    $C{GRUB_CONMODE}="3215";
+  }
+}
+if ( exists( $C{GRUB_EMU_CONMODE}) && exists( $C{GRUB_CONMODE})) {
+  # strip "conmode=" from GRUB_CMDLINE{,_LINUX}_DEFAULT
+  foreach ( "GRUB_CMDLINE_LINUX", "GRUB_CMDLINE_LINUX_DEFAULT" ) {
+    $C{$_} =~ s{( ?)conmode=\S+ ?}{$1}g;
+  }
+}
+foreach ("GRUB_EMU_CONMODE", "GRUB_CONMODE") {
+  next unless( exists( $C{$_}) );
+  $C{$_} = "conmode=" . $C{$_};
+}
+
+if ( $debug && $verbose > 2 ) {
+  foreach ( sort( keys( %C)) ) {
+    printf( "%s=\"%s\"\n", $_, $C{$_});
+  }
+}
+
+open( IN, "< $in") ||
+   Panic( 1, "$C: Failed to open 'zipl.conf' template: $!.\n");
+while ( <IN> ) {
+  Info( 3, "$.. <$_$.. >");
+  if ( $. == 1 && m{^## This} ) {
+    $_ = "## This file was written by 'grub2-install/$C'\n" .
+	 "## filling '$in' as template\n";
+  } elsif ( $. == 2 && m{^## rpm's} ) {
+    $_ = "## with values from '$default'.\n" .
+	 "## In-place modifications will eventually go missing!\n";
+  }
+  while ( m{\@([^\@\s]+)\@} ) {
+    my $k = $1;
+    my $v;
+    if ( exists( $C{$k}) ) {
+      $v = $C{$k};
+    } elsif ( exists( $Mandatory{$k}) ) {
+      $v =  "$k";
+      $miss++;
+    } else {
+      $v = "";
+    }
+    s{\@$k\@}{$v}g;
+  }
+  Info( 2, $_);
+  $cfg .= $_;
+}
+if ( $miss ) {
+  Info( 1, "Partially filled config:\n===\n$cfg===\n");
+  Panic( 1, "$C: 'zipl.conf' template could not be filled. \n");
+}
+
+my $ziplconf = "$zipldir/config";
+if ( ! $debug ) {
+  open( OUT, "> $ziplconf") || die;
+  print( OUT $cfg) || die;
+  close( OUT);
+}
+
+# copy out kernel and initrd
+my $defimage = "/boot/image";
+my $definitrd = "/boot/initrd";
+my $ziplimage = "$zipldir/image";
+my $ziplinitrd = "$zipldir/initrd";
+my $Image = "$defimage";
+
+if ( ! $running && ! $force ) {
+  chomp( $running = qx{uname -r});
+  Info( 1, "preferred kernel: '$running'\n");
+  $Image .= "-$running";
+}
+if ( ! -r $Image ) {
+  $Image = $defimage;
+}
+Panic( 1, "$C: kernel '$Image' not readable!?\n") unless (-r $Image);
+
+if ( -l $Image ) {
+  $Image = readlink( $Image);
+}
+my ($image, $version) = ($Image =~ m{^(?:/boot/)?([^-]+-(.+))$});
+my $initrd = "initrd-$version";
+
+if ( !defined($image) || !defined($version) || ! -r "/boot/$image" ) {
+  Panic( 1, "$C: weird $Image. This should never happen!\n");
+}
+
+if ( ! -r $ziplimage || ! -r $ziplinitrd || $refresh ) {
+  BootCopy( $image, $zipldir, "image");
+  BootCopy( $initrd, $zipldir, "initrd") if (-r "/boot/$initrd");
+}
+if ( $refresh || ChkInitrd( $zipldir, "initrd") <= 0 ) {
+  MkInitrd( $initrd, $zipldir, $version);
+}
+if ( ChkInitrd( $zipldir, "initrd") == 0 ) {
+  Info( 0, "$C: dracut does not work as expected! Help needed!\n");
+  $miss++;
+}
+
+# now: go for it!
+my @C = ( "/sbin/zipl", (($verbose) ? "-Vnc" : "-nc"), "$ziplconf" );
+System( @C);
+exit( $miss);
+
--- /dev/null
+++ b/util/s390x/dracut-zipl-refresh.sh.in
@@ -0,0 +1,183 @@
+#!/bin/bash
+# ex: ts=8 sw=4 sts=4 et filetype=sh syntax=off
+
+debug=false
+TIMEOUT=300
+[ -n "$SYSROOT" ] ||
+SYSROOT=/sysroot
+[ -d $SYSROOT/boot ] || SYSROOT=
+
+sync()		{ $SYSROOT/usr/bin/sync "$@"; }
+readlink()	{ $SYSROOT/usr/bin/readlink "$@"; }
+newline()	{ echo ""; }
+verbose() {
+  local a
+  local m
+  [ -n "$*" ] || return 0
+  m="+"
+  for a in "$@"; do
+    case "$a" in
+      (*"	"*|*" "*|"") m="$m '$a'";;
+      (*)     m="$m $a";;
+    esac
+  done
+  echo "$m"
+  [ -n "$SYSROOT" -o "$1" = "chroot" ] || return 0
+  "$@"
+}
+
+SYSK="$(readlink $SYSROOT/boot/image)"
+SYSK="${SYSK#image-}"
+ZIPK="$(readlink $SYSROOT/boot/zipl/image)"
+ZIPK="${ZIPK#image-}"
+PRVK="$(readlink $SYSROOT/boot/zipl/image.prev 2> /dev/null)"
+PRVK="${PRVK#image-}"
+RUNK="$(uname -r)"
+# if /boot/zipl is not accessible ZIPK will be empty, assume running kernel
+[ -n "$ZIPK" ] || ZIPK="$RUNK"
+
+[ -n "$SYSROOT" ] || {
+  echo "$0 is not intended for interactive use!"
+  $debug ||
+  exit 0
+  ## test:
+  TIMEOUT=6
+  RUNK=110; ZIPK=110; PRVK=101; SYSK=194
+  ##RUNK=$PRVK; ZIPK=$SYSK # previous booted, newest is default
+  ##t=$ZIPK; ZIPK=$PRVK; PRVK=$t; SYSK=$PRVK  # unknown booted
+  ##ZIPK=$SYSK; PRVK="" # no update
+  ##ZIPK=$SYSK # try previous
+  echo "R=$RUNK S=$SYSK Z=$ZIPK P=$PRVK"
+  #verbose echo "a b" z
+  #verbose echo "^h	^j" ^z
+}
+
+trap newline EXIT
+
+echo -n "
+  Attention: 'grub2' failed to start the target kernel"
+
+if [ "$ZIPK" != "$RUNK" -a "$RUNK" != "$SYSK" ]; then
+  # i.e. "previous" has been selected via zipl, but it fails!?
+  [ "$RUNK" = "$PRVK" ] &&
+  echo " from previous" ||
+  echo " from unknown"
+
+  echo "  ZIPL kernel ($RUNK).  If default ($ZIPK)
+  fails as well, please contact support."
+  exit 1
+fi
+echo "."
+if [ "$ZIPK" = "$SYSK" ]; then
+  [ -z "$PRVK" ] &&
+  echo "
+  No kernel update readily available/installed.  Please contact support." ||
+  echo "
+  You may want to try the previous kernel ($PRVK) with
+  'IPL ... LOADPARM 4', as no update kernel is readily available/installed."
+  exit 1
+fi
+
+echo "
+  A newer kernel ($SYSK) is available and will be deployed
+  in $TIMEOUT seconds.  To facilitate this, the affected file-systems have
+  to be made writable, then 'grub2-install --force' needs to be run,
+  and, on success, a 'reboot' will be initiated.
+
+  Press 'c[Enter]' to interrupt, any other input will proceed... "
+
+trap interrupted=1 INT
+interrupted=0
+input=""
+read -t $TIMEOUT input
+case "$input" in
+  ([Cc]) interrupted=2 ;;
+esac
+if [ $interrupted != 0 ]; then
+  echo "
+  Automatic update cancelled..."
+  exit 1
+fi
+trap - INT
+echo "
+  Attempting automatic update..."
+
+ismounted() {
+  local mode="$1"
+  local tgt="$2"
+  local dev mp fs opts dc
+  while read dev mp fs opts dc; do
+    [ "$mp" = "$tgt" ] || continue
+    case ",$opts," in
+      (*,$mode,*) return 0;;
+    esac
+  done < /proc/mounts
+  return 1
+}
+ismp() {
+  local sysr="$1"
+  local tgt="$2"
+  local dev mp fs opts dc
+  while read dev mp fs opts dc; do
+    case "$dev" in
+      ("#"*) continue;;
+    esac
+    [ "$mp" = "$tgt" ] || continue
+    return 0
+  done < $sysr/etc/fstab
+  return 1
+}
+chroot() {
+  local tgt="$1"; shift
+  if [ -z "$tgt" ]; then
+    echo -n "+"
+    verbose "$@"
+  else
+    /usr/bin/chroot "$tgt" "$@"
+  fi
+}
+cleanup() {
+  local mp
+  echo "  # cleanup"
+  for mp in $UMOUNT; do
+    verbose chroot "$SYSROOT" umount $mp
+  done
+  for mp in $WMOUNT; do
+    verbose mount -o remount,ro $mp
+  done
+  sync; sync
+  [ -z "$EXIT" ] || echo "$EXIT"
+  echo ""
+}
+trap cleanup EXIT
+UMOUNT=""
+WMOUNT=""
+EXIT=""
+
+echo "  # prepare"
+# remount $SYSROOT{,/boot{,/zipl}} read-write
+for mp in {"",/boot{,/zipl}}; do
+  [ -n "$SYSROOT$mp" ] || continue
+  if ismounted rw $SYSROOT$mp; then
+     echo "  # $mp: already read-write: ignore"
+  elif ismounted ro $SYSROOT$mp; then
+    verbose mount -o remount,rw $SYSROOT$mp
+    WMOUNT="$SYSROOT$mp $WMOUNT"
+  elif ismp "$SYSROOT" $mp; then
+    verbose chroot "$SYSROOT" mount -w $mp || exit 1
+    UMOUNT="$mp $UMOUNT"
+  fi
+done
+if [ ! -w $SYSROOT/boot/zipl/config ]; then
+  EXIT="ERROR: $SYSROOT/boot/zipl/config not writable!  Aborting..."
+  exit 1
+fi
+echo "  # action"
+verbose chroot "$SYSROOT" grub2-zipl-setup --force
+ret=$?
+if [ $ret != 0 ]; then
+  EXIT="  # failed ($ret)"
+else
+  EXIT="  # done"
+fi
+exit $ret

Places

File grub2-s390x-04-grub2-install.patch of Package grub2 (Revision 1118b91bcdfc883918ad107221d1d2c4)

Places