Panic on CPU0 : Unable to boot with Xen 4.1 on Fedora 16, manual grub2 config after compiling Xen from source

[Ranjith Krishnan <pkranjithpk@gmail.com>]

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Hello all,

I had asked my question on xen-users list, but I did not get any responses
for 5 days despite bumping the mail up once. Hence forwarding the question
here.

Hello,
Newbie here. So please be patient. If you need any extra information please
ask, and I will try to provide.
My intention is to study xen source and hopefully make some contributions
to it. So I tried to compile Xen 4.1 from source and start using it.

My environment details:
2.0 GHz 32 bit CPU, 2GB RAM with XP and Ubuntu Wubi install. ( Ubuntu
installed as an application within XP, can dual boot)
Trying to install Xen on external USB Hard disk (500 GB) : Installed Fedora
16 on this. Can boot and use Fedora 16 just fine from this.

I found these tutorials after searching and used them.

1. http://wiki.xen.org/wiki/Fedora_13_Xen_4_Tutorial
Used a partition scheme very similar to one mentioned in above tutorial.
Also disabled selinux.

2. Found a second tutorial for building xen from source:
http://wiki.xen.org/wiki/Compiling_Xen

3. I only complied and installed Xen, not linux kernel ( because wiki says
Fedora16 kernel is a valid Xen Dom0 Kernel ) according to
http://wiki.xen.org/wiki/Fedora_16_Dom0

After I installed Xen, confirmed that under /boot I have xen.gz, and the
folder /etc/xen exists.

I modified my grub2.cfg file by looking at a sample grub2 configuration
mentioned at
http://old-list-archives.xen.org/archives/html/xen-changelog/2011-10/msg00151.html

Now when I boot with Xen 4.1, it gives me a Kernel panic and fails to load
the dom0 kernel. Exact error message is

'elf_xen_note_check: ERROR: Will only load images built for the
generic loader or Linux images')

PANIC on CPU0:
Could not setup DOM0 guest OS

I am attaching my grub configuration file. Please have a look and advice.


-- 
Ranjith

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#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Fedora (3.2.7-1.fc16.i686)' --class fedora --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos1)'
	search --no-floppy --fs-uuid --set=root 1c4a75fe-53e2-4320-9500-7111ad74169b
	echo 'Loading Fedora (3.2.7-1.fc16.i686)'
	linux	/vmlinuz-3.2.7-1.fc16.i686 root=/dev/mapper/vg_fedorausb-lvroot ro rd.md=0 rd.dm=0  KEYTABLE=us quiet rd.lvm.lv=vg_fedorausb/lvroot rhgb rd.luks=0 rd.lvm.lv=vg_fedorausb/lvswap SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
	echo 'Loading initial ramdisk ...'
	initrd /initramfs-3.2.7-1.fc16.i686.img
}
menuentry 'Fedora Linux, with Linux 3.1.0-7.fc16.i686' --class fedora --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos1)'
	search --no-floppy --fs-uuid --set=root 1c4a75fe-53e2-4320-9500-7111ad74169b
	echo	'Loading Linux 3.1.0-7.fc16.i686 ...'
	linux	/vmlinuz-3.1.0-7.fc16.i686 root=/dev/mapper/vg_fedorausb-lvroot ro rd.md=0 rd.dm=0  KEYTABLE=us quiet rd.lvm.lv=vg_fedorausb/lvroot rhgb rd.luks=0 rd.lvm.lv=vg_fedorausb/lvswap SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
	echo	'Loading initial ramdisk ...'
	initrd	/initramfs-3.1.0-7.fc16.i686.img
}
menuentry 'Fedora Linux, with Linux 3.1.0-7.fc16.i686 (recovery mode)' --class fedora --class gnu-linux --class gnu --class os {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos1)'
	search --no-floppy --fs-uuid --set=root 1c4a75fe-53e2-4320-9500-7111ad74169b
	echo	'Loading Linux 3.1.0-7.fc16.i686 ...'
	linux	/vmlinuz-3.1.0-7.fc16.i686 root=/dev/mapper/vg_fedorausb-lvroot ro single rd.md=0 rd.dm=0  KEYTABLE=us quiet rd.lvm.lv=vg_fedorausb/lvroot rhgb rd.luks=0 rd.lvm.lv=vg_fedorausb/lvswap SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
	echo	'Loading initial ramdisk ...'
	initrd	/initramfs-3.1.0-7.fc16.i686.img
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
submenu "Xen 4.1" {
menuentry 'Fedora Linux, with Xen 4.1 and Linux 3.2.7-1.fc16.i686' --class fedora --class gnu-linux --class gnu --class os --class xen {
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos1)'
	search --no-floppy --fs-uuid --set=root 1c4a75fe-53e2-4320-9500-7111ad74169b
	echo 'Loading Xen 4.1 ...'
	multiboot       /xen-4.1.gz placeholder
	echo 'Loading Linux 3.2.7-1.fc16.i686 ...'
	module	/vmlinuz-3.2.7-1.fc16.i686 placeholder
	root=/dev/mapper/vg_fedorausb-lvroot ro rd.md=0 rd.dm=0  KEYTABLE=us quiet rd.lvm.lv=vg_fedorausb/lvroot rhgb rd.luks=0 rd.lvm.lv=vg_fedorausb/lvswap SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
	echo 'Loading initial ramdisk ...'
	module /initramfs-3.2.7-1.fc16.i686.img
}
menuentry 'Fedora Linux, with Xen 4.1 and Linux 3.2.7-1.fc16.i686 (recovery mode)' --class fedora --class gnu-linux --class gnu --class os --class xen {
	insmod part_msdos
	insmod ext2
	set root='(hd0,msdos1)'
	search --no-floppy --fs-uuid --set=root 1c4a75fe-53e2-4320-9500-7111ad74169b
	echo 'Loading Xen 4.1 ...'
	multiboot       /xen-4.1.gz placeholder
	echo 'Loading Linux 3.2.7-1.fc16.i686 ...'
	module	/vmlinuz-3.2.7-1.fc16.i686 placeholder
	root=/dev/mapper/vg_fedorausb-lvroot ro single rd.md=0 rd.dm=0  KEYTABLE=us quiet rd.lvm.lv=vg_fedorausb/lvroot rhgb rd.luks=0 rd.lvm.lv=vg_fedorausb/lvswap SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
	echo 'Loading initial ramdisk ...'
	module /initramfs-3.2.7-1.fc16.i686.img
}
}
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Microsoft Windows XP Professional (on /dev/sda1)" --class windows --class os {
	insmod part_msdos
	insmod ntfs
	set root='(/dev/sda,msdos1)'
	search --no-floppy --fs-uuid --set=root 0650458050457807
	drivemap -s (hd0) ${root}
	chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

### BEGIN /etc/grub.d/90_persistent ###
### END /etc/grub.d/90_persistent ###

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