[Xen-users] GRUB stopped working in xen (hvm, qemu-dm)

[Karsten von Hornbostel <perlmeister@xxxxxxxx>]

Hi,

first of all, my name is Karsten and I am fairly new to xen. A former colleague 
of mine has set up a xen dom0 with 4 virtual machines runnig on it. A few 
months 
ago this colleague left the company. Last week our office Building has been hit 
by a lightning wich resulted in an power blackout.

After the power went back again, the system booted and all but one of the 
virtual machines went back. The virtual machine that did not went back seems 
not 
to be able to boot, i see some kind of grub error. The console of this machine 
prints out:

=====
Plex86/Bochs VGABios current-cvs 07 Jun 2008
This VGA/VBE Bios is released under the GNU LGPL
Please visit :
 * http://bochs.soureeferge.net
 * http://www.nongnu.org/vgabios
cirrus-compatible VGA is detected
HVMAssist BIOS, 1 Cpu, $Revision: 1.138 $ $Date: 2005/05/07 15:55:26 $
ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (35840 MBgtes)
ata0 slave: Unknown device
ata1 master: masteri QEMU CD-ROM ATAPI-4 CD-Rom/DVD-Rom
ata1 slave: Unknown device
Booting from Hard Disk...
GRUB GRUB _
=====

After this, the boot process hangs and the vm seems to be verry busy, CPU goes 
up to 100%.

The host system seems to be OpenSuSE 11.0, while the virtual machine is running 
debian 4.0.

The configuration of this virtual machine:

====
erde:/ # cat /etc/xen/vm/VM4
name="VM4"
uuid="67896e91-b77f-edcc-48c8-ef3016821ecd"
memory=512
vcpus=2
on_poweroff="destroy"
on_reboot="restart"
on_crash="destroy"
localtime=0
builder="hvm"
extid=0
device_model="/usr/lib/xen/bin/qemu-dm"
kernel="/usr/lib/xen/boot/hvmloader"
boot="c"
disk=[ 'file:/var/lib/xen/images/VM4/disk0,hda,w', 
'phy:/dev/cdrom,hdc:cdrom,r', 
]
vif=[ 'mac=00:16:3e:62:62:80,model=rtl8139,type=ioemu', ]
stdvga=0
vnc=1
vncunused=1
apic=0
acpi=1
pae=1
serial="pty"
====

I tried to attach the DomU disk image of this machine to Dom0 using xm 
bock-attach and it worked. All files are there, e2fsck did not find any errors.

So my question is, how can i recover this virtual machine? I there a chance to 
re-install grub? What is the meaning of this "GRUB GRUB" printed out by grub?

Thanks in advance,
Karsten

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