Xen users - Nov 2007 - 64 bit compatibility with phys to virt conversion

Hi all!

I tried to virtualize a physical server (RedHat 3 AS, kernel 2.4, 32 bit) ).
After dd the whole disk, using this conf file

name = "SERVER"
memory = "1024"
disk = [ ''phy:/dev/VMVG/BOG,sda,w'', ]
kernel = "vmlinux-2.4.21-47.0.1.EL.xs0.4.0.25xenU"
ramdisk = "initrd-2.4.21-47.0.1.EL.xs0.4.0.25xenU.img"
vif = [''bridge=xenbr0'' ]
vfb = ["type=vnc,vncunused=1"]
bootloader="/usr/bin/pygrub"
vcpus=1
on_reboot   = ''restart''
on_crash    = ''restart''

I have this error

ERROR: Kernel not a Xen-compatible Elf image.
ERROR: Error constructing guest OS

If my dom0 has a 64 bit kernel, can I boot 32 bit guests?
I think it''s due to 64 bit compatibility.

What do you think?

Thanks,
Marco


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Hi,
As far as i am aware 32bit domU on 64bit dom0 should be possible as of 
Xen 3.1.0 how it has to be setup to work i have no idea hopefully 
someone else can clarify that side of it.

Geoff.

Marco Strullato wrote:
> Hi all!
>
> I tried to virtualize a physical server (RedHat 3 AS, kernel 2.4, 32 
> bit) ). After dd the whole disk, using this conf file
>
> name = "SERVER"
> memory = "1024"
> disk = [ ''phy:/dev/VMVG/BOG,sda,w'', ]
> kernel = "vmlinux-2.4.21-47.0.1.EL.xs0.4.0.25xenU"
> ramdisk = "initrd-2.4.21-47.0.1.EL.xs0.4.0.25xenU.img"
> vif = [''bridge=xenbr0'' ]
> vfb = ["type=vnc,vncunused=1"]
> bootloader="/usr/bin/pygrub"
> vcpus=1
> on_reboot   = ''restart''
> on_crash    = ''restart''
>
> I have this error
>
> ERROR: Kernel not a Xen-compatible Elf image.
> ERROR: Error constructing guest OS
>
> If my dom0 has a 64 bit kernel, can I boot 32 bit guests?
> I think it''s due to 64 bit compatibility.
>
> What do you think?
>
> Thanks,
> Marco
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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> As far as i am aware 32bit domU on 64bit dom0 should be possible as of
> Xen 3.1.0 how it has to be setup to work i have no idea hopefully
> someone else can clarify that side of it.
Yes, it''s possible so long as the 32-bit guest uses PAE.
> > name = "SERVER"
> > memory = "1024"
> > disk = [ ''phy:/dev/VMVG/BOG,sda,w'', ]
> > kernel = "vmlinux-2.4.21-47.0.1.EL.xs0.4.0.25xenU"
> > ramdisk = "initrd-2.4.21-47.0.1.EL.xs0.4.0.25xenU.img"
> > vif = [''bridge=xenbr0'' ]
> > vfb = ["type=vnc,vncunused=1"]
> > bootloader="/usr/bin/pygrub"
> > vcpus=1
> > on_reboot   = ''restart''
> > on_crash    = ''restart''
> >
> > I have this error
> >
> > ERROR: Kernel not a Xen-compatible Elf image.
> > ERROR: Error constructing guest OS
Where did you get the vmlinux and initrd described above from?  Also,
it''s
kinda weird to specify both kernel/ramdisk= and a bootloader=...  Are you 
intending to use those specific kernels from dom0 or are you trying to bot 
via pygrub...

Are there any clues in /var/log/xen/xend.log or /var/log/xen/xend-debug.log?  
I''d guess not, but it might be worth a check ;-)

Finally, if you are using pygrub do check that you''re booting the
*right*
kernel image from your guest.  Start the guest with "xm create -c" so
you get
the console.  When the pygrub screen comes up, make sure you select the 
Xen-aware kernel before booting!

Finally, if you can''t get PV to work, if you have HVM-capable hardware
you
could probably just fully virtualise this machine.

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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