Fedora xen - Jan 2007 - Can''t boot RH7.2 fully-virtualized guest

Hi folks,

 

I''m using FC6 (kernel 2.6.19-1.2895.fc6xen), with SELinux disabled.
I''m
running on a Dell D820 laptop with vmx extensions enabled (confirmed by
looking for vmx in /proc/cpuinfo), trying to boot a RH7.2 (uh, yeah,
don''t ask...) fully-virtualized guest.

 

I used virt-manager to successfully install RH7.2 on a disk image.
However when I then try to boot from the image, on the console I see:

 

MXT page nr start=ffffffff len=ffffffff

Ooops! Too many entries in the memory map" 

 

Spewed out a lot of times, followed by some kernel information, ending
up with:

 

"Unable to handle kernel paging request at virtual address ffffffff"

 

This ends in a kernel panic, complaining:

 

"<0> Kernel panic: Attempted to kill the idle task! In idle task -
not
syncing"

 

Here''s my config file:

 

# Automatically generated xen config file

name = "rh72a"

builder = "hvm"

memory = "500"

disk = [ ''file:/home/user/rh72.xen.img,hda,w'', ]

vif = [ ''type=ioemu, mac=00:16:3e:57:24:2a, bridge=xenbr0'', ]

uuid = "c77c61e4-3294-2bc2-7005-92b92d3191d2"

device_model = "/usr/lib/xen/bin/qemu-dm"

kernel = "/usr/lib/xen/boot/hvmloader"

vnc=1

vncunused=1

apic=1

acpi=1

pae=1

 

vcpus=1

serial = "pty" # enable serial console

on_reboot   = ''restart''

on_crash    = ''restart''

 

 

Am I missing something obvious? Any more info I can provide that would
be helpful?

 

Thanks for any help you might offer.

 

-- Dan Hanks

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Hanks, Dan wrote:
> MXT page nr start=ffffffff len=ffffffff
> Ooops! Too many entries in the memory map”
> This ends in a kernel panic, complaining:
> “<0> Kernel panic: Attempted to kill the idle task! In idle task –
not
> syncing”
We ran into the same problem.  The default kernel for RH7.2 is patched
to support "MXT" (automatic compression to/from RAM), and the HVM bios
confuses it.

Upgrade the kernel to one that doesn''t have MXT (such as
kernel-smp-2.4.20-28.7) and you''ll be fine.

There may also be a boot param to tell the kernel to ignore MXT, which
would likely have the same effect.

- -Karl
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