Xen users - Jan 2008 - PV 32bit domU on 64bit dom0/xen

Hi all,

I'' m having some trouble getting a 32bit domU (converted from a
physical
CentOS 4.6 in this case) running on a 64bit dom0/Xen (Gentoo-based).

domU:

1. When I try to boot using the Xen-enabled CentOS/RHEL Kernel the 
rootfs cannot be mounted (although xenblk is injected into initrd), no 
matter if I try sdaX, hdaX, xvdaX as root.

2. Using the Xen kernel from xen.org "vmlinuz-2.6.18-xen_3.1.0" and
when
compiling a 2.6.20-xen (taken from Gentoo, PAE enabled) kernel myself, 
the system is stuck right after:
"Checking if this processor honours the WP bit even in supervisor 
mode... Ok."
(nothing happens then)

3. When using a vanilla 2.6.23 kernel (configured myself, PAE enabled or 
taken from 
http://lists.xensource.com/archives/html/xen-users/2007-10/msg00378.html) 
I can''t see any kernel messages at all, xm create gives no error
message
but doesn''t do anything (also tried to get the console via hvc0)...



As a last resort I tried the dom0 kernel in domU and it boots up, but 
this is a 64bit kernel (running on 32bit userland in the domU).


Any idea''s?


domU/dom0:

I don''t know if this is related but I''m also having those
nasty "Time
went backwards" messages described in bug #195 
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=195 .



Thanks in advance,
    Christian


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Christian Tramnitz wrote:
> Hi all,
>
> I'' m having some trouble getting a 32bit domU (converted from a 
> physical CentOS 4.6 in this case) running on a 64bit dom0/Xen 
> (Gentoo-based).
>
The easiest way is to use a distro that comes with Xen 3.1 as dom0. In 
my setup I have RHEL 5.1 64bit (Centos should also work). Dom0 has 
xen-3.0.3-41.el5 and kernel-xen-2.6.18-53.1.4.el5 rpm. Don''t let the
rpm
version number fool you, it''s based on xen 3.1 (see output of xm info).
In this setup RHEL 4 32bit works fine with its own kernel-xenU rpm 
(using pygrub).

OpenSolaris domU is another story though. You need some additional 
tweaks for that :)

Regards,

Fajar

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