[Xen-users] Two different versions of Xen on the same Dom0?

["Manfred Haertel, DB3HM" <Manfred.Haertel@xxxxxxxxxxxx>]

I'm trying to have two different versions of Xen on the same computer - 
the stable on provided by my Linux distribution and another one compiled 
by myself.
Three points were relatively easy:

* Start the alternate Xen kernel: Copy it to /boot/ (or even elsewhere) 
and make another entry in grub2 starting this kernel.
* Provider the alternate tools (xl etc.): Compile Xen with

./configure --prefix=/some/odd/dir --enable-rpath

enable-rpath is important for loading the appropriate (alternate) 
libraries, not the libraries from /usr/lib64
* startup script /etc/init.d/xencommons: Avoid Xen from started 
automatically at boot time and provide an alternate xencommons script 
which starts xenstored, qemu etc. from /some/odd/dir . I have to use the 
appropriate startup script according to the loaded hypervisor.
The problem I have now is that the complete Xen backend handling in th 
Dom0 is done by udev (hm, didn't know that before - so another lesson 
learned).
There is a Xen specific rules file on /etc/udev.d/rules, which calls 
scripts from /etc/xen/scripts (and they use the system provided 
xenstore-read etc.), and I have another alternate rules file from the 
alternate Xen version, which should call different scripts from 
/some/odd/dir/etc/xen/scripts .
How to choose between the two cases?

I think the udev rules are loaded very early at startup, but I am no 
expert on udev. How to change them at runtime?
Or, more generally, what's the best strategy to solve this problem?

--
Manfred HÃrtel, DB3HM    mailto:Manfred.Haertel@xxxxxxxxxxxx
                         http://rz-home.de/mhaertel

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