Re: [Xen-users] conversion between Full-virtualization and Para-virtualization

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Nick Couchman wrote:
> There are several things you need to check.  First, I'm going to 
> assume you're running Linux as your guest O/S.  If this is not the 
> case, please respond with the O/S and version you're using.  If you 
> are using Linux, check the following:
> 1) In your guest config file on dom0, you need to switch your disk 
> devices from IDE to xvd*.  So, if you have a line that specifies a 
> local volume as hda in your config file, change this to xvda.  hdb -> 
> xvdb, etc.
> 2) You need to specify the correct root device in your config file for 
> the domU.  This is done with root= in the file.  If your previous root 
> device was hda1, your root line would say root="/dev/xvda1 ro" or 
> something similar.
In theory, you can also use the pygrub boot loader. In practice, I've 
had a bit of trouble with RHEL and Fedora installers getting grub to 
operate in the virtualized environment from the installation CD's rescue 
mode. I've no idea how they did it with anaconda: but you can use the 
approach described above with the para-virtualized kernel installed in 
Dom0 to get it up and running, and run grub inside the operating domain 
to get it to work.
Note that building an initrd in Dom0 for this stunt, or getting grub 
fully configured with an initrd inside the DomU, may take a bit of work 
as well.


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