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Re: [Xen-users] Information Request - domU configuration variables

To: "Norton, Jerry" <jnorton@xxxxxxxxxxx>
Subject: Re: [Xen-users] Information Request - domU configuration variables
From: "Dan VerWeire" <dverweire@xxxxxxxxx>
Date: Tue, 11 Dec 2007 17:26:40 -0500
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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Hi Jerry,

I don't have any links to more information but I can give you a quick answer on your question. You use the /path/hvmloader when you want your domU to run an operating system  that is not Xen aware, such as Windows XP, Windows Server 2003 or a non-paravirtualized linux distro. Pretty much it using the HVMLoader should allow you to install any OS on your computer that you would normally be able to on the bare metal. Your CPU must have virtualization extensions in order for this to work.

The other example you listed "kernel = '/path/vmlinuz-2.6.18-5-xen-686" is for booting a domU that is Xen aware using a linux Kernel or other that was compiled as a Xen guest domain. These types of domUs don't require the virtualization extensions in the CPU as the Kernel can talk to Xen.

At least, this is how I understand it. I am still learning...

I hope this helps.



On Dec 11, 2007 4:56 PM, Norton, Jerry < jnorton@xxxxxxxxxxx> wrote:

Hi all, I'm new to Xen but with trial and error (and a lot of googling) I have a debian host server (dom0) working with a debian guest server (domU).  My big thing I struggled with was trying to get the domU to boot from an .iso or a cd-rom so I can setup different OS's.  Like I said, I managed to get things working but know I'm trying to understand what I did and what changed. 


In my searching I found some people listed their config files with:

kernel = '/path/vmlinuz-2.6.18-5-xen-686

builder = 'linux'


and others with:

                kernel = '/path/hvmloader

builder = 'hvm'

                device_model = '/path/qemu-dm'


My searching only seems to bring up hits of posted configurations.  Does anyone have any links to information explaining the different between these two values and when/why you would use them?  Sorry for the amateur questions.  I'm just trying to get a better handle on everything.



Jerry Norton


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