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Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in Jeremy's PVOPS K

Dear Pasi,
The strange part is that I _can_ _install_ CentOS 4.7 32-bit guest, but after guest installation completes, the guest won't start using pygrub or pv_grub.
Maybe I am using OpenSuSE 11.1 as Xen Dom 0, whereas the others are using either Fedora or Ubuntu as Dom 0 host, so maybe something is broken/missing along the way.
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) BEng(Hons)(Mechanical Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Singapore 529541
Republic of Singapore
Mobile Phone: +65-9648-9798
MSN: teoenming@xxxxxxxxxxx

-----Original Message-----
From: Pasi Kärkkäinen <pasik@xxxxxx>
To: Teo En Ming <enming.teo@xxxxxxxxxxxxxxx>
Cc: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
Date: Thu, 23 Jul 2009 22:48:43 +0300
Subject: Re: Re[8]: [Xen-devel] Unable to Configure Xen Dom 0 in Jeremy's PVOPS Kernel

On Fri, Jul 24, 2009 at 03:11:36AM +0800, Teo En Ming wrote:
> Hi All,
> I think I may know when my CentOS 4.7 32-bit PV guest can't start. It's the
> PAE kernel issue again.

Xen 3.x supports only PAE domU kernels..

so you need to have kernel-xenU installed, which _should_ be PAE

> After searching through the internet, I came across Pasi's article:
> Title:[CentOS-virt] Tips for installing Fedora 10 32bit Xen PV domU/guest   on
> CentOS 5.3 dom0/host
> URL: http://lists.centos.org/pipermail/centos-virt/2009-March/000901.html
> Apparently, CentOS 4.7 32-bit anaconda installed the xenU (xen-aware)
> kernel. Should I un-install the xenU (xen-aware kernel for
> paravirtualization) and install the PAE kernel for my PV guest instead?
> <QUOTE Pasi Kärkkäinen>
> Xen only supports PAE kernels for 32bit PV guests.

Yep. And those PAE kernels need to be Xen-domU-kernels obviously :)
> </QUOTE>
> But then PAE kernels are not xen-aware, so that means I cannot run my CentOS
> 4.7 32-bit as PV guest? Instead I got to run CentOS 4.7 32-bit as HVM guest?
> Fully virtualized guests are slower than paravirtualized guests.
> Please advise. Thank you!

You definitely need kernel-xenU, and that should work just fine! It should
be PAE automatically.

I'm running CentOS4 guests using kernel-xenU, booted with pygrub.

-- Pasi
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