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Re: [Xen-users] Can't get Dom0 PV_OPS working properly

To: Ian Murray <murrayie@xxxxxxxxxxx>
Subject: Re: [Xen-users] Can't get Dom0 PV_OPS working properly
From: Sergey Tovpeko <tsv.devel@xxxxxxxxx>
Date: Thu, 13 Jan 2011 16:14:27 +0300
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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I had a reliable system running Xen 3.4.3 (GitCo) using the CentOS Xen kernel (5.5). I wanted to do some PCI passthrough but I got an issue with MMIO (or similar). Google told me that that I had to use the Xen 2.6.18 or PV_Ops kernel. I downloaded the "Jeremy" PV_OPS kernel and compiled it okay, having followed the Wiki entry instructions (I think!). I read somewhere that I should go to 4.0.1 Xen, which I did. The kernel runs fine as a standalone kernel
and boots under Xen.

I am having the the following issues:-

* I can't get any screen console output (despite console=hvc0 at the dom0 kernel

* PV VM's fail to start properly. As soon as they start, they sit at 100% CPU according to xm top and don't progress. A Windows HVM guest appears to start okay. I haven't tried any other HVM. I have tried PV guests based on CentOS kernel and Ubuntu 10.10 PV_OPS, which do the same.

I tried to look at the various logs but I don't see anything that gives me a clue, but I am not Xen expert to know what I am looking for.

When I revert back to 4.0.1 + CentOS's Xen kernel as Dom0, all VM's start and operate properly.

Any advice is much appreciated.

Thanks in advance,

Hello, Ian!

As I understood correctly your main point is to have the ability to use PCI passthrogh.

It appears to be a problem in Jeremy's pv_ops kernel as Dom0 to run PV domains. I could propose you to try 2.6.18 Dom0 if it only suits for you.


To download it you can use Mercurial tool with
hg clone http://xenbits.xensource.com/linux-2.6.18-xen.hg

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