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

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Can't get Dom0 PV_OPS working properly
From: Ian Murray <murrayie@xxxxxxxxxxx>
Date: Thu, 13 Jan 2011 11:01:41 +0000 (GMT)
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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 

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 

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 


* 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,


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