Hi,
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 
line)
* 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,
Ian.
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