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

[Ian Murray <murrayie@xxxxxxxxxxx>]

----- Original Message ----
> From: Sergey Tovpeko <tsv.devel@xxxxxxxxx>
> To: Ian Murray <murrayie@xxxxxxxxxxx>
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Sent: Thu, 13 January, 2011 13:14:27
> Subject: Re: [Xen-users] Can't get Dom0 PV_OPS working properly
> 
> 
> > 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.
> >  
> 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.
> 
> http://xenbits.xensource.com/linux-2.6.18-xen.hg
> 
> To download it you  can use Mercurial tool with
> hg clone http://xenbits.xensource.com/linux-2.6.18-xen.hg
> 
>   
> 

Hi, thanks for the response!

I was considering that but I was worried about the drivers being old. The 
server 
works fine with CentOS but I think I am relying on a back-ported driver 
(Forcedeth).

are we saying that there are known issues around running PV VM's and the PV_OPS 
kernel?

Thanks again,

Ian.




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