Re: [Xen-devel] Re: PCI passthrough stopped working, brainache!

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Sat, 2011-10-15 at 12:27 +0100, Andy Burns wrote:
> On 15 October 2011 11:36, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> 
> > I think you've got 8G of RAM so one thing which might be worth trying is
> > to give "mem=2G" (or perhaps 3G) on the hypervisor command line. That
> > ought to rule out addresses which are too high. (just a datapoint, not a
> > solution)
> 
> A coconut for the gentleman!
> 
> Working in dom0 and (with page-alignment of the PCI BARs) in the domU,
> I did check a couple of reboots and a cold start too, just in case!

Excellent. I should read the whole thread before replying.

> So what's to look at for the real cause?

Will have to have a think on Monday.

The VM_IO stuff which Konrad mentioned and perhaps the DMA mask of the
device spring to mind.

Ian.


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