Re: [Xen-users] Unable to pass device to IOMMU

[Michael Maher <mmaher@xxxxxxxxxx>]

 Hi Todd,

Thanks for getting back to me. The situation is that it works with Xen 
3.3.2 but not with Xen 4.0.1, exactly the same setup and configuration.
I have just seen another post very similar to this too. What I was 
expecting was that there was a subtle config change between the versions 
that I might have missed, but after re-reading the documentation I can't 
see anything.
I was really just wanting to see how the handling of the PCI pass-back 
had changed between the two version, which might push me in the right 
direction to be looking in. Any ideas?

Many Thanks,
Michael



On 23/09/2010 14:23, Todd Deshane wrote:
> Hi Michael,
>
> On Thu, Sep 16, 2010 at 1:44 PM, Michael Maher<mmaher@xxxxxxxxxx>  wrote:
> > Hello,
> >
> >
> >
> > I’m hoping someone may be able to push us in the right direction. I’m trying
> > to get one of our products to work with the current branch of Xen
> > (4.0/4.0.0) but I’m hitting a problem.
> >
> >
> >
> > We are currently using Xen 3.3.2 on a Sun Blade 600 chassis (with x6270
> > blades) this works great.
> >
> >
> >
> > But when we upgrade to Xen 4.0/4.0.1 we get the following message when
> > starting the DomU:
> >
> >                  Device Cannot be passed to IOMMU
> >
> >
> >
> > I understand from the release note that there were some changes made to the
> > IOMMU/pciback pass-through in this release, does anyone have any details as
> > to what might be going wrong?
> >
> >
> >
> > We’re using SLES11/sp1 and I’ve tried with the Novell build and compiled it
> > myself. I also have the latest firmware for the chassis and blade from Sun,
> > all of which show the same problem.
> Can you provide more detailed information? See for example a recent
> post on PCI Passthrough and/or search xen.markmail.org for PCI
> Passthrough and IOMMU.
>
> Did it work before? You are implying that some change made it not
> work. If you have evidence that is the case, the devel list is the
> place to let them know and they can try to walk you through what
> changed and try to solve it that way.
>
> Hope that helps,
> Todd
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