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

To: deshantm@xxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Unable to pass device to IOMMU
From: Michael Maher <mmaher@xxxxxxxxxx>
Date: Fri, 24 Sep 2010 17:31:04 +0100
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 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,

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:

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,

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