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

To: Michael Maher <mmaher@xxxxxxxxxx>
Subject: Re: [Xen-users] Unable to pass device to IOMMU
From: Todd Deshane <deshantm@xxxxxxxxx>
Date: Thu, 23 Sep 2010 09:23:24 -0400
Cc: support@xxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
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Reply-to: deshantm@xxxxxxxxx
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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 Deshane

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