Re: [Xen-users] Xen Reports no IOMMU, but Hardware Supports It

[Philip Wernersbach <pwernersbach@xxxxxxxxxxxxxxxxxxxx>]

Paul,

Thanks for taking the time to help. The host operating system is NetBSD 6.0.  There is one Windows XP guest, and the output of lspci -vvnn is at http://pastebin.com/zPNdnnjK. We are trying to pass through the USB controllers on the machine, which should be PCI addresses 00:14.0, 00:1a.0, and 00:1d.0.

Thanks,

Philip Wernersbach

Software Implementation Division

Jacobs Automation

On Wed, May 15, 2013 at 3:49 AM, Paul Stimpson <paul.stimpson@xxxxxxxxxxxxxxxxx> wrote:

Hi Philip,

I run a consultancy and I'm just working with a name-you-know company to deliver a xenized appliance that uses IOMMU.

We found that getting IOMMU working was one if the more challenging parts of the project.

Please will you tell me what the host operating system is (including the version), how many guests there are, what the guests' operating systems are, what the piece of hardware you are trying to pass is and the output of the command lspci?

Best regards,
Paul.

Philip Wernersbach <pwernersbach@xxxxxxxxxxxxxxxxxxxx> wrote:

Hello Everyone,

My company is in the process of implementing Xen virtualization. We have managed to get Xen up and running, and have worked through all of the kinks in our set up, except for PCI passthrough. PCI passthrough doesn't work, and I suspect it's because Xen is not using the IOMMU in the computer, even though we built the computer with components that support VT-d.

Here are the computer components we used:

Motherboard: Intel BOXDH77DF

CPU: Intel Core i5-2310 (Sandy Bridge - BX80623I52310)

I also booted Xen up with the "iommu=verbose" parameter and ran "xl dmesg" on the computer, and uploaded the output here: http://pastebin.com/rF0kyftt. I tried running Xen with the "iommu=required" flag, and it failed because it said it couldn't use the IOMMU. If someone work with us to figure out why Xen doesn't use the IOMMU, it would be very appreciated.

Thanks.

Philip Wernersbach

Software Implementation Division

Jacobs Automation

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