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Re: [Xen-devel] IOMMU Domain for Dom0

To: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] IOMMU Domain for Dom0
From: Alex Merritt <merritt.alex@xxxxxxxxx>
Date: Mon, 27 Jun 2011 00:44:46 -0600
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On Mon, Jun 27, 2011 at 00:01, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
> Hello Alex,
> What nvidia cards did you use to succesfully passthrough to a HVM and have 
> CUDA working ?

NVIDIA Tesla ("Fermi") C2070

Using the latest driver available, 270.41.19

Motherboard - Supermicro X8DTG-D

> This could be of interest for others trying to achieve the same ...

HVM pass-through you mean?

I'm unsure how much demand there still is for the toolstack to work in
Dom0, but I can say I'm still pushing.

> --
> Sander
> Monday, June 27, 2011, 5:35:17 AM, you wrote:
>> Hello,
>> I'm looking to enable the NVIDIA CUDA driver/runtime stack to work in
>> Dom0 on Xen. I've contacted NVIDIA through various capacities and have
>> gotten replies essentially saying they cannot provide assistance, and
>> have been following the nvnews.com forums. However, now that I have
>> IOMMU-capable processors (with VT-d) and a version of Xen which can
>> successfully program this hardware, I am interested to determine if it
>> is possible to program the IOMMU *for* Dom0 (i.e. the target is Dom0,
>> not an HVM/pvops guest).
>> I have successfully been able to launch an HVM guest, passing a few
>> GPUs through. Installing an unmodified developer driver from NVIDIA
>> works using the standard method (no SYSSRC=/-OUT= or anything) and
>> CUDA applications execute as expected. Can this be done for Dom0,
>> achieving the same result without requiring any involvement from
>> NVIDIA or modifications to the driver?
>> My immediate interest is more to see if it "can be done" via a hack or
>> something, not necessarily whether it would make sense for Xen to
>> support this in the future. My goal with this email is to get feedback
>> on two fronts: 1) is there a limitation due to the architecture,
>> meaning that as Dom0 is pvops it cannot use VT-d, or is it a
>> implementation addition to Xen that would be needed? 2) If the latter
>> is true (programming needed), how much effort (code/time) would
>> you/anyone estimate it would take to enable this to work, and could
>> you provide some starting pointers for me to do so? I am untrained
>> when it comes to the Xen sourcecode.
>> I'm using Xen 4.1.1 and pv-ops linux (not upstream) on an
>> Intel X5660 with a Tylersburg chipset. My host OS is Fedora 13, but
>> that needn't be static.
>> I originally asked this on xen-users, but was informed this mailing
>> list would be better suited:
>> http://lists.xensource.com/archives/html/xen-users/2011-06/msg00451.html
>> Many thanks in advance!
>> Alex
> --
> Best regards,
>  Sander                            mailto:linux@xxxxxxxxxxxxxx

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