Re: [Xen-users] Nvidia Passthrough and PCIe Bridge Hell

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 10/25/2013 07:32 PM, David Sutton wrote:
> On Fri, Oct 25, 2013 at 6:01 AM, Gordan Bobic <gordan@xxxxxxxxxx
> <mailto:gordan@xxxxxxxxxx>> wrote:
>
>     For those of you who have been following the developments
>     surrounding modding Nvidia cards into equivalent
>     Quadro/Grid models for VGA passthrough, I can report that
>     a simplified mod is now available. See this post for
>     details:
>
>     
> http://www.eevblog.com/forum/__chat/hacking-nvidia-cards-__into-their-professional-__counterparts/msg316134/#__msg316134
>     
> <http://www.eevblog.com/forum/chat/hacking-nvidia-cards-into-their-professional-counterparts/msg316134/#msg316134>
>
>     Summary - remove resistor for 3rd device ID nibble,
>     modify 2 bytes in the UEFI strap, and you are good
>     to go.
>
>     This reduces the complexity of the originaly hardware
>     mod by at least 4x, at the expense of a small BIOS
>     mod.
>
>     Unfortunately, since I am already in PCIe bridge hell
>     due to all of my PCIe slots being behind the broken
>     Nvidia NF200 bridges, the extra layers of bridging
>     on a GTX690 make it unworkable with my motherboard,
>     so if anybody is interested in a new, gridified
>     GTX690, drop me an email off-list.
>
> Just reading through this, and some of the other threads on this topic,
> I had a random idea and just wondered if it was feasible; would be
> possible to translate/change the reported PCI Device ID at the
> QEMU/Passthrough layer?
It'd certainly be nice if this were possible. I don't know what it would 
take to write a shim to do this, and the IOMMU might get in the way.
Gordan


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