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

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


    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

    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.


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