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[Xen-users] Nvidia Passthrough and PCIe Bridge Hell

  • To: <xen-users@xxxxxxxxxxxxx>
  • From: Gordan Bobic <gordan@xxxxxxxxxx>
  • Date: Fri, 25 Oct 2013 12:01:18 +0100
  • Delivery-date: Fri, 25 Oct 2013 11:01:56 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

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.


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