I have serious doubts that those one-year-old patches from Han Weidong of Intel Corp could be applied to Xen 4.0.1-rc6. They could be extremely incompatible since source codes written now would be vastly different to those written one year ago, especially for the Xen hypervisor. Those patches were designed or written in mind for xen-unstable version 3.5. Just one year back then.

Are there no ***CURRENT*** patches for Xen 4.0.1-rc6 to enable secondary graphics adapter VGA passthrough from Intel Corporation?

Let's ask Han Weidong for his opinion on this matter.

At the moment, I think I am just going to try VGA passthrough of the Intel IGD only.

Thank you very much.

Yours sincerely,

Mr. Teo En Ming (Zhang Enming)
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My Open Letter (Plea for Medical Help/Assistance) to World Leaders:-
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On 08/17/2010 12:55 AM, Pasi Kärkkäinen wrote: 
On Tue, Aug 17, 2010 at 12:44:44AM +0800, Mr. Teo En Ming (Zhang Enming) of Singapore wrote:
  
   Dear Pasi,

   I have just finished downloading the latest Xen 4.0.1-rc6 hypervisor and
   also the latest paravirt-ops dom0 Linux kernel 2.6.32.19, at the time of
   this writing.

   I understand that, by default, Xen 4.0.x hypervisor series support VGA
   passthrough of the primary graphics adapter, especially Intel Integrated
   Graphics Device (IGD) if you are using an Intel Desktop Board like me
   (Intel DQ45CB). Hence no additional work/patches are required if you just
   want to passthrough the IGD or primary VGA adapter. But VGA passthrough of
   the secondary graphics adapter, ie. my NVIDIA GeForce 8400 GS PCI Express
   x16 display adapter, is not supported by default. To passthrough the
   secondary graphics adapter to your Windows XP, Windows Vista or Windows 7
   HVM fully virtualized virtual machine, patches are required to load the
   VGA BIOS of the secondary graphics adapter from a file named
   vgabios-pt.bin and also to perform 1:1 vBAR:pBAR mappings.

   I have just finished reading through the following Xen wiki pages:

   [1]http://wiki.xensource.com/xenwiki/XenParavirtOps

   [2]http://wiki.xensource.com/xenwiki/XenVGAPassthrough

   [3]http://lists.xensource.com/archives/html/xen-devel/2009-08/msg01176.html

   [4]http://lists.xensource.com/archives/html/xen-devel/2010-05/msg00441.html

   I am wondering if I can apply the four patches attached in this xen-devel
   mailing list topic
   [5]http://lists.xensource.com/archives/html/xen-devel/2009-08/msg01176.html
   to Xen 4.0.1-rc6?

   I have already used those same set of patches from Han Weidong of Intel
   Corporation between July and November last year (2009) to patch
   xen-unstable 3.5 for my NVIDIA GeForce 8400 GS PCI Express x16 VGA
   adapter. The thing that is troubling me is whether I can used the same set
   of patches to patch Xen 4.0.1-rc6, since the patches are already outdated.
   The patches which had been provided by Han Weidong to me were dated 31st
   August 2009, almost one year ago.

   I am asking if the patches provided here at
   [6]http://lists.xensource.com/archives/html/xen-devel/2009-08/msg01176.html
   are ***COMPATIBLE*** with Xen 4.0.1-rc6 at all? Would the patches cause
   errors to be displayed/generated when applied to Xen 4.0.1-rc6?

   I am looking forward to your reply.

    
I haven't tried those patches.. so you just have to try and see how it goes!

-- Pasi