Re: [Xen-devel] GTX 760 passed through

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Dec 02, 2013 at 06:36:48PM +0100, Nvidia Reverse wrote:
> The nvlddmkm.sys needs to be patched removing the whitelist for the device
> ids allowed to be virtualized.
> But the interesting part is how NVIDIA detects that the GPU is
> virtualized...

Interesting. I was thinking that the BIOS/firmware would run itself
in the virtualized or non-virtualized code depending on the device id.
But you seem to imply that it is all in the OS driver code.

At which point the idea of just modifying in QEMU the PCI device ID
to be different would .. well, make it possible to do a lot of
neat stuff as Gordan pointed out.

In terms of legal issues of patching up a windows kernel driver and
showing other folks how to do it?

No idea. Presumarily there is some license thing that you had agreed
when you installed the Nvidia driver - check to see what it says.

> 
> 
> On Mon, Dec 2, 2013 at 5:12 PM, Gordan Bobic <gordan@xxxxxxxxxx> wrote:
> 
> > On Mon, 2 Dec 2013 13:18:22 +0100, Nvidia Reverse <aidivnreverse@xxxxxxxxx>
> > wrote:
> >
> >> Hello,
> >> I've successfully passed a unmodified GTX 760 to Win7 x64. It involved
> >> some driver patching on the client side but I'm close to getting the
> >> required steps on the server side, too. Are there any legal issues
> >> that might arise from releasing a patch?
> >>
> >
> > Considering we have everything up to and including a Titan/780 easily
> > modifiable into Quadros/Teslas/Grids to make them work? :)
> >
> > I for one would welcome not having to break out my soldering iron.
> >
> > When you say driver patching, what are we talking about? Unless
> > something changed very recently, just modifying the .inf file
> > isn't sufficient (unless your server-side patch does some
> > device ID faking - which it probably doesn't since the card
> > is still showing up as a 780 in domU).
> >
> > Gordan
> >

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