Re: [Xen-devel] Using VT-D to grant a Windows DomU access to a PCIExpress graphics card?

["David Stone" <unclestoner@xxxxxxxxx>]

> >> Graphices card is special. Many tricky things need to be done, such
> >> as frame buffer, VGA guest bios, etc. So current VT-d in Xen doesn't
> >> support assigning graphics card yet.
> >
> > I wonder if those complications (which I don't pretend to understand)
> > would go away if the graphics card did not have to produce any output
> > to a locally attached monitor?  My goal is not to render the Windows
> > DomU graphics to the local monitor, but rather to just use the
> > graphics device to do work like rendering to an off-screen buffer.  I
> > can then do whatever I want with that buffer, such as send it over the
> > network to another machine for display.  The Windows DomU would be
> > running completely headless...I can RDP into it to administer it.
> >
> > Would that make it more feasible?
> >
>
> I don't think so. Without those complications, graphics card even can't
> work on guest. I think displaying on local monitor is the same with
> displaying on remote machine in essence.

OK.  I wonder if you could you give me a brief description of these
complications (why they are a problem, and what needs to be done in
the Xen source to handle them)?

Thanks,
Dave

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