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

  • To: "Han, Weidong" <weidong.han@xxxxxxxxx>
  • From: "David Stone" <unclestoner@xxxxxxxxx>
  • Date: Fri, 7 Dec 2007 08:55:59 -0500
  • Cc: Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 07 Dec 2007 05:56:38 -0800
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Thanks for your response.

> > graphics card I'd like to pass through is PCI Express.
> > If so, what PCI devices do I have to hide from Dom0 and pass to my
> > Windows DomU?  Do I need to do this for the "PCI Express Root Port"
> > AND "PCI Express Port 1" PCI devices as well has the graphics card
> > itself?
> 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?


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