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

["Han, Weidong" <weidong.han@xxxxxxxxx>]

David Stone wrote:
> 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?
> 

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.

Randy (Weidong)

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