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

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

Seems your usage model is feasible.

Randy (Weidong)

David Stone wrote:
> Hmm...why can't I just leave the Cirrus emulated card as it is?  The
> Windows DomU would continue to see it and us it as the primary display
> device.  I've already verified that I can hide the real graphics card
> from Dom0 and this works fine...there is not output from Dom0 or any
> DomU of course, but can connect to DomU via the serial port or ssh,
> and I can connect to Windows DomU via RDP.
> 
> The idea is that the real PCI Express graphics card that is passed
> through to Windows DomU would appear to the Windows OS as a
> _secondary_ display display device.  If one has a bare-metal OS with
> two graphics adapters, I assume only one of them (the "primary") is
> responsible for stuff like the VGA BIOS?   I just want to write
> Direct3D code to cause the physical graphics card to render to an
> _off-screen_ surface...not to a framebuffer.  I could then scrape the
> rendered bitmaps and do whatever I wanted with them.
> 
> Thanks,
> Dave
> 
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