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[Xen-devel] Fwd: Re: Xen 4.3 / 4.4 - concurrent APIs, VGA Passthru

  • To: xen-devel@xxxxxxxxxxxxx
  • From: Georg Bege <therion@xxxxxxxxxxxx>
  • Date: Mon, 28 Jul 2014 16:10:11 +0200
  • Delivery-date: Mon, 28 Jul 2014 14:11:03 +0000
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Im forwading my email, to the mailing list again -
maybe someone else has something to contribute to my problem.

Nobody else would know better, except the developers themselfs. ;)

-------- Original-Nachricht --------
Betreff:        Re: [Xen-devel] Xen 4.3 / 4.4 - concurrent APIs, VGA Passthru
Datum:  Mon, 28 Jul 2014 05:14:22 +0200
Von:    Georg Bege <therion@xxxxxxxxxxxx>
Antwort an:     therion@xxxxxxxxxxxx
An:     jacek burghardt <jaceksburghardt@xxxxxxxxx>


Thanks for your response, I can imagine hundred of people asked the same
questions already -
but as said it was hard to get an up to date documentation about this.
However I did experiment more with it, my graphics card is an GeForce
I came to the conclusion that passthru works great with XP (both 32bit
and 64bit) but giving me issue's whenever Im trying on Windows 7 64bit.

It seems that vga passthru doesnt work for the newer qemu-xen model
(using Qemu 2.0.0), so Im using
qemu-xen-traditional along with the old bundled qemu-dm which works fine
for XP.

I'll attach my hvm config Im using right now - I'll basically use it for
both XP and Win7.
I've also a different HVM for other HVM's where I rather use qemu 2.0.0
and Spice, but this is a different topic (nothing todo with VGA Passthru).
Basically Im on Gentoo and using Xen 4.4.0-r7, but changed the xen-tools
ebuild slightly as it would not build the traditional qemu by default.

So any idea why this is not working right for Win7?
Win7 also seems to be a lot slower with qemu-xen-traditional, is that a
bug in the old model?


Am 28.07.2014 04:47, schrieb jacek burghardt:
> Well we all pass our video cards as secondary display.  *gfx_passtru
> does not work. What video card do you have ?*

Attachment: Win7gaming.hvm
Description: Text document

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