Re: [Xen-users] [Xen-devel] VGA passthough still not working

[Tobias Geiger <tobias.geiger@xxxxxxxxx>]

Am Dienstag, 24. Januar 2012, 15:12:40 schrieb djmagee@xxxxxxxxxxxx:
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> > bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Konrad Rzeszutek Wilk
> > Sent: Monday, January 23, 2012 8:50 PM
> > To: Tobias Geiger
> > Cc: Sandi Romih; chris; xen-devel@xxxxxxxxxxxxxxxxxxx; xen-
> > users@xxxxxxxxxxxxxxxxxxx; Ian Campbell
> > Subject: Re: [Xen-devel] [Xen-users] VGA passthough still not working
> > 
> > On Mon, Jan 23, 2012 at 02:17:42PM +0100, Tobias Geiger wrote:
> > > Hello!
> > > 
> > > The thing is, you either dont need patches at all to get it to work
> > 
> > (ATI), or
> > 
> > > you need to customize patches reflecting your individual setup
> > 
> > (NVIDIA);
> > 
> > > To be more specific:
> > > I can confirm that passing through a ATI Card works "out of the box"
> > 
> > - either
> > 
> > > to Windows 7 or Windows XP;
> > > In the past i had a setup running with a NVIDIA card, it only worked
> > 
> > with
> > 
> > > special patches (the ones David packed together and offers as
> > 
> > tarball) and - as
> > 
> > > far as i can tell - are not generaly working for all NVIDIA Cards,
> > 
> > i.e. you
> > 
> > > have to adjust Memory-Adresses in the acpi.dst (iirc). - and even
> > 
> > then the
> > 
> > > passed through Card worked only with Windows XP - NOT with Windows
> 
> 7;
> 
> > > Both setup have the "flaw" that they only work once - meaning you
> > 
> > can't reboot
> > 
> > > your DomU , cause after the reboot the passed-through Card doesnt
> > 
> > have correct
> > 
> > > 3D-Accelleration any more (was/is the case with NVIDIA and ATI,
> > 
> > Windows XP and
> > 
> > > Windows7 )
> > 
> > For me it was with ATI with Windows7. Hadn't tried other OSes.
> > 
> > Anybody had luck with passing the card more than once to a guest? With
> > any random set of patches?
> 

I was a bit un-percice regarding the "reboot" issue:

The passing-through itself works even after a reboot of DomU - the rebooted 
System spits out its Graphics normaly through the passed-through Card (NVIDA 
or ATI doesnt matter here) ; BUT:
After a reboot it doesn't work properly. Meaning: Slow 3d Performance, i.e. 
unsable for real 3d apps, even a 3d Desktop;
For example, when the Card gives you 70fps in a Benchmark after a fresh Cold 
Boot, it only gives you 5-10fps after a reboot, this will be that low until 
you reboot Dom0 also, not only DomU;

hopefully i described the scenario better now...


> Yes, I've had a machine running for a couple of weeks, hosting a Windows
> 7 domu with a passed-through Radeon 4770.  I've rebooted the virtual
> machine multiple times, as well as gone through a couple of xl
> destroy/create cycles.
> 
> I only pass it through as a secondary card, as I have the IGD as the
> primary on the host.  The machine is a DQ67SW with a Core i5.  This is
> running xen-unstable (c/s 24465) on a 3.2.1 dom0, with no extra patches.
> 
> I haven't, however, had any luck passing through the IGD to anything
> other than a Windows XP, and that includes running the latest qemu-xen
> with Jean's patches (opregion, host bridge config space mapping).  I've
> been intending to start a separate thread for that...


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