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

[Tobias Geiger <tobias.geiger@xxxxxxxxx>]

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 )

So - to summarize: It works easiest and most featureful with a ATI Card; 
                            It may work with patches and only with WindowsXP 
with an NVIDIA card

To me it seems that unless someone finds an general approach to runtime-detect 
the NVIDIA-Secific stuff , submitting any patches may be to early, as it 
arouses 
expectations which only in some cases will be met.

That said - i gladly can forward-port these old patches, if you think they are 
helping in any way.

Greetings!
Tobias

Am Montag, 23. Januar 2012, 12:39:38 schrieb Ian Campbell:
> Please do not a) top-post or b) cross-post. The latter being aimed at
> whoever started this thread.
> 
> On Mon, 2012-01-23 at 11:25 +0000, Sandi Romih wrote:
> > Yeah, I guess xen has generally been focused on the server end.
> 
> Xen is focused on whatever people submit patches to do. Many of the core
> developers are not currently looking at VGA passthrough, we have plenty
> of stuff on our plates, but we are more than happy to review and accept
> patches to implement/improve/fix this feature if only those people who
> are interested in it would take the time to submit them per
> http://wiki.xen.org/wiki/SubmittingXenPatches . I'm afraid we are not
> going to go out hunting for patches on the Internet.
> 
> David Techer recently offered to do this but perhaps he would be
> interested in some help from you?
> 
> Ian.
> 
> 
> 
> 
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