Xen 4.3.2 -- nvidia binary driver possible

[Georg Bege <therion@ninth-art.de>]

Hello

I'd like to ask about the possible using of the nvidia binary driver,
along with Xen on Dom0.
It's obvious not working, there are a few hits on Google regarding this,
most are however outdated.
I didn't find a clear answer if this is possible to fix or not.

I can remember that I once had this setup in an older system,
maybe something like Linux 2.6 and much older binary driver.
There was the famous "IGNORE_XEN_PRESENCE" flag - these information
seems to be outdated.
The driver compiles fine, but if I want to startx:

-----------------------------------------snip---------------------------------
...
[   208.771] (II) NVIDIA(0): Validated MetaModes:
[   208.771] (II) NVIDIA(0):     "DFP-0:1280x1024,DFP-2:1280x1024"
[   208.771] (II) NVIDIA(0): Virtual screen size determined to be 2560 x
1024
[   208.793] (--) NVIDIA(0): DPI set to (85, 83); computed from
"UseEdidDpi" X config
[   208.793] (--) NVIDIA(0):     option
[   208.793] (**) NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
[   208.793] (--) Depth 24 pixmap format is 32 bpp
[   208.794] (II) NVIDIA: Using 3072.00 MB of virtual memory for
indirect memory
[   208.794] (II) NVIDIA:     access.
[   208.803] (II) NVIDIA(0): Setting mode "DFP-0:1280x1024,DFP-2:1280x1024"
[   208.930] (EE) NVIDIA(0): Failed to allocate sofware rendering cache
surface: out of
[   208.930] (EE) NVIDIA(0):     memory.
[   208.930] (EE) NVIDIA(0):  *** Aborting ***
[   208.971] (EE)
Fatal server error:
-----------------------------------------snip---------------------------------

My system is Gentoo Linux 3.12.21 (64bit), the nvidia driver is of
337.25 revision.
I found an older hit which similar error message, however it was from
2010 and ppl did workaround by adding nopat along with the kernel -
obviously on an 32bit host system.

Maybe this is an old tale, was asked a couple of times already - as said
I couldnt really discover a clear answer about this.

regards,
Georg