Re: xen and agpgart

[Gerald Britton <gbritton@doomcom.org>]

That was actually my initial attempt.  The first problem I ran into was it
attempting to do a cache flush:

#define flush_agp_cache() asm volatile("wbinvd":::"memory")

Which causes a general protection fault.  Ignoring that for the moment and
then working forward, it allocates a page of memory with __get_free_page()
and attempts to ioremap_nocache() it to presumably generate a completely
uncached page in memory.  This results in a strange oops attempting to
fiddle with the page tables changing the page attributes on that piece
of memory.

My goal at the moment is to have the machine's head running in dom0 (and
on the i830-ish machine I have as a target, this is going to require the
agpgart working to have any reasonable X on it).

				-- Gerald

On Sat, Sep 04, 2004 at 02:11:20AM +0100, Keir Fraser wrote:
> The answer may well be "nothing" if you just want GART/DRI in
> DOM0. Probably those source driectories haven't been enabled in the
> Xen arachitecture for 2.6 - if you can do that then try compiling teh
> drivers and see what happens!
> 
>  -- Keir
> 
> > I've just started toying with xen and noticed the lack of support for
> > agpgart.  It looks like the reasons for this lack have changed between 1.2
> > and 2.0 and It looks like it's a lot closer to working now.  I unfortunately
> > do not have much experience doing VM programming, so my understanding of
> > what's needed may be a little lacking.  I was wondering if someone with a
> > little more knowledge of VM's and Xen than I could comment before I start
> > digging further into it on what work needs to be done in Xen to make
> > agpgart/drm/etc. work in Xen.  Thanks in advance.
> > 
> > 				-- Gerald
> > 
> > 
> > 
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