Re: [Xen-devel] [PATCH] Fix Vista screen clear on AMD

[Gary Grebus <ggrebus@xxxxxxxxxxxxxxx>]

On Thu, 2007-10-25 at 12:34 +0100, Tim Deegan wrote:
> At 07:25 -0400 on 25 Oct (1193297134), Ben Guthro wrote:
> > hmm,
> > 
> > Its certainly possiible that I ported this incorrectly to unstable. I 
> > have attached the original patch that applies to 3.1.1 for your review. 
> 
> Yep, that's it; there is no equivalent of v->arch.paging.translate_enabled
> in -unstable any more since I got rid of the shadowing of the p2m and
> the idea of vcpus that don't need p2m translation.

OK... sounds like this isn't needed for unstable.

The symptom was that the Vista bootloader (in protected mode but not
paging enabled) was taking a VMEXIT for every access to the VGA
framebuffer.  The PCI address region had been mapped in the p2m, but
that change wasn't being reflected to the shadow.  I never tracked down
why this only happened for AMD.

        /gary
--
Gary Grebus, Virtual Iron Software Inc.



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