Re: [RFC PATCH 8/8] Use Linux's PAT

[Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>]

On Tue, Dec 06, 2022 at 11:38:03AM +0000, Andrew Cooper wrote:
> On 06/12/2022 04:33, Demi Marie Obenour wrote:
> > This is purely for testing, to see if it works around a bug in i915.  It
> > is not intended to be merged.
> >
> > NOT-signed-off-by: DO NOT MERGE
> 
> Following up on Marek's report on IRC/Matrix, you're saying that this
> change does actually fix screen corruption issues on AlderLake, and
> something on TigerLake too?

Correct

> If that is actually the case, then one of two things is happening.  Either,
> 
> 1) Drivers in Linux are bypassing the regular caching APIs, or

This would not surprise me at all.

> 2) The translation logic between Linux's idea of cacheability and Xen's
> PAT values is buggy.

How could I check for this?
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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