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

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Tue, Dec 06, 2022 at 02:47:42PM -0500, Demi Marie Obenour wrote:
> On Tue, Dec 06, 2022 at 07:12:06PM +0100, Marek Marczykowski-Górecki wrote:
> > On Tue, Dec 06, 2022 at 01:01:41PM -0500, Demi Marie Obenour wrote:
> > > On Tue, Dec 06, 2022 at 11:38:03AM +0000, Andrew Cooper wrote:
> > > > 2) The translation logic between Linux's idea of cacheability and Xen's
> > > > PAT values is buggy.
> > > 
> > > How could I check for this?
> > 
> > See Andy's unit test idea on #xendevel:
> > 
> >     as a pretty simple "unit" test in dom0, it might be a good idea to
> >     have a module which watches the PTE in question, and cycles through
> >     various of the memremap_*() APIs and checks the raw PTE that gets
> >     written after Linux and Xen are done fighting with it
> 
> Which PTEs should I check?

The ones adjusted by the memremap_*() call.

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

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