Re: [PATCH v5 05/16] x86/cpu: Defer CR pinning setup until after EFI initialization

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On Tue, Oct 29, 2024 at 11:18:29PM +0000, Luck, Tony wrote:
> >> Yeah, I was talking about 64-bit only.  On 32-bit PAE a PGD maps 1/4 of
> >> the address space which is totally unworkable for stealing.
> >
> > But it is also not necessary.
> 
> So maybe we could make the 64-bit version of use_temporary_mm()
> use some reserved address mapping to a reserved PGD in the upper
> half of address space, and the 32-bit version continue to use "user"
> addresses. It's unclear to me whether adding complexity here would be
> worth it to remove the 64-bit STAC/CLAC text patching issues.

Redesigning use_temporary_mm() is an interesting experiment, but it is
out of scope for the series.

LASS blocks LAM enabling. It would be nice to get LAM re-enabled soonish.

Maybe we can look at use_temporary_mm() again after LASS gets upstream?

-- 
  Kiryl Shutsemau / Kirill A. Shutemov




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