On Tue, Oct 29, 2024 at 11:18:29PM +0000, Luck, Tony wrote:

quoted

quoted

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