On Wed, Jul 10, 2024 at 07:18:36PM +0200, Borislav Petkov wrote:
> On Wed, Jul 10, 2024 at 07:06:39PM +0300, Alexander Shishkin wrote:
> > static void text_poke_memcpy(void *dst, const void *src, size_t len)
> > {
> > - memcpy(dst, src, len);
> > + stac();
> > + __inline_memcpy(dst, src, len);
> > + clac();
>
> I think you need LASS-specific stac()/clac() or an alternative_2 or so. You
> can't cause that perf penalty on !LASS machines.
Hm. Do we have text_poke() in hot path?
Even if we do, I doubt flipping AC flag would make any performance
difference in context of all locking and TLB flushing we do in this
codepath.
--
Kiryl Shutsemau / Kirill A. Shutemov
