On 08.10.2025 13:20, Roger Pau Monné wrote:

On Mon, Sep 29, 2025 at 07:35:53PM -0400, Jason Andryuk wrote:

On 2025-09-25 08:18, Teddy Astie wrote:

Le 25/09/2025 à 12:48, Jan Beulich a écrit :

Along with Zen2 (which doesn't expose ERMS), both families reportedly
suffer from sub-optimal aliasing detection when deciding whether REP MOVSB
can actually be carried out the accelerated way. Therefore we want to
avoid its use in the common case (memset(), copy_page_hot()).

s/memset/memcpy (memset probably uses rep stosb which is not affected IIUC)

Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>

With Teddy's suggested change:

Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>

Acked-by: Roger Pau Monné <roger.pau@citrix.com>

May I ask for a release-ack here, seeing that it alters behavior that went in
close before the freeze?

Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>

~ Oleksii