Re: stable request

[Thomas Backlund <tmb@tmb.nu>]

Den 16.3.2021 kl. 08:37, skrev Ard Biesheuvel:
> Please consider backporting commit
>
> 86ad60a65f29dd862a11c22bb4b5be28d6c5cef1
> crypto: x86/aes-ni-xts - use direct calls to and 4-way stride
>
> to stable. It addresses a rather substantial retpoline-related
> performance regression in the AES-NI XTS code, which is a widely used
> disk encryption algorithm on x86.
>

To get all the nice bits, we added the following in Mageia 5.10 / 5.11
series kerenels (the 2 first is needed to get the third to apply/build
nicely):

applied in this order:

 From 032d049ea0f45b45c21f3f02b542aa18bc6b6428 Mon Sep 17 00:00:00 2001
From: Uros Bizjak <ubizjak@gmail.com>
Date: Fri, 27 Nov 2020 10:44:52 +0100
Subject: [PATCH] crypto: aesni - Use TEST %reg,%reg instead of CMP $0,%reg

 From ddf169a98f01d6fd46295ec0dd4c1d6385be65d4 Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@kernel.org>
Date: Tue, 8 Dec 2020 00:34:02 +0100
Subject: [PATCH] crypto: aesni - implement support for cts(cbc(aes))

 From 86ad60a65f29dd862a11c22bb4b5be28d6c5cef1 Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@kernel.org>
Date: Thu, 31 Dec 2020 17:41:54 +0100
Subject: [PATCH] crypto: x86/aes-ni-xts - use direct calls to and 4-way
stride

 From 2481104fe98d5b016fdd95d649b1235f21e491ba Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@kernel.org>
Date: Thu, 31 Dec 2020 17:41:55 +0100
Subject: [PATCH] crypto: x86/aes-ni-xts - rewrite and drop indirections
via glue helper

--
Thomas