[PATCH stable 4.19] arm64: errata: Remove AES hwcap for COMPAT tasks

[Florian Fainelli]

On 10/26/2022 9:49 AM, Greg Kroah-Hartman wrote:
> On Thu, Oct 20, 2022 at 04:01:07PM -0700, Florian Fainelli wrote:
>> From: James Morse <james.morse at arm.com>
>>
>> commit 44b3834b2eed595af07021b1c64e6f9bc396398b upstream
>>
>> Cortex-A57 and Cortex-A72 have an erratum where an interrupt that
>> occurs between a pair of AES instructions in aarch32 mode may corrupt
>> the ELR. The task will subsequently produce the wrong AES result.
>>
>> The AES instructions are part of the cryptographic extensions, which are
>> optional. User-space software will detect the support for these
>> instructions from the hwcaps. If the platform doesn't support these
>> instructions a software implementation should be used.
>>
>> Remove the hwcap bits on affected parts to indicate user-space should
>> not use the AES instructions.
>>
>> Acked-by: Ard Biesheuvel <ardb at kernel.org>
>> Signed-off-by: James Morse <james.morse at arm.com>
>> Link: https://lore.kernel.org/r/20220714161523.279570-3-james.morse@arm.com
>> Signed-off-by: Will Deacon <will at kernel.org>
>> [florian: resolved conflicts in arch/arm64/tools/cpucaps and cpu_errata.c]
>> Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
>> Change-Id: I651a0db2e9d2f304d210ae979ae586e7dcc9744d
> 
> No need for Change-Id: in upstream patches :)

Meh, the perils of working with Gerrit in the same tree.. do you need me 
to resubmit or can you strip those when you apply the patches?
-- 
Florian