[PATCH v2 2/2] ARM: Remove AES hwcap for parts affected by errata

[Russell King (Oracle)]

On Wed, Apr 13, 2022 at 06:05:45PM +0100, James Morse wrote:
> 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.
> 
> Signed-off-by: James Morse <james.morse at arm.com>

Thanks James. LGTM. In time, can you drop this in the patch system
please? I'm guessing we're only going to have Ard's ack on this.

Thanks.

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