[PATCH RFC 5/5] arm64/speculation: Add support for 'cpu_spec_mitigations=' cmdline options

[Will Deacon]

Hi Josh,

On Thu, Apr 04, 2019 at 11:44:15AM -0500, Josh Poimboeuf wrote:
> Configure arm64 runtime CPU speculation bug mitigations in accordance
> with the 'cpu_spec_mitigations=' cmdline options.  This affects
> Meltdown and Speculative Store Bypass.
> 
> The default behavior is unchanged.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 2 ++
>  arch/arm64/kernel/cpu_errata.c                  | 4 ++++
>  arch/arm64/kernel/cpufeature.c                  | 6 ++++++
>  3 files changed, 12 insertions(+)

Just wanted to make you aware that this is probably going to conflict badly
with some patches we have pending to hook up the sysfs entries:

http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/640326.html

That patch series isn't quite there yet, so I'm expecting a v7, but I think
it will change the shape of this patch quite a lot.

Will