Re: [PATCH stable 4.9] arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field

[Greg KH]

On Fri, Jan 24, 2020 at 12:08:20PM -0800, Florian Fainelli wrote:
> From: Will Deacon <will.deacon@xxxxxxx>
> 
> commit 2a355ec25729053bb9a1a89b6c1d1cdd6c3b3fb1 upstream.
> 
> While the CSV3 field of the ID_AA64_PFR0 CPU ID register can be checked
> to see if a CPU is susceptible to Meltdown and therefore requires kpti
> to be enabled, existing CPUs do not implement this field.
> 
> We therefore whitelist all unaffected Cortex-A CPUs that do not implement
> the CSV3 field.
> 
> Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
> [florian: adjust whilelist location and table to stable-4.9.y]
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>

Thanks for the backport, now applied.

greg k-h