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

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Date:   Tue, 28 Jan 2020 09:08:07 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, will@...nel.org,
        stable@...r.kernel.org, sashal@...nel.org,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH stable 4.9] arm64: kpti: Whitelist Cortex-A CPUs that
 don't implement the CSV3 field

On Fri, Jan 24, 2020 at 12:08:20PM -0800, Florian Fainelli wrote:
> From: Will Deacon <will.deacon@....com>
> 
> 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@....com>
> [florian: adjust whilelist location and table to stable-4.9.y]
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Thanks for the backport, now applied.

greg k-h