linux-kernel - Re: [PATCH v2] arm64: Branch predictor hardening for Cavium ThunderX2

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Date:   Tue, 16 Jan 2018 16:50:38 -0500
From:   Jon Masters <jcm@...masters.org>
To:     Jayachandran C <jnair@...iumnetworks.com>,
        Will Deacon <will.deacon@....com>
Cc:     marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org,
        lorenzo.pieralisi@....com, ard.biesheuvel@...aro.org,
        catalin.marinas@....com, linux-kernel@...r.kernel.org,
        labbott@...hat.com, christoffer.dall@...aro.org
Subject: Re: [PATCH v2] arm64: Branch predictor hardening for Cavium ThunderX2

On 01/09/2018 07:47 AM, Jayachandran C wrote:
> Use PSCI based mitigation for speculative execution attacks targeting
> the branch predictor. The approach is similar to the one used for
> Cortex-A CPUs, but in case of ThunderX2 we add another SMC call to
> test if the firmware supports the capability.
> 
> If the secure firmware has been updated with the mitigation code to
> invalidate the branch target buffer, we use the PSCI version call to
> invoke it.

What's the status of this patch for TX2? Previously you were holding on
the new SMC number, but I think the consensus was to pull this in now?

Jon.

-- 
Computer Architect