linux-kernel - Re: [PATCH] ARM: spectre-v2: remove Brahma-B53 from hardening

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Date:   Sun, 10 Nov 2019 19:33:09 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     bcm-kernel-feedback-list@...adcom.com, catalin.marinas@....com,
        will@...nel.org, Doug Berger <opendmb@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: spectre-v2: remove Brahma-B53 from hardening



On 10/31/2019 3:00 PM, Florian Fainelli wrote:
> From: Doug Berger <opendmb@...il.com>
> 
> When the default processor handling was added to the function
> cpu_v7_spectre_init() it only excluded other ARM implemented processor
> cores. The Broadcom Brahma B53 core is not implemented by ARM so it
> ended up falling through into the set of processors that attempt to use
> the ARM_SMCCC_ARCH_WORKAROUND_1 service to harden the branch predictor.
> 
> Since this workaround is not necessary for the Brahma-B53 this commit
> explicitly checks for it and prevents it from applying a branch
> predictor hardening workaround.
> 
> Fixes: 10115105cb3a ("ARM: spectre-v2: add firmware based hardening")
> Signed-off-by: Doug Berger <opendmb@...il.com>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Submitted:

https://www.armlinux.org.uk/developer/patches/viewpatch.php?id=8937/1
-- 
Florian