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From: Florian Fainelli <f.fainelli@gmail.com>
To: Florian Fainelli <f.fainelli@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Cc: Doug Berger <opendmb@gmail.com>,
	catalin.marinas@arm.com, Russell King <linux@armlinux.org.uk>,
	open list <linux-kernel@vger.kernel.org>,
	bcm-kernel-feedback-list@broadcom.com, will@kernel.org,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [PATCH] ARM: spectre-v2: remove Brahma-B53 from hardening
Date: Sun, 10 Nov 2019 19:33:09 -0800
Message-ID: <64597efe-c5f5-4dc2-05c6-bf10f04ec148@gmail.com> (raw)
In-Reply-To: <20191031220053.2720-1-f.fainelli@gmail.com>



On 10/31/2019 3:00 PM, Florian Fainelli wrote:
> From: Doug Berger <opendmb@gmail.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@gmail.com>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Submitted:

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

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-31 22:00 Florian Fainelli
2019-11-11  3:33 ` Florian Fainelli [this message]

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