linux-kernel - Re: [PATCH v6 04/10] arm64: Advertise mitigation of Spectre-v2, or lack thereof

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Date:   Mon, 25 Mar 2019 10:59:34 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     jeremy.linton@....com, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will.deacon@....com, marc.zyngier@....com,
        dave.martin@....com, shankerd@...eaurora.org,
        julien.thierry@....com, mlangsdo@...hat.com, stefan.wahren@....com,
        andre.przywara@....com, linux-kernel@...r.kernel.org,
        stefan.wahren@...e.com
Subject: Re: [PATCH v6 04/10] arm64: Advertise mitigation of Spectre-v2, or
 lack thereof



On 21/03/2019 23:05, Jeremy Linton wrote:
> From: Marc Zyngier <marc.zyngier@....com>
> 
> We currently have a list of CPUs affected by Spectre-v2, for which
> we check that the firmware implements ARCH_WORKAROUND_1. It turns
> out that not all firmwares do implement the required mitigation,
> and that we fail to let the user know about it.
> 
> Instead, let's slightly revamp our checks, and rely on a whitelist
> of cores that are known to be non-vulnerable, and let the user know
> the status of the mitigation in the kernel log.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> [This makes more sense in front of the sysfs patch]
> [Pick pieces of that patch into this and move it earlier]
> Signed-off-by: Jeremy Linton <jeremy.linton@....com>
> Reviewed-by: Andre Przywara <andre.przywara@....com>
> Tested-by: Stefan Wahren <stefan.wahren@...e.com>
> ---

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>