linux-kernel - Re: [PATCH v3 3/3] arm64: Workaround for Cortex-A55 erratum 1530923

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Message-ID: <af9c85ba-4926-7a57-8544-e548b953259e@arm.com>
Date:   Thu, 14 Nov 2019 11:06:44 +0000
From:   Steven Price <steven.price@....com>
To:     Suzuki Kuruppassery Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>
Cc:     Julien Thierry <julien.thierry.kdev@...il.com>,
        James Morse <james.morse@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] arm64: Workaround for Cortex-A55 erratum 1530923

On 14/11/2019 10:27, Suzuki Kuruppassery Poulose wrote:
> On 13/11/2019 17:22, Steven Price wrote:
[...]
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index defb68e45387..d2dd72c19560 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -532,6 +532,19 @@ config ARM64_ERRATUM_1165522
>>           If unsure, say Y.
>>   +config ARM64_ERRATUM_1530923
>> +    bool "Cortex-A55: Speculative AT instruction using out-of-context
>> translation regime could cause subsequent request to generate an
>> incorrect translation"
>> +    default y
>> +    select ARM64_WORKAROUND_SPECULATIVE_AT
> 
> ARM64_WORKAROUND_SPECULATIVE_AT_VHE ?

Thanks for spotting - annoyingly I don't even seem to get a warning from
Kconfig for this. I'll spin a v4 with your R-Bs on the other patches too
(thanks for those too).

Steve