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From: Marc Zyngier <maz@kernel.org>
To: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Steven Price <steven.price@arm.com>
Subject: Re: [PATCH v5 0/3] arm64: Workaround for Cortex-A55 erratum 1530923
Date: Thu, 16 Jan 2020 07:28:49 +0000
Message-ID: <3292551ef07b2c5354d48faedad849ff@kernel.org> (raw)
In-Reply-To: <20200114164543.GD2579@willie-the-truck>

On 2020-01-14 16:45, Will Deacon wrote:
> On Mon, Dec 16, 2019 at 11:56:28AM +0000, Steven Price wrote:
>> Version 5 is a rebasing of version 4 (no changes).
>> 
>> This series enables a workaround for Cortex-A55 erratum 1530923. The
>> erratum potentially allows TLB entries to be allocated as a result of 
>> a
>> speculative AT instruction. This may happen in the middle of a guest
>> world switch while the relevant VMSA configuration is in an 
>> inconsistent
>> state, leading to erroneous content being allocated into TLBs.
>> 
>> There are existing workarounds for similar issues, 1165522 is
>> effectively the same, and 1319367/1319537 is similar but without VHE
>> support.  Rather than add to the selection of errata, the first patch
>> renames 1165522 to WORKAROUND_SPECULATIVE_AT which can be reused (in 
>> the
>> final patch) for 1530923.
>> 
>> The workaround for errata 1319367 and 1319537 although similar cannot
>> use VHE (not available on those CPUs) so cannot share the workaround.
>> However, to keep some sense of symmetry the workaround is renamed to
>> SPECULATIVE_AT_NVHE.
>> 
>> Changes since v4:
>>  * Rebased to v5.5-rc1
> 
> Looks fine to me. Marc, are you ok with me queueing this via arm64 
> (that's
> where the existing workarounds came from), or would you prefer to take 
> them
> via kvm-arm?

Please go ahead and take it (with my ack) via the arm64 tree.

Thanks,

        M.
-- 
Jazz is not dead. It just smells funny...
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Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-16 11:56 Steven Price
2019-12-16 11:56 ` [PATCH v5 1/3] arm64: Rename WORKAROUND_1165522 to SPECULATIVE_AT_VHE Steven Price
2019-12-16 11:56 ` [PATCH v5 2/3] arm64: Rename WORKAROUND_1319367 to SPECULATIVE_AT_NVHE Steven Price
2019-12-16 11:56 ` [PATCH v5 3/3] arm64: Workaround for Cortex-A55 erratum 1530923 Steven Price
2020-01-14 16:45 ` [PATCH v5 0/3] " Will Deacon
2020-01-16  7:28   ` Marc Zyngier [this message]
2020-01-16 10:47     ` Will Deacon

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