From: D Scott Phillips <scott@os.amperecomputing.com>
To: Jaikiran Pai <jai.forums2013@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
James Clark <james.clark@linaro.org>,
James Morse <james.morse@arm.com>,
Joey Gouly <joey.gouly@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Marc Zyngier <maz@kernel.org>, Mark Brown <broonie@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Oliver Upton <oliver.upton@linux.dev>,
"Rob Herring (Arm)" <robh@kernel.org>,
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>,
Shiqi Liu <shiqiliu@hust.edu.cn>, Will Deacon <will@kernel.org>,
Yicong Yang <yangyicong@hisilicon.com>,
kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] arm64: errata: Work around AmpereOne's erratum AC04_CPU_23
Date: Mon, 17 Nov 2025 09:17:14 -0800 [thread overview]
Message-ID: <86bjl0o9yd.fsf@scott-ph-mail.amperecomputing.com> (raw)
In-Reply-To: <456bba04-07b7-4c27-96fc-9bf226b12fd9@gmail.com>
Jaikiran Pai <jai.forums2013@gmail.com> writes:
> Hello Scott,
>
> On 14/05/25 12:15 am, D Scott Phillips wrote:
>> On AmpereOne AC04, updates to HCR_EL2 can rarely corrupt simultaneous
>> translations for data addresses initiated by load/store instructions.
>> Only instruction initiated translations are vulnerable, not translations
>> from prefetches for example. A DSB before the store to HCR_EL2 is
>> sufficient to prevent older instructions from hitting the window for
>> corruption, and an ISB after is sufficient to prevent younger
>> instructions from hitting the window for corruption.
>
> I see that this patch enables the workaround only for AmpereOne AC04
> systems. Do you happen to know if the underlying issue for which this
> patch was introduced, impacts (or can impact) AmpereOne AC03 systems too:
Hi Jaikiran, this issue impacts ac04 only, it is not present on ac03.
next prev parent reply other threads:[~2025-11-17 17:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-13 18:45 [PATCH v4] arm64: errata: Work around AmpereOne's erratum AC04_CPU_23 D Scott Phillips
2025-05-19 10:56 ` Catalin Marinas
2025-05-19 11:13 ` Will Deacon
2025-05-19 11:57 ` Marc Zyngier
2025-05-23 14:15 ` Mark Brown
2025-05-23 15:00 ` Marc Zyngier
2025-05-23 15:15 ` Mark Brown
2025-11-16 11:01 ` Jaikiran Pai
2025-11-17 17:17 ` D Scott Phillips [this message]
2025-11-18 1:45 ` Jaikiran Pai
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