From: D Scott Phillips <scott@os.amperecomputing.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oupton@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Joey Gouly <joey.gouly@arm.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Mark Rutland <mark.rutland@arm.com>,
Zeng Heng <zengheng4@huawei.com>, Wei Xu <xuwei5@hisilicon.com>,
Vladimir Murzin <vladimir.murzin@arm.com>,
Lucas Wei <lucaswei@google.com>,
Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
Sascha Bischoff <Sascha.Bischoff@arm.com>,
Yicong Yang <yangyicong@hisilicon.com>,
Yeoreum Yun <yeoreum.yun@arm.com>,
linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev
Subject: Re: [PATCH] arm64: errata: Mitigate AmpereOne erratum AC03_CPU_57 and AC04_CPU_29
Date: Wed, 15 Jul 2026 06:55:08 -0700 [thread overview]
Message-ID: <86h5m01hoj.fsf@scott-ph-mail.amperecomputing.com> (raw)
In-Reply-To: <86a4rso2qs.wl-maz@kernel.org>
Marc Zyngier <maz@kernel.org> writes:
> On Wed, 15 Jul 2026 00:06:00 +0100,
> D Scott Phillips <scott@os.amperecomputing.com> wrote:
>>
>> > OK, that's pretty good news. Can I safely assume that your HW doesn't
>> > support VLPIs/VSGIs in any form (no GICv4+)?
>>
>> AmpereOne AC04 does have gicv4.1 with vlpis/vsgis. Those take a
>> different enough path in the core that a deactivation of a pending
>> vlpi/vsgi won't cause the issue. The wording about "physical interrupt"
>> is meant to exclude vlpis/vsgis, sorry that it didn't come out clearly.
>
> Given that the write-up didn't mention direct injection at all, it
> wasn't totally obvious whether this was taken into account or not.
> Might be worth adding to the errata document for clarity.
Yep, makes sense. I'll work on getting that clarification added.
prev parent reply other threads:[~2026-07-15 13:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-10 22:21 [PATCH] arm64: errata: Mitigate AmpereOne erratum AC03_CPU_57 and AC04_CPU_29 D Scott Phillips
2026-07-11 7:37 ` Marc Zyngier
2026-07-14 23:06 ` D Scott Phillips
2026-07-15 12:29 ` Marc Zyngier
2026-07-15 13:55 ` D Scott Phillips [this message]
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