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Wed, 15 Jul 2026 12:29:15 +0000 Date: Wed, 15 Jul 2026 13:29:15 +0100 Message-ID: <86a4rso2qs.wl-maz@kernel.org> From: Marc Zyngier To: D Scott Phillips Cc: Oliver Upton , Catalin Marinas , Will Deacon , Jonathan Corbet , Shuah Khan , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Mark Rutland , Zeng Heng , Wei Xu , Vladimir Murzin , Lucas Wei , Kuninori Morimoto , Sascha Bischoff , Yicong Yang , Yeoreum Yun , 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 In-Reply-To: <86jyqx189z.fsf@scott-ph-mail.amperecomputing.com> References: <20260710222128.416581-1-scott@os.amperecomputing.com> <87mrvy5640.wl-maz@kernel.org> <86jyqx189z.fsf@scott-ph-mail.amperecomputing.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: scott@os.amperecomputing.com, oupton@kernel.org, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, mark.rutland@arm.com, zengheng4@huawei.com, xuwei5@hisilicon.com, vladimir.murzin@arm.com, lucaswei@google.com, kuninori.morimoto.gx@renesas.com, Sascha.Bischoff@arm.com, yangyicong@hisilicon.com, yeoreum.yun@arm.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 15 Jul 2026 00:06:00 +0100, D Scott Phillips 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. Thanks, M. -- Without deviation from the norm, progress is not possible.