From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2929145BD7F; Wed, 15 Jul 2026 12:29:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784118559; cv=none; b=IUpGI4cT3dpZJoDp4SnAQGOunY+X6TErXAZxoQzsXzQInuK/KqDct6jv5VunCL4NugOMQ7goGb9WUHtzUYhUREtCgsBH3HEQ+7lRAUV3eDtV3cN0KUyWJB2aVLaIbDET16qn6neRFMVYdtNp5zQD2eykJWOxYhlN+D6J8MQIrmk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784118559; c=relaxed/simple; bh=QHUFLpB+uxIK07nCZD6CPeNKvXxMo1lKwZ7dlrLZQEc=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=fIL7eIEVGyTDSxpIm/wUIRxvJCZH+Cyx5qqoLbkipVOoTmbssde0kIJse9jcW7l0KfNrXzNABZssvTcO/dRNl9qkxQnj9eWutvo5XfrAejIP6i7iazaUhd0e34wgdf8PmF6AZErp19E1u0G20zRfF8tHgIkyNmgWYNs7rsZb53s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=a7ZSwfgw; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="a7ZSwfgw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1C801F00A3A; Wed, 15 Jul 2026 12:29:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784118557; bh=Tn4O0onV9o21aM12CSR9CJyidbHuGU1mDMe8q6/cLk8=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=a7ZSwfgw0RJsZa4e4EpzpuD8YOKULDOX1UBF5t0kla412TQ2DqLOaOWnrsS5HUqV9 GsnISIbtxmmUbHc70S1hQtBaBPdOJMblKcUEPjYiFz+7iRtPydbC/r2bijSmpg0zMw 7PeY1c+zg/w/3ojN9O/8PZIzQUi1S6tVM1dfdzEatAKJ18UHZKpBXEaYa+VbrBWsJw 8dCuaQUFGHrPbNO1mI4ym7Bg+pzkAhfqEhky3Uwd1APgqkgyrOvfmfjOXFLeQfBNo4 92xmUdNyTl7MqfGAkKP4gE3j4FE0uOrcK+PiqdSFF1JhxCe7jv0qsRLiK5PEEPgIb2 AGh1Q5F1Agdyw== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wjyjj-00000005I6M-2hdf; 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) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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.