From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 535B3C433E0 for ; Wed, 17 Mar 2021 14:06:30 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A278764F6A for ; Wed, 17 Mar 2021 14:06:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A278764F6A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; 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Wed, 17 Mar 2021 14:04:46 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lMWmw-003D9U-KI for linux-arm-kernel@lists.infradead.org; Wed, 17 Mar 2021 14:04:44 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 12BC364F69; Wed, 17 Mar 2021 14:04:39 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1lMWmq-002DkG-OQ; Wed, 17 Mar 2021 14:04:36 +0000 Date: Wed, 17 Mar 2021 14:04:36 +0000 Message-ID: <87blbhj2q3.wl-maz@kernel.org> From: Marc Zyngier To: Lorenzo Pieralisi Cc: linux-kernel@vger.kernel.org, LAKML , KVM Subject: Re: [PATCH v3 1/1] irqchip/gic-v4.1: Disable vSGI upon (GIC CPUIF < v4.1) detection In-Reply-To: <20210317100719.3331-2-lorenzo.pieralisi@arm.com> References: <20210302102744.12692-1-lorenzo.pieralisi@arm.com> <20210317100719.3331-1-lorenzo.pieralisi@arm.com> <20210317100719.3331-2-lorenzo.pieralisi@arm.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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: lorenzo.pieralisi@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210317_140442_866909_89B3643F X-CRM114-Status: GOOD ( 17.22 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Lorenzo, Wed, 17 Mar 2021 10:07:19 +0000, Lorenzo Pieralisi wrote: > > GIC CPU interfaces versions predating GIC v4.1 were not built to > accommodate vINTID within the vSGI range; as reported in the GIC > specifications (8.2 "Changes to the CPU interface"), it is > CONSTRAINED UNPREDICTABLE to deliver a vSGI to a PE with > ID_AA64PFR0_EL1.GIC < b0011. > > Check the GIC CPUIF version by reading the SYS_ID_AA64_PFR0_EL1. > > Disable vSGIs if a CPUIF version < 4.1 is detected to prevent using > vSGIs on systems where they may misbehave. > > Signed-off-by: Lorenzo Pieralisi > Cc: Marc Zyngier Does it need to go in as a fix? or can it just be pushed into 5.13? Given that there is no such HW in the wild just yet, I'm inclined to do the latter... Thanks, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel