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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D3A36C4332F for ; Wed, 4 Jan 2023 16:53:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=vJB2XvQ+9rFxjnl+brjAeJ1vUQj/Vh0ZRxyuH3P+OZc=; b=m6EM5Q7KVxDxDG 0/yaygVZK7sQUMchDw6cjJ+ItmUgRbzAX7CGOvXJJ8+WCfdHz6HX3w/dNbIx1E875weeV1N2c4MAI ejmP4uPk241wLRhooS6qB2ed1spjaIL0FoTe8G/XEBwB3gh3hLEkgA4FSlcDHn28mhC3PA8MK8VbM Giyj5/+by79FKujfXovYmptC2k6rbCFGPO4fqd8v325iSP9/ZlG6MVJfOQFTLipIckAy1dMjOjW3N FG2fLHR5SY42kW9Y600/oMc4Vq1idZ3ndaNz/784RvRq8HNpZ0fO9ypdvp9OEyDYYASeeHbcAUlo0 RTVtkFsPYhDumLwf5tAg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pD70A-00AVa1-Ph; Wed, 04 Jan 2023 16:52:30 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pD6yD-00AVHC-IN for linux-arm-kernel@lists.infradead.org; Wed, 04 Jan 2023 16:50:32 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 34856B8171E; Wed, 4 Jan 2023 16:50:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4449C433EF; Wed, 4 Jan 2023 16:50:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672851025; bh=NRTocVNnRkgSiKbRIelZpoZzMuWYoNRLOI/0iGhDOvM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=CD74LVf2Ai33wXUubayZzuFLSVPg6Ej5k9qS3XQbGA2S6nX/1vaJOQVk1a9aohBKN 9QgncNG55fqxY1hIcbo28TmgSTiMVgitFrVnZQjPrTWU1bhYtV9jQnmWVgS+h+zxX7 e4w6k8FAHuWXmW+SBZ58rUx8W0yYoBN1JtQzx56nmcPRgFRuwJL1lxoXJE0aseBO6j 7fm+uKB7GnQn+W+zWyQFFgg21oI12K+SRpqLRG+VY80FdJWbL2z/GBiNigpRnIxSJI DkjY0+D9ICM0aJRiMpMKmE1C/MLUcBqA8LOqVenHqYHu6Gnhy20bXSnbJGTyU63fom LU2Oi2L2ZXuBw== 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 4.95) (envelope-from ) id 1pD6y7-00Gnhb-NV; Wed, 04 Jan 2023 16:50:23 +0000 Date: Wed, 04 Jan 2023 16:50:23 +0000 Message-ID: <86pmbu6y7k.wl-maz@kernel.org> From: Marc Zyngier To: Mark Rutland , Joakim Tjernlund Cc: "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH] GICv3: Add restart handler to detach CPU from GICv3 In-Reply-To: References: <20221216162128.10808-1-joakim.tjernlund@infinera.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/28.2 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: mark.rutland@arm.com, Joakim.Tjernlund@infinera.com, linux-arm-kernel@lists.infradead.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-20230104_085029_960354_923E6C3F X-CRM114-Status: GOOD ( 25.49 ) 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 On Wed, 04 Jan 2023 16:04:14 +0000, Mark Rutland wrote: > > On Tue, Jan 03, 2023 at 04:27:07PM +0000, Joakim Tjernlund wrote: > > On Fri, 2022-12-16 at 17:21 +0100, Joakim Tjernlund wrote: > > > > Ping? > > To whom? > > You don't appeared to have Cc'd any relevant maintainer, and people are still > on holiday, so it's extremely likely this will be missed. That, plus nobody reads the list looking for this sort of things. > > For the maintainer, please use scripts/get_maintainer.pl, e.g. > > | [mark@lakrids:~/src/linux]% ./scripts/get_maintainer.pl -f drivers/irqchip/irq-gic-v3.c > | Thomas Gleixner (maintainer:IRQCHIP DRIVERS) > | Marc Zyngier (maintainer:IRQCHIP DRIVERS) > | linux-kernel@vger.kernel.org (open list:IRQCHIP DRIVERS) > > Note: I've Cc'd Marc, who wrote the GICv3 driver. Cheers Mark, much appreciated. > > > > Needed for reboot without resetting the whole GIC > > This doesn't really explain what you're trying to do nor why. > > Why do you need to "reboot without resetting the whole GIC" ? > > Do you encounter a problem if we try to reset the whole GIC? > > Is this for kexec? > > Is this for some use-case enabled by out-of-tree code? All valid questions. This smells of a terrible hack... The interesting aspect is that this is only done when DS=1, probably meaning that they are doing this in a VM. it also rely on some (unbounded) UNPRED behaviour as ProcessorSleep is entered without any consideration for Group0... Good luck with that. Anyway, I don't think we want any of this stuff. Certainly not without a cast-iron justification. 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