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 7179EC74A5B for ; Fri, 17 Mar 2023 15:08:35 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZH/v130qimwMNqEKb4gfUAJp/GdqKPsl0B095Jmg4fo=; b=LTJP6Mo5u8JcQT 8opK98hqPvSoBUTHsROFEJ456FWE5mKH2YUZjaF6bjzYzwjh3MRfDjL14TQxQQ2zVSzPcsfFIj7of f/kG2JlRri6fQXAmFx8X5wabam9G9TUqvrlFx72F/nO847M/A20Ken0eQaQgAzSaxsisLy9md3jKk rAktS9Hp4m1cxor3CeGeWswUe5ULAkd+7AjUEBodDV2VwBel1f1E/Nn6tHJLM+0bFgtK4wKvSZpJZ 2gl1fIKmG/mOzJ40mdKPG4VWokcyuldNygn+wf/zF3hul5zjHpg2AhptcfUb2JJPaGA6xoGWfy8kU mMg08pmDpshl0YNUheMw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pdBgK-002YjM-0O; Fri, 17 Mar 2023 15:07:48 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pdBgF-002YgD-2z for linux-arm-kernel@lists.infradead.org; Fri, 17 Mar 2023 15:07:46 +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 dfw.source.kernel.org (Postfix) with ESMTPS id 775DE60A26; Fri, 17 Mar 2023 15:07:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D489C4339B; Fri, 17 Mar 2023 15:07:40 +0000 (UTC) Date: Fri, 17 Mar 2023 15:07:37 +0000 From: Catalin Marinas To: Kristina Martsenko Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, Will Deacon , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Mark Rutland , Mark Brown , Luis Machado , Vladimir Murzin , linux-kernel@vger.kernel.org Subject: Re: [PATCH 04/10] arm64: mops: document boot requirements for MOPS Message-ID: References: <20230216160012.272345-1-kristina.martsenko@arm.com> <20230216160012.272345-5-kristina.martsenko@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230216160012.272345-5-kristina.martsenko@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230317_080744_031169_1BB05EC4 X-CRM114-Status: GOOD ( 11.26 ) 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 Thu, Feb 16, 2023 at 04:00:06PM +0000, Kristina Martsenko wrote: > + For CPUs with Memory Copy and Memory Set instructions (FEAT_MOPS): > + > + - If the kernel is entered at EL1 and EL2 is present: > + > + - HCRX_EL2.MSCEn (bit 11) must be initialised to 0b1. > + > + - HCRX_EL2.MCE2 (bit 10) must be initialised to 0b0. Regarding MCE2, does EL1 actually care if EL2 wants to handle all the memcpy/memset exceptions? There may even be a valid case to do this at EL2 if you run a guest that uses these instructions but has no clue on how to deal with the specific exception like WrongOption. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel