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 51686E743C8 for ; Thu, 28 Sep 2023 22:20:18 +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=MFlgHtaqAO0b3qqbK9wj1WzHeYh2hs5m0vfjilo1ZxE=; b=DUIHIcyWtu/klA Mxqd6YGAx4N3MJjC58Vg3mpPqIrTNJh3kcg16pgKX2ObM+dQtLQzy7OTNue8znNY3vU1i9M3rW+nD +nl8Z/8mFNXoSgbFD5G5CIHKyKj18YLJPbBkKeOD2I3x1k2XFfh+wPI4BF4Emy7jX26r9zMWLsQh4 QCgFsHngafMkJJQNGCmVHCl8VY6A8Uk+VrjF5VG12rV/Yyzu3lCjF6494Y0FIyhYmGYvnPSHfPwA7 ZTWiRIPFFMZVAMB6L41B3fcr/uA1Tlw+gGNjGO7cvlC7GcvOi3mgKaqSZUP54cD2c23drDf7SGFuv RQPC2Lkoa1ORH3lNoWVQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qlzML-006lnq-00; Thu, 28 Sep 2023 22:19:49 +0000 Received: from out-194.mta1.migadu.com ([95.215.58.194]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qlzMH-006lnO-2W for linux-arm-kernel@lists.infradead.org; Thu, 28 Sep 2023 22:19:47 +0000 Date: Thu, 28 Sep 2023 22:19:36 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1695939581; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=yGg7pY7KhRw+YOmFUl/1WZXjN2FD7xN06g/pv2WG4WM=; b=CBhdNxghpB0mVzHuuSrw6OO1UOX2NdQT+l0g3mJkq8XiaAoFRUSGq02uLp1lXMIYGt7fyh 24AHdiCCyF/bnXzHtA20ShPSFQvWnPxZGxb5sL5HqFfMz6rTxvSiuXXBzo3ZfxvUjjeLWh 21juYxDuBNTUCaOJWDVgbaNNRkdXw78= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Oliver Upton To: Kristina Martsenko Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Marc Zyngier , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Vladimir Murzin , Colton Lewis , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 0/2] KVM: arm64: Support for Arm v8.8 memcpy instructions in KVM guests Message-ID: References: <20230922112508.1774352-1-kristina.martsenko@arm.com> <6687f58c-0da9-0583-2dc1-2089f292b745@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <6687f58c-0da9-0583-2dc1-2089f292b745@arm.com> X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230928_151946_232771_6979AB5C X-CRM114-Status: GOOD ( 13.03 ) 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, Sep 28, 2023 at 05:55:39PM +0100, Kristina Martsenko wrote: [...] > > Perhaps I'm being pedantic, but I'd really like for there to be some > > documentation that suggests MOPS exceptions can happen due to context > > migration done by a higher EL as that is the only option in the context > > of virtualization. > > That's a good point. This shouldn't affect Linux guests as Linux is > always able to handle a MOPS exception coming from EL0. But it would > affect any non-Linux guest that pins all its EL0 tasks and doesn't > implement a handler. It's not clear to me what the expectation for > guests is, I'll ask the architects to clarify and get back to you. That'd be excellent, thanks! All I'm looking for is something to point folks at if/when they complain about MOPS behavior in KVM guests. -- Thanks, Oliver _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel