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=-5.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_MUTT 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 B891CC43381 for ; Tue, 26 Feb 2019 12:13:39 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 8870B21855 for ; Tue, 26 Feb 2019 12:13:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="If6LeIlQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8870B21855 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject: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=4xHzCxyzq7ja2W6EwYdr3aGg5qMYWJUrL5DZ1vej50Q=; b=If6LeIlQyKke/b Kh/pCHlK0WMqBVicLhYH8KqQNSilqTD1yq3tRnIsM+tLln4sCBzLwn+NUB7poq0jlr9WBl3C0BKPQ lazoJdanGLeDmSq9hRBv8YQAKED/XTHea3W9vdMD5T+FcXWdqnIYOCgMMcihOpcQ1l7u6npL2qEs7 AT4tfdWS44FUocmnN2hC2IDtG86pJcp1SogWQyg2l7vKfEeo/iNU3/gXbAclJbenfYn+TgDuJF/qp OMbUQvoCvB0Z5Iw6gUPwIcdZwuQ2WcWFMFlNPJ6Y8Q0OwaibjfVuQTQQtcUnHPnwCwscRp3WJ/d4a rPJCmR58siG6t23ZyehQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gybc8-0007Qq-16; Tue, 26 Feb 2019 12:13:36 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gybby-0007II-6l for linux-arm-kernel@lists.infradead.org; Tue, 26 Feb 2019 12:13:29 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 04557A78; Tue, 26 Feb 2019 04:13:26 -0800 (PST) Received: from e103592.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 379E03F5C1; Tue, 26 Feb 2019 04:13:24 -0800 (PST) Date: Tue, 26 Feb 2019 12:13:21 +0000 From: Dave Martin To: Julien Thierry Subject: Re: [PATCH v5 14/26] KVM: arm64/sve: Context switch the SVE registers Message-ID: <20190226121321.GQ3567@e103592.cambridge.arm.com> References: <1550519559-15915-1-git-send-email-Dave.Martin@arm.com> <1550519559-15915-15-git-send-email-Dave.Martin@arm.com> <83fa5587-24a0-5bbb-c113-cddc74571ea2@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <83fa5587-24a0-5bbb-c113-cddc74571ea2@arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190226_041326_713789_C5032645 X-CRM114-Status: GOOD ( 18.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Okamoto Takayuki , Christoffer Dall , Ard Biesheuvel , Marc Zyngier , Catalin Marinas , Will Deacon , Zhang Lei , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Feb 20, 2019 at 04:46:57PM +0000, Julien Thierry wrote: > > > On 18/02/2019 19:52, Dave Martin wrote: > > In order to give each vcpu its own view of the SVE registers, this > > patch adds context storage via a new sve_state pointer in struct > > vcpu_arch. An additional member sve_max_vl is also added for each > > vcpu, to determine the maximum vector length visible to the guest > > and thus the value to be configured in ZCR_EL2.LEN while the is > > "While the is active"? Hmmm, yes. Thanks for deciphering that. Done. > > active. This also determines the layout and size of the storage in > > sve_state, which is read and written by the same backend functions > > that are used for context-switching the SVE state for host tasks. > > > > On SVE-enabled vcpus, SVE access traps are now handled by switching > > in the vcpu's SVE context and disabling the trap before returning > > to the guest. On other vcpus, the trap is not handled and an exit > > back to the host occurs, where the handle_sve() fallback path > > reflects an undefined instruction exception back to the guest, > > consistently with the behaviour of non-SVE-capable hardware (as was > > done unconditionally prior to this patch). > > > > No SVE handling is added on non-VHE-only paths, since VHE is an > > architectural and Kconfig prerequisite of SVE. > > > > Signed-off-by: Dave Martin > > > > Otherwise: > > Reviewed-by: Julien Thierry Thanks ---Dave _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel