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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D5BBC433EF for ; Tue, 1 Feb 2022 18:12:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241824AbiBASMg (ORCPT ); Tue, 1 Feb 2022 13:12:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241809AbiBASKg (ORCPT ); Tue, 1 Feb 2022 13:10:36 -0500 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:32c8:5054:ff:fe00:142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 04BB6C061749 for ; Tue, 1 Feb 2022 10:09:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=+bf43MZnan/HCENtniTD41UY434rYW0WKJuUBjs6a0s=; b=zGtjrKrtmYzyoKb62hxFk0ti+0 2bCvlNm4hYUFNAWFPM0zymXH3TvEQt6Nky/vQflOSz7XASpsSf/Dr4P8nSF8QyM5PNeKchYeEMCWQ 4ma+p7OiE1Fj1wEl5Cv2tf85LV/g/g4hRWyeSY3NBYrY7FOtiZka+gpxUkk6UPD6ameXHTPtqvUQs PkSxhATQZMKray0gW5j6kn2+qlrg2p6ekI9X+gzvUlAiir9kQf/COXgVxJd8gCno/N2bwb/L52oJd WdC6csx4+X37GybgrZq4QHjPZDd19yisjdT1Rx5CFXYaPBeBtdmxcDIwXfz8N2v6FY8K5G8yVV0VA UCp7emSA==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:56982) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nExaN-0000vh-8D; Tue, 01 Feb 2022 18:08:59 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1nExaI-0002Gd-P8; Tue, 01 Feb 2022 18:08:54 +0000 Date: Tue, 1 Feb 2022 18:08:54 +0000 From: "Russell King (Oracle)" To: Marc Zyngier Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Andre Przywara , Christoffer Dall , Jintack Lim , Haibo Xu , Ganapatrao Kulkarni , Chase Conklin , James Morse , Suzuki K Poulose , Alexandru Elisei , karl.heubaum@oracle.com, mihai.carabas@oracle.com, miguel.luis@oracle.com, kernel-team@android.com Subject: Re: [PATCH v6 18/64] KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2 Message-ID: References: <20220128121912.509006-1-maz@kernel.org> <20220128121912.509006-19-maz@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220128121912.509006-19-maz@kernel.org> Sender: Russell King (Oracle) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, Jan 28, 2022 at 12:18:26PM +0000, Marc Zyngier wrote: > From: Christoffer Dall > > When running in virtual EL2 mode, we actually run the hardware in EL1 > and therefore have to use the EL1 registers to ensure correct operation. > > By setting the HCR.TVM and HCR.TVRM we ensure that the virtual EL2 mode > doesn't shoot itself in the foot when setting up what it believes to be > a different mode's system register state (for example when preparing to > switch to a VM). > > We can leverage the existing sysregs infrastructure to support trapped > accesses to these registers. > > Signed-off-by: Christoffer Dall > Signed-off-by: Marc Zyngier Reviewed-by: Russell King (Oracle) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!