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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8000AC433F5 for ; Tue, 1 Feb 2022 18:09:09 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D767E49E21; Tue, 1 Feb 2022 13:09:08 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@armlinux.org.uk Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vBbaaRFd3bza; Tue, 1 Feb 2022 13:09:07 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 62A8749E36; Tue, 1 Feb 2022 13:09:07 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id DEC7149E22 for ; Tue, 1 Feb 2022 13:09:06 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7OJeBSCEx4WE for ; Tue, 1 Feb 2022 13:09:05 -0500 (EST) Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 5056D4120D for ; Tue, 1 Feb 2022 13:09:05 -0500 (EST) 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 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-Disposition: inline In-Reply-To: <20220128121912.509006-19-maz@kernel.org> Cc: kernel-team@android.com, kvm@vger.kernel.org, Andre Przywara , Christoffer Dall , Chase Conklin , kvmarm@lists.cs.columbia.edu, mihai.carabas@oracle.com, Ganapatrao Kulkarni , linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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! _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm