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=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 BE2AEC19437 for ; Tue, 8 Dec 2020 20:23:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 96B442388C for ; Tue, 8 Dec 2020 20:23:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731353AbgLHUQL (ORCPT ); Tue, 8 Dec 2020 15:16:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:33994 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731110AbgLHUN0 (ORCPT ); Tue, 8 Dec 2020 15:13:26 -0500 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1932923AFE; Tue, 8 Dec 2020 20:12:45 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=wait-a-minute.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1kmjLm-00HAXe-TJ; Tue, 08 Dec 2020 20:12:43 +0000 Date: Tue, 08 Dec 2020 20:12:41 +0000 Message-ID: <871rg05a6e.wl-maz@kernel.org> From: Marc Zyngier To: David Brazdil Cc: kvmarm@lists.cs.columbia.edu, Catalin Marinas , Lorenzo Pieralisi , linux-kernel@vger.kernel.org, Will Deacon , Tejun Heo , Dennis Zhou , linux-doc@vger.kernel.org, Jonathan Corbet , kernel-team@android.com, linux-arm-kernel@lists.infradead.org, Christoph Lameter , Sudeep Holla Subject: Re: [PATCH v4 00/26] Opt-in always-on nVHE hypervisor In-Reply-To: <20201208191447.47idqf7n2v3hvrdg@google.com> References: <20201202184122.26046-1-dbrazdil@google.com> <160702322202.1501317.9696987088711766533.b4-ty@kernel.org> <20201208191447.47idqf7n2v3hvrdg@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: dbrazdil@google.com, kvmarm@lists.cs.columbia.edu, catalin.marinas@arm.com, lorenzo.pieralisi@arm.com, linux-kernel@vger.kernel.org, will@kernel.org, tj@kernel.org, dennis@kernel.org, linux-doc@vger.kernel.org, corbet@lwn.net, kernel-team@android.com, linux-arm-kernel@lists.infradead.org, cl@linux.com, sudeep.holla@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Tue, 08 Dec 2020 19:14:47 +0000, David Brazdil wrote: > > Hey Marc, > > On Thu, Dec 03, 2020 at 07:23:19PM +0000, Marc Zyngier wrote: > > On Wed, 2 Dec 2020 18:40:56 +0000, David Brazdil wrote: > > > As we progress towards being able to keep guest state private to the > > > host running nVHE hypervisor, this series allows the hypervisor to > > > install itself on newly booted CPUs before the host is allowed to run > > > on them. > > > > > > All functionality described below is opt-in, guarded by an early param > > > 'kvm-arm.mode=protected'. Future patches specific to the new protected > > > mode should be hidden behind the same param. > > > > > > [...] > > > > Applied to kvm-arm64/psci-relay, thanks! > > > > Note that although I pushed it to -next, I still need people to > > eyeball it and give it some Acks. The commit-IDs below will > > thus change as I apply tags, if any. > > > > I'm looking at -next and I think the merge with Mark Rutland's el2_setup > refactor didn't go as planned. > > The `#ifdef CONFIG_ARM64_VHE` section needs to cover everything between > init_el2 and init_el2_nvhe. Currently the code falls through into VHE init > when CONFIG_ARM64_VHE is not set. Oops, well spotted. I wasn't thinking straight. I came up with a slightly different fix though, keeping the whole of the VHE code and instead restoring the "mov x2, xzr" we had before. I've pushed something out, do yell if you spot anything else. Thanks again, M. -- Without deviation from the norm, progress is not possible.