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=-14.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 3365FC433E0 for ; Thu, 18 Mar 2021 08:57:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E7C5864F18 for ; Thu, 18 Mar 2021 08:57:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229807AbhCRI5B (ORCPT ); Thu, 18 Mar 2021 04:57:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:55598 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229841AbhCRI4h (ORCPT ); Thu, 18 Mar 2021 04:56:37 -0400 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 3891164F01; Thu, 18 Mar 2021 08:56:36 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.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 1lMoSH-002MY8-4W; Thu, 18 Mar 2021 08:56:33 +0000 Date: Thu, 18 Mar 2021 08:56:32 +0000 Message-ID: <877dm4j0vz.wl-maz@kernel.org> From: Marc Zyngier To: Will Deacon Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, dave.martin@arm.com, daniel.kiss@arm.com, Catalin Marinas , James Morse , Julien Thierry , Suzuki K Poulose , broonie@kernel.org, kernel-team@android.com Subject: Re: [PATCH 06/10] KVM: arm64: Map SVE context at EL2 when available In-Reply-To: <20210317160112.GA5556@willie-the-truck> References: <20210316101312.102925-1-maz@kernel.org> <20210316101312.102925-7-maz@kernel.org> <20210317160112.GA5556@willie-the-truck> 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 EasyPG/1.0.0 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: will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, dave.martin@arm.com, daniel.kiss@arm.com, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, broonie@kernel.org, kernel-team@android.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: kvm@vger.kernel.org On Wed, 17 Mar 2021 16:01:12 +0000, Will Deacon wrote: > > On Tue, Mar 16, 2021 at 10:13:08AM +0000, Marc Zyngier wrote: > > When running on nVHE, and that the vcpu supports SVE, map the > > SVE state at EL2 so that KVM can access it. > > > > Signed-off-by: Marc Zyngier > > --- > > arch/arm64/kvm/fpsimd.c | 11 +++++++++++ > > 1 file changed, 11 insertions(+) > > > > diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c > > index b7e36a506d3d..84afca5ed6f2 100644 > > --- a/arch/arm64/kvm/fpsimd.c > > +++ b/arch/arm64/kvm/fpsimd.c > > @@ -43,6 +43,17 @@ int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu) > > if (ret) > > goto error; > > > > + if (vcpu->arch.sve_state) { > > + void *sve_end; > > + > > + sve_end = vcpu->arch.sve_state + vcpu_sve_state_size(vcpu) + 1; > > Why do you need the '+ 1' here? Only the need to add off-by-one bugs once in a while. I'll fix that in the next round. Thanks, M. -- Without deviation from the norm, progress is not possible.