From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752564AbdBAQWX (ORCPT ); Wed, 1 Feb 2017 11:22:23 -0500 Received: from foss.arm.com ([217.140.101.70]:37392 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752405AbdBAQWU (ORCPT ); Wed, 1 Feb 2017 11:22:20 -0500 Subject: Re: [PATCH 04/10] arm64: head.S: Enable EL1 (host) access to SPE when entered at EL2 To: Will Deacon , linux-arm-kernel@lists.infradead.org References: <1485540470-11469-1-git-send-email-will.deacon@arm.com> <1485540470-11469-5-git-send-email-will.deacon@arm.com> Cc: mark.rutland@arm.com, kim.phillips@arm.com, alex.bennee@linaro.org, christoffer.dall@linaro.org, tglx@linutronix.de, peterz@infradead.org, alexander.shishkin@linux.intel.com, robh@kernel.org, suzuki.poulose@arm.com, pawel.moll@arm.com, mathieu.poirier@linaro.org, mingo@redhat.com, linux-kernel@vger.kernel.org From: Marc Zyngier X-Enigmail-Draft-Status: N1110 Organization: ARM Ltd Message-ID: <8b3f5174-cbe4-c6cd-3179-fa4d32868b46@arm.com> Date: Wed, 1 Feb 2017 16:22:15 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.5.1 MIME-Version: 1.0 In-Reply-To: <1485540470-11469-5-git-send-email-will.deacon@arm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27/01/17 18:07, Will Deacon wrote: > The SPE architecture requires each exception level to enable access > to the SPE controls for the exception level below it, since additional > context-switch logic may be required to handle the buffer safely. > > This patch allows EL1 (host) access to the SPE controls when entered at > EL2. > > Cc: Marc Zyngier > Signed-off-by: Will Deacon Definitely more readable than the initial version! ;-) Acked-by: Marc Zyngier M. -- Jazz is not dead. It just smells funny...