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=-8.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 43671C433E1 for ; Thu, 27 Aug 2020 10:02:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2175E20825 for ; Thu, 27 Aug 2020 10:02:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728512AbgH0KCB (ORCPT ); Thu, 27 Aug 2020 06:02:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:56854 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726988AbgH0KCB (ORCPT ); Thu, 27 Aug 2020 06:02:01 -0400 Received: from gaia (unknown [46.69.195.127]) (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 71C892075B; Thu, 27 Aug 2020 10:01:58 +0000 (UTC) Date: Thu, 27 Aug 2020 11:01:56 +0100 From: Catalin Marinas To: Andrey Konovalov Cc: Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Elena Petrova , Branislav Rankov , Kevin Brodsky , Will Deacon , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 22/35] arm64: mte: Enable in-kernel MTE Message-ID: <20200827100155.GD29264@gaia> References: <6a83a47d9954935d37a654978e96c951cc56a2f6.1597425745.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6a83a47d9954935d37a654978e96c951cc56a2f6.1597425745.git.andreyknvl@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 14, 2020 at 07:27:04PM +0200, Andrey Konovalov wrote: > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index 4d3abb51f7d4..4d94af19d8f6 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -1670,6 +1670,9 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) > write_sysreg_s(0, SYS_TFSR_EL1); > write_sysreg_s(0, SYS_TFSRE0_EL1); > > + /* Enable Match-All at EL1 */ > + sysreg_clear_set(tcr_el1, 0, SYS_TCR_EL1_TCMA1); > + > /* > * CnP must be enabled only after the MAIR_EL1 register has been set > * up. Inconsistent MAIR_EL1 between CPUs sharing the same TLB may > @@ -1687,6 +1690,9 @@ static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) > mair &= ~MAIR_ATTRIDX(MAIR_ATTR_MASK, MT_NORMAL_TAGGED); > mair |= MAIR_ATTRIDX(MAIR_ATTR_NORMAL_TAGGED, MT_NORMAL_TAGGED); > write_sysreg_s(mair, SYS_MAIR_EL1); > + > + /* Enable MTE Sync Mode for EL1 */ > + sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC); In the 8th incarnation of the user MTE patches, this initialisation moved to proc.S before the MMU is initialised. When rebasing, please take this into account. -- Catalin