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=-8.2 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=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 6FE20C55179 for ; Thu, 5 Nov 2020 17:26:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D53C321734 for ; Thu, 5 Nov 2020 17:26:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D53C321734 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D06CF6B0154; Thu, 5 Nov 2020 12:25:59 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C911F6B0156; Thu, 5 Nov 2020 12:25:59 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B31956B0157; Thu, 5 Nov 2020 12:25:59 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id 8048E6B0154 for ; Thu, 5 Nov 2020 12:25:59 -0500 (EST) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 200518249980 for ; Thu, 5 Nov 2020 17:25:59 +0000 (UTC) X-FDA: 77451042438.23.place11_110835f272cb Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id 002CB37606 for ; Thu, 5 Nov 2020 17:25:58 +0000 (UTC) X-HE-Tag: place11_110835f272cb X-Filterd-Recvd-Size: 2258 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Thu, 5 Nov 2020 17:25:58 +0000 (UTC) Received: from gaia (unknown [2.26.170.190]) (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 BC05D206B6; Thu, 5 Nov 2020 17:25:53 +0000 (UTC) Date: Thu, 5 Nov 2020 17:25:50 +0000 From: Catalin Marinas To: Andrey Konovalov Cc: Will Deacon , Vincenzo Frascino , Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Branislav Rankov , Kevin Brodsky , Andrew Morton , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v8 30/43] arm64: kasan: Allow enabling in-kernel MTE Message-ID: <20201105172549.GE30030@gaia> References: <5e3c76cac4b161fe39e3fc8ace614400bc2fb5b1.1604531793.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5e3c76cac4b161fe39e3fc8ace614400bc2fb5b1.1604531793.git.andreyknvl@google.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Nov 05, 2020 at 12:18:45AM +0100, Andrey Konovalov wrote: > diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c > index 06ba6c923ab7..fcfbefcc3174 100644 > --- a/arch/arm64/kernel/mte.c > +++ b/arch/arm64/kernel/mte.c > @@ -121,6 +121,13 @@ void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag) > return ptr; > } > > +void __init mte_init_tags(u64 max_tag) > +{ > + /* Enable MTE Sync Mode for EL1. */ > + sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC); > + isb(); > +} Is this going to be called on each CPU? I quickly went through the rest of the patches and couldn't see how. -- Catalin