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,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 22974C433E2 for ; Thu, 17 Sep 2020 17:06:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B4796221EE for ; Thu, 17 Sep 2020 17:06:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B4796221EE Authentication-Results: mail.kernel.org; dmarc=none (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 159196B006E; Thu, 17 Sep 2020 13:06:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E3278E0001; Thu, 17 Sep 2020 13:06:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EECBE6B0072; Thu, 17 Sep 2020 13:06:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0109.hostedemail.com [216.40.44.109]) by kanga.kvack.org (Postfix) with ESMTP id D99A86B006E for ; Thu, 17 Sep 2020 13:06:09 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 96703824999B for ; Thu, 17 Sep 2020 17:06:09 +0000 (UTC) X-FDA: 77273181258.10.spy34_1c06c0b27124 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin10.hostedemail.com (Postfix) with ESMTP id EA7FB16A4A1 for ; Thu, 17 Sep 2020 17:06:07 +0000 (UTC) X-HE-Tag: spy34_1c06c0b27124 X-Filterd-Recvd-Size: 2521 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Sep 2020 17:06:07 +0000 (UTC) Received: from gaia (unknown [31.124.44.166]) (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 49B78214D8; Thu, 17 Sep 2020 17:06:04 +0000 (UTC) Date: Thu, 17 Sep 2020 18:06:01 +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 v2 26/37] arm64: mte: Convert gcr_user into an exclude mask Message-ID: <20200917170601.GO10662@gaia> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Tue, Sep 15, 2020 at 11:16:08PM +0200, Andrey Konovalov wrote: > From: Vincenzo Frascino > > The gcr_user mask is a per thread mask that represents the tags that are > excluded from random generation when the Memory Tagging Extension is > present and an 'irg' instruction is invoked. > > gcr_user affects the behavior on EL0 only. > > Currently that mask is an include mask and it is controlled by the user > via prctl() while GCR_EL1 accepts an exclude mask. > > Convert the include mask into an exclude one to make it easier the > register setting. > > Note: This change will affect gcr_kernel (for EL1) introduced with a > future patch. > > Signed-off-by: Vincenzo Frascino > Signed-off-by: Andrey Konovalov Reviewed-by: Catalin Marinas