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=-5.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_MUTT 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 9523CC31E73 for ; Mon, 10 Jun 2019 14:28:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4F29E207E0 for ; Mon, 10 Jun 2019 14:28:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="npuPcaCj" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4F29E207E0 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tzgJZ476sPW2DA9/Qii8fVPnd8MSZYg9prG4KTRxQiE=; b=npuPcaCjbXsj4g zlMDYD4RImSk6ilMURdclBSKsRNe40YBdLauPt/31yG+nvgFxTxorh6BhzVxMA6pwbXH8DExA0MBw wanSjSbIeQMG5StgwoQ8TxM0C+6ttMllNT1f4O0x63ZE+ptdxsYE1gXvnYw1L3s6Rxw5cOANGSs6P POGkUeG4XV9eqG6iWocizuSgsn+zRj33G2qCJrkSm4VR+ghzuD7p6pSMM4bLEv7eurRDjpCgr/u1h +Cvr4IQ6Tuq8FB9YgRYw6w15hpzKoZWTzebE/G5Wt/fDu64rB0D/5IZEX2VVwy4p3wpoJljawO7Zb 44I9CSgo8k1mPw3epDJw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1haLHs-000141-UM; Mon, 10 Jun 2019 14:28:40 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1haLHo-00012q-HZ for linux-arm-kernel@lists.infradead.org; Mon, 10 Jun 2019 14:28:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A6C8A344; Mon, 10 Jun 2019 07:28:35 -0700 (PDT) Received: from c02tf0j2hf1t.cambridge.arm.com (c02tf0j2hf1t.cambridge.arm.com [10.1.32.192]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AF14A3F73C; Mon, 10 Jun 2019 07:28:27 -0700 (PDT) Date: Mon, 10 Jun 2019 15:28:25 +0100 From: Catalin Marinas To: Andrey Konovalov Subject: Re: [PATCH v16 05/16] arm64: untag user pointers passed to memory syscalls Message-ID: <20190610142824.GB10165@c02tf0j2hf1t.cambridge.arm.com> References: <045a94326401693e015bf80c444a4d946a5c68ed.1559580831.git.andreyknvl@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <045a94326401693e015bf80c444a4d946a5c68ed.1559580831.git.andreyknvl@google.com> User-Agent: Mutt/1.11.2 (2019-01-07) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190610_072836_663748_90F33688 X-CRM114-Status: GOOD ( 12.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , kvm@vger.kernel.org, Szabolcs Nagy , Will Deacon , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Khalid Aziz , linux-kselftest@vger.kernel.org, Felix Kuehling , Vincenzo Frascino , Jacob Bramley , Leon Romanovsky , linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Jason Gunthorpe , Dmitry Vyukov , Dave Martin , Evgeniy Stepanov , linux-media@vger.kernel.org, Kevin Brodsky , Kees Cook , Ruben Ayrapetyan , Ramana Radhakrishnan , Alex Williamson , Mauro Carvalho Chehab , linux-arm-kernel@lists.infradead.org, Kostya Serebryany , Greg Kroah-Hartman , Yishai Hadas , linux-kernel@vger.kernel.org, Jens Wiklander , Lee Smith , Alexander Deucher , Andrew Morton , enh , Robin Murphy , Christian Koenig , Luc Van Oostenryck Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Jun 03, 2019 at 06:55:07PM +0200, Andrey Konovalov wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > This patch allows tagged pointers to be passed to the following memory > syscalls: get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mprotect, > mremap, msync, munlock. > > Signed-off-by: Andrey Konovalov I would add in the commit log (and possibly in the code with a comment) that mremap() and mmap() do not currently accept tagged hint addresses. Architectures may interpret the hint tag as a background colour for the corresponding vma. With this: Reviewed-by: Catalin Marinas -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel