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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 B0E60C433FF for ; Thu, 1 Aug 2019 15:36:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6905320838 for ; Thu, 1 Aug 2019 15:36:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6905320838 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 00F858E002B; Thu, 1 Aug 2019 11:36:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id F010A8E0001; Thu, 1 Aug 2019 11:36:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DA1CE8E002B; Thu, 1 Aug 2019 11:36:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pg1-f199.google.com (mail-pg1-f199.google.com [209.85.215.199]) by kanga.kvack.org (Postfix) with ESMTP id 9CC608E0001 for ; Thu, 1 Aug 2019 11:36:49 -0400 (EDT) Received: by mail-pg1-f199.google.com with SMTP id q10so22241572pgi.9 for ; Thu, 01 Aug 2019 08:36:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:subject:to:cc :references:from:openpgp:autocrypt:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=pFIkDprOVPUZ/xXF5sSjPW13WY05K5MRbOXBXwdSygw=; b=flRU44SnqFbjFUH1/NaKYoWkF3xpo81UUhn2nWSahUu19inkw5x3xRdKZ/rI/sqrWk MkWhITpA50VQ/K7U3jv8176VTvexVbeVGHm32rduMxXGToJ/PvaRJNjUa0XyYpNQ0bWp 01v2HMYhTaNZzzXjEULS+nFeo0Z5fi64vNLNz6KDy13l5zh8QNUy6/SxIN/f5lGQKZ0X j6bPpYwhR2zmiIr/bJNQ4WXi218QWSPMS25ePrxJg2HfABSFRZ0cvHUmFC2Q/gj2FKcm nIlRmfSp/vdKHsnjkf3nV/t3Et7fdp4u+M+B1TBW0mCcilSYCPteJnLQy263/qQ3vjkb y+kg== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.43 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Gm-Message-State: APjAAAXCwgBBrU3ZxzW6mtsWntQnd3m+e0PEVTsut4zgW1XpJ/UrP1AU h07JUtO6pctHn1hVOte8hXtLS7+rCKDXZpXIoH804KCd6qZDPX8JvgbmxaEjngOID0ASanbOHhC 5MLJqcEUHK3g+DXDjOjojnQiC1LEzfdwij0kzttgLiyOhNM15pekAdW+LibzWylghFw== X-Received: by 2002:aa7:9f1c:: with SMTP id g28mr53513260pfr.81.1564673809238; Thu, 01 Aug 2019 08:36:49 -0700 (PDT) X-Google-Smtp-Source: APXvYqxX8qqmTSv3p9TMrpk+iV3l5oPJg88ote/BDHE1Pd0l4wGEg7kFGeJr2d9xeVfeKjjPIFcM X-Received: by 2002:aa7:9f1c:: with SMTP id g28mr53513204pfr.81.1564673808405; Thu, 01 Aug 2019 08:36:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1564673808; cv=none; d=google.com; s=arc-20160816; b=oUCZh7VORHfFcMi6PfAmc6G/lAEfbcHIwMqop5US1HMVetoB/gu7+hrHXkiqrDBsXz xVIDLvKec2hWdCQsFnYNt4OND27vuK/aVTmGxlt4F8tnT6Gx0doLaCPsE5OR2IroCoNU 3hqrep6xNPzp+CkAAbvTnu6W7QrvfzTicdEfLz4uz4Q9Mdjyq3bKC8L7t+mCHP9aKqJ3 8DzyqSLlpeSoRjckZo86+hc1dGojq4I5jDczwwqoJ68lNXjVIA610zkS6HaYLOBR8oxO gXuHkROCKuX+qIr2G1CHx4nnOixh8+zxP8SLU95qSJnTdNB/SziiuwtOEKw3gzXV+7RC koKQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:autocrypt:openpgp:from:references:cc:to :subject; bh=pFIkDprOVPUZ/xXF5sSjPW13WY05K5MRbOXBXwdSygw=; b=ej1qjVAPtl2N5opO9/a/dYIVfNTMYmRTipDuQoxttFaghCcJPgF0fguRo36Db9xlfF EnEgwcMwibuQRL8WbTgxlPXSrXNnITL/ISkVb6AnwfCg0T5lJinSXsCsaOP04RATcHWm eN3CAj9SveNbxStQyO3CbBrfBjPIDuoazy0/GAysOuoEz2R9rrX9ishn9DeWmvSyOTuW AMovDelokdMytfAGETLZ14Nwf/dUGR075BBHfWc0/1FYlyBEr8Wm/1f4wgsg1emVKM7f H1jXl4BviZ6W+vQ01lMXJ8Qa1O4sk34aKqriDtug3vBEJPylmDos/JRP70GPMn/I+LIf StLA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.43 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from mga05.intel.com (mga05.intel.com. [192.55.52.43]) by mx.google.com with ESMTPS id k73si4852294pje.10.2019.08.01.08.36.48 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 01 Aug 2019 08:36:48 -0700 (PDT) Received-SPF: pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.43 as permitted sender) client-ip=192.55.52.43; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 192.55.52.43 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 Aug 2019 08:36:47 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,334,1559545200"; d="scan'208";a="184278760" Received: from unknown (HELO [10.7.201.140]) ([10.7.201.140]) by orsmga002.jf.intel.com with ESMTP; 01 Aug 2019 08:36:47 -0700 Subject: Re: [PATCH v19 00/15] arm64: untag user pointers passed to the kernel To: Andrey Konovalov , Kevin Brodsky Cc: Linux ARM , Linux Memory Management List , LKML , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" , Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Szabolcs Nagy References: <8c618cc9-ae68-9769-c5bb-67f1295abc4e@intel.com> <13b4cf53-3ecb-f7e7-b504-d77af15d77aa@arm.com> From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; keydata= mQINBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABtEVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT6JAjgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lcuQINBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABiQIfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y Message-ID: <96fd8da4-a912-f6cc-2b32-5791027dbbd5@intel.com> Date: Thu, 1 Aug 2019 08:36:47 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit 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 8/1/19 5:48 AM, Andrey Konovalov wrote: > On Thu, Aug 1, 2019 at 2:11 PM Kevin Brodsky wrote: >> On 31/07/2019 17:50, Dave Hansen wrote: >>> On 7/23/19 10:58 AM, Andrey Konovalov wrote: >>>> The mmap and mremap (only new_addr) syscalls do not currently accept >>>> tagged addresses. Architectures may interpret the tag as a background >>>> colour for the corresponding vma. >>> What the heck is a "background colour"? :) >> Good point, this is some jargon that we started using for MTE, the idea being that >> the kernel could set a tag value (specified during mmap()) as "background colour" for >> anonymous pages allocated in that range. >> >> Anyway, this patch series is not about MTE. Andrey, for v20 (if any), I think it's >> best to drop this last sentence to avoid any confusion. > Sure, thanks! OK, but what does that mean for tagged addresses getting passed to mmap/mremap? That sentence read to me like "architectures might allow tags for ...something...". So do we accept tagged addresses into those syscalls?