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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 32ADBC31E5B for ; Mon, 17 Jun 2019 18:56:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E545A2084D for ; Mon, 17 Jun 2019 18:56:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E545A2084D 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 91C718E0005; Mon, 17 Jun 2019 14:56:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8CDEE8E0001; Mon, 17 Jun 2019 14:56:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 794BE8E0005; Mon, 17 Jun 2019 14:56:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pg1-f197.google.com (mail-pg1-f197.google.com [209.85.215.197]) by kanga.kvack.org (Postfix) with ESMTP id 457E18E0001 for ; Mon, 17 Jun 2019 14:56:00 -0400 (EDT) Received: by mail-pg1-f197.google.com with SMTP id a21so8296133pgh.11 for ; Mon, 17 Jun 2019 11:56:00 -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=TqqDQD88JaOlX3rCS6V84oFqbgyBqZEvz/t0YbcCqPg=; b=j0M2Bq/QoBC645/O+WZRZca5m/u9e8STYAFplgIx9ANlVWt4xqNKsz1ICt7JPZ3FHu Yw1bxB0tt5CSsxa8Mc/AQMetk9FG5sHFsimHxx+yQmllNz0Vza+f5KNhfMudf/kPBEaq aU1agiX5FfirfoxF51LKZQLMAI9/hv+0+daqhfTxDjMJ6RFR7ayEGRaYFp8eSLcwm8EQ VAVRPZNsf/xor8LEGAy1Lk1E6AO/ZNm/eUsCDaPxJ33pwj9NIK1wzWBIcpUeFcxTKUHG z5W6a8zHP8kQvzrAmBUwFpts2qbDujhC2+4UwklUE5QoSWlESgJVlvFgTE9895w5WaX4 6gCA== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 134.134.136.126 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: APjAAAXc5Ct6cutOEP0Tlb6UgHL2yN6VHF/O7QUpQffA0vnuB9EfoOXt 60h8cJcm2iludaBM1n28r2tstMIoV9hjjhF9C7wYxUhNS/owT1IZrevOs8WNPgJkNN3EfmZR42c K/h0Ztgzwf+cMicq4x7iRJu4nvqCZzdcua/yI6Fkvry+pmiOuzTIuWvhQtet1YITcPw== X-Received: by 2002:a62:778d:: with SMTP id s135mr44236807pfc.204.1560797759846; Mon, 17 Jun 2019 11:55:59 -0700 (PDT) X-Google-Smtp-Source: APXvYqxFQAg14Wv7WeGfKLqFpgXM+OAd+RJ62dBJp1ENSObQ1dYfty2h15rlTNU7CutHHVROg37D X-Received: by 2002:a62:778d:: with SMTP id s135mr44236750pfc.204.1560797759264; Mon, 17 Jun 2019 11:55:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1560797759; cv=none; d=google.com; s=arc-20160816; b=Giyz8SVm5SL93Pe6wIPstR+d80ipZHrutQd79UgTUpsPrpx/m62+wlgZAMlSZhe5WG xpGRE5+1xS7fol4p9q+j8JBOs6+OFVnKkwlMbi3Wz3kTq4OQVo7YzI5mo2WtNp7Zyveq l6TbS2Qwj6TQQ6SrWaaWxEL6uslwNSNaZHQCx6jtRuKnedCn+RYycEyjFTvQY+37vFpH Xei8s/fDyDxlXSehu66KC3d/+VTn3r1GimpfXarL3WaCkPf0QwcadXyiZoGfzsGdTkx6 9VzkQMHL/lhdK7bGkEp8yiEKKndFHFpADMpGR0LwH9EoY2qzybM/iU146VNQrkum/dYc u93A== 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=TqqDQD88JaOlX3rCS6V84oFqbgyBqZEvz/t0YbcCqPg=; b=WnxorHion5rZYVxEYrCY4EuawjyvOd0LBW5aUc0yGrGQbJ+mkGbBmELNqFJ5qq/aj3 JmL45e55xTqyIYYuqLtvnlQb5mF5QSEMPHwG5WmRksSJXMDZzISmh2zh9fhhIC3q6/Qk os3YvPGWyF5+99wP77pEwKiO6ibq2wxSyRPFWRnW3/FM8/mu+N3lrzF8T4gR0BiqJaue pguYulEv+kVLmYvdx68+bTpFBs/SX4jF3r4AtIESA8iclUrTOeUSaQcNkraXMurqs+Ru MSroz9kA7lCInksSUldZzeR7ikiZoAW7yJJQ/MCtVnf8hLn3oenXMkEa/LOvssJlr0En CX3g== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 134.134.136.126 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from mga18.intel.com (mga18.intel.com. [134.134.136.126]) by mx.google.com with ESMTPS id b14si119547pjq.0.2019.06.17.11.55.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Jun 2019 11:55:59 -0700 (PDT) Received-SPF: pass (google.com: domain of dave.hansen@intel.com designates 134.134.136.126 as permitted sender) client-ip=134.134.136.126; Authentication-Results: mx.google.com; spf=pass (google.com: domain of dave.hansen@intel.com designates 134.134.136.126 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 orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jun 2019 11:55:56 -0700 X-ExtLoop1: 1 Received: from ray.jf.intel.com (HELO [10.7.201.126]) ([10.7.201.126]) by orsmga002.jf.intel.com with ESMTP; 17 Jun 2019 11:55:58 -0700 Subject: Re: [RFC 00/10] Process-local memory allocations for hiding KVM secrets To: Nadav Amit Cc: Andy Lutomirski , Alexander Graf , Thomas Gleixner , Marius Hillenbrand , kvm list , LKML , Kernel Hardening , Linux-MM , Alexander Graf , David Woodhouse , the arch/x86 maintainers , Peter Zijlstra References: <20190612170834.14855-1-mhillenb@amazon.de> <58788f05-04c3-e71c-12c3-0123be55012c@amazon.com> <63b1b249-6bc7-ffd9-99db-d36dd3f1a962@intel.com> <698ca264-123d-46ae-c165-ed62ea149896@intel.com> <5AA8BF10-8987-4FCB-870C-667A5228D97B@gmail.com> <3131CDA2-F6CF-43AC-A9FC-448DC6983596@gmail.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: <57a319bf-73da-c04b-cdff-1717f3699268@intel.com> Date: Mon, 17 Jun 2019 11:55:58 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <3131CDA2-F6CF-43AC-A9FC-448DC6983596@gmail.com> 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 6/17/19 11:50 AM, Nadav Amit wrote: >> The idea is that you have a per-cpu address space. Certain kernel >> virtual addresses would map to different physical address based on where >> you are running. Each of the physical addresses would be "owned" by a >> single CPU and would, by convention, never use a PGD that mapped an >> address unless that CPU that "owned" it. >> >> In that case, you never really invalidate those addresses. > I understand, but as I see it, this is not related directly to PCIDs. Yeah, the only link I was thinking of is that we can manage per-CPU PGDs in the same way that we manage PCIDs. Basically we can reuse a chunk of the software concept.