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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C08DC3ABC9 for ; Fri, 16 May 2025 13:42:13 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AB5EC6B017F; Fri, 16 May 2025 09:42:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A3C1E6B0180; Fri, 16 May 2025 09:42:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8DF826B0181; Fri, 16 May 2025 09:42:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 6D44D6B017F for ; Fri, 16 May 2025 09:42:11 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 1F40F1A05E9 for ; Fri, 16 May 2025 13:42:12 +0000 (UTC) X-FDA: 83448884904.23.D286546 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) by imf19.hostedemail.com (Postfix) with ESMTP id 3ECA71A0008 for ; Fri, 16 May 2025 13:42:09 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=huoh5A6w; spf=pass (imf19.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.17 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1747402930; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rekZgZMqksNbTpV3xuBOJWjJoWUMY3kht6BVk5/K45o=; b=fnIa5RXA1sCgowml8RsYohmLNyfGR54+XGOdVbJmBVsPoWRrPxDRzRwlEBNTqa6jOtDnRF ZXyOb+jeaFTGIW62SRAoYQ7JuUIt7ESCo2qoHl6n/U9TkgbZO4YoUKzaO1o4G6DjajUF5p GbaloHKPrH2DpYG+F86O6p+lhAFYS5g= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1747402930; a=rsa-sha256; cv=none; b=JwGv7reWSs7UmOY97la2nS3d89wMEMCgAL2oCWoHpTRceJfHxi8Kc25fH2vublFuoB+ZZv wsrsZYG+Q1l0a+xay/KRPzWeTGywuyx2NQg7F68ygehUuZdsg/oYncN9kHMAnH8IzgKvlf qHXGkaxyGOqgXky1J0tiRxWDnRFIT7A= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=huoh5A6w; spf=pass (imf19.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.17 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1747402930; x=1778938930; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=xYrmVzF1TSKNpV31o57SSBCmHQQJ7QTKWMUe9SM2OCE=; b=huoh5A6weOpQNduJ3XPSEp6hyoewOrXsYt1YUu53sbQfnH9bAU4681Pq I96WSzBInS547A/qhxnBPCu3ltiDEruwhmzvQkjSxR5plC9ZWLIzzp9Fd sLQ66X0qBCHVqdHSLYVHGK9X6EsRlMKTZi3Fu6biMYG0+F1VdeyPFEZSF RkTVNYUNvgJsZ93u2wJMj7hSuDZZLnbPELgZJXiVHC5KP24RgmxvjtriU 5c0tJFD/mXLNLILzKqfolSVhNQF/L5IikryZewlpaRayS+SVhG6EcYEDD iI1AiIFFg58Ik0EaTSY5GFKA+qSxZCNWjP8nzky3o7l/icvT91/Gxf5js g==; X-CSE-ConnectionGUID: Gmvz9nK/QmSOsrRUchnwMQ== X-CSE-MsgGUID: c2L45EqqRpCxeCASaYf9CA== X-IronPort-AV: E=McAfee;i="6700,10204,11435"; a="49359969" X-IronPort-AV: E=Sophos;i="6.15,293,1739865600"; d="scan'208";a="49359969" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 May 2025 06:42:08 -0700 X-CSE-ConnectionGUID: 1/ctc2i/SrCNez2NKC/sXg== X-CSE-MsgGUID: 2rUPzOIfTAeBLXo40kOOMw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,293,1739865600"; d="scan'208";a="143583158" Received: from vverma7-desk1.amr.corp.intel.com (HELO [10.125.109.57]) ([10.125.109.57]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 May 2025 06:42:07 -0700 Message-ID: <30570ca0-8da4-4ebc-84d6-0a4badfb7154@intel.com> Date: Fri, 16 May 2025 06:42:03 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model To: "Kirill A. Shutemov" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" Cc: Jonathan Corbet , Andy Lutomirski , Peter Zijlstra , Ard Biesheuvel , Jan Kiszka , Kieran Bingham , Michael Roth , Rick Edgecombe , Brijesh Singh , Sandipan Das , Juergen Gross , Tom Lendacky , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org References: <20250516123306.3812286-1-kirill.shutemov@linux.intel.com> <20250516123306.3812286-3-kirill.shutemov@linux.intel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC 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/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+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 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd 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+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw 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 In-Reply-To: <20250516123306.3812286-3-kirill.shutemov@linux.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 3ECA71A0008 X-Stat-Signature: ahunosig8o59c78b1zff96tjaheaa77t X-Rspam-User: X-HE-Tag: 1747402929-146024 X-HE-Meta: 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 S8UjkAwc Yt8QraBsK/CCmq6T/rGkUN29yxc4DneqqalL73UB3HRrRZzaAobJ9etJV4wbO1z+wB3hz+tR4MpEk+1UibMhalLIljqc26bPWptrOHeAWqgivqu93tikOndJVjUuCCAY40bfoHiRNavkf7Mdbs0+JhA0GJQeN2/sdxbK4b6ATI2N5OzneDmZdVYayvcj8ZHEkICkOizy2TVqvhsH8H0UrWcxL4829mN/bALQkpe4i+Bz4XO2OanC4xykPg9S6tSDO1Hww 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: List-Subscribe: List-Unsubscribe: On 5/16/25 05:33, Kirill A. Shutemov wrote: > 5-level paging only supports SPARSEMEM_VMEMMAP. CONFIG_X86_5LEVEL is > being phased out, making 5-level paging support mandatory. > > Make CONFIG_SPARSEMEM_VMEMMAP mandatory for x86-64 and eliminate > any associated conditional statements. I think we have ourselves a catch-22 here. SPARSEMEM_VMEMMAP was selected because the other sparsemem modes couldn't handle a dynamic MAX_PHYS{MEM,ADDR}_BITS introduced by 5-level paging. Now you're proposing making it static again, but keeping the SPARSEMEM_VMEMMAP dependency. If you remove the dynamic MAX_PHYS{MEM,ADDR}_BITS, you should also remove the dependency on SPARSEMEM_VMEMMAP. No?