Received: by 2002:a05:7412:3b8b:b0:fc:a2b0:25d7 with SMTP id nd11csp1236003rdb; Fri, 9 Feb 2024 15:03:36 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCVhb+1SGrruKVyPb0lugCrZGI189duTlItV+MWGaMdwePQvX1kXX8HS1trO4VNDjLMA5x3DDFyxP4I+os72l+RWTlDX/2EdsjeuirKVIA== X-Google-Smtp-Source: AGHT+IGJCeRPYPCxokgCUt3q//vIjF/NuZu0OS4exeNYBUIw0AStTUzuGxB8sqBit8RBWoUSV92k X-Received: by 2002:a05:6a20:d498:b0:19c:6620:483c with SMTP id im24-20020a056a20d49800b0019c6620483cmr683857pzb.23.1707519815973; Fri, 09 Feb 2024 15:03:35 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1707519815; cv=pass; d=google.com; s=arc-20160816; b=TPPknBKtbF5j9KK1gooAR3TFFjhIUSV2UmdV24jokqzlvBAoJu53NzgFwBSQ21ZJ7R 9SwglB40L+ahxPJ+Xg/YtxSQTV7UTMYFfxyUU54+3hzBpCHjEghkmHL2fMCknsDuqnnd a7hSJpXHflx+krbctb/pDcaHw5dQaJfUAOCnY901BANbllbNfh8GKkKxfzSguDoooH2f J+cnaAnBiA5h2i1wUXjFt7t3E9tYxJTSNWSmHVKpuWHPvHAxZUNvF3ddykpJHLb0kGT9 9Pi8Kc7L+47ZSFKFYZOsKDZKvRfRoWjJ3lslP/hRY1lmOJOvF8RmPRQ9Qklp4K3xGh5z oTmA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :list-unsubscribe:list-subscribe:list-id:precedence:date:message-id :dkim-signature; bh=ZsuwvNcy7srG22SEiNvqp25+3IIw8oPhoxlAvIGHUo0=; fh=iTcZoSspY48NjtZle/nfis98ujxS7COleVwSKN1l/Lo=; b=yG+OEesacI3XY8+kyQr6735SHfdxD3uUb7HYDmN/le9B40Fl4IfTgbYk35e4H5geSe tJ7eVRwEcJep1kLSddq+vkOr/avNt2uu3XmKVSEuAdmkecbPGkCmtrOO/h0G0RP81lph 6pSRvKK65z3Dfundf1b77L56ooLCp48mlio2PeH3/xt23JyOk7LhNPtQMaivNRtSLEoL bmBA8Mue4JrWoOcGZ+Spz1oHxm8f9RbhrDY9YFeWDlrlVZANI3En2BGZnprLm3EAM3r9 1i3qt1c5ZKIZpEZXn2/p9IRKsYIkKdRP1SgVIzo7V75UXwG4PG1g8QO3aUZe6h55XP9a HbCg==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=iR5qp22m; arc=pass (i=1 spf=pass spfdomain=redhat.com dkim=pass dkdomain=redhat.com dmarc=pass fromdomain=redhat.com); spf=pass (google.com: domain of linux-kernel+bounces-60119-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-60119-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com X-Forwarded-Encrypted: i=2; AJvYcCUsUVIoLv/hrjlD4UBCrZlDqMukQ8zGx+RJk5ImcxGXR8gDEZAw9OVYI+TboZ9u3FkEL2YvdMe8+GeUlNir7UBIUHZfWuQpU/G13uLH3Q== Return-Path: Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. [2604:1380:40f1:3f00::1]) by mx.google.com with ESMTPS id b185-20020a62cfc2000000b006e09edaf334si769073pfg.375.2024.02.09.15.03.35 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Feb 2024 15:03:35 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-60119-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=iR5qp22m; arc=pass (i=1 spf=pass spfdomain=redhat.com dkim=pass dkdomain=redhat.com dmarc=pass fromdomain=redhat.com); spf=pass (google.com: domain of linux-kernel+bounces-60119-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-60119-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sy.mirrors.kernel.org (Postfix) with ESMTPS id A0866B224FF for ; Fri, 9 Feb 2024 22:37:03 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 71B00374D4; Fri, 9 Feb 2024 22:36:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iR5qp22m" Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C6332653 for ; Fri, 9 Feb 2024 22:36:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707518185; cv=none; b=jl3ySYieWXQ19+hCQY91J2NIO0z0OFu4LURP/Wh/coJnWD8W9VU86QubkoED4qJbanA7J7EI8sUdLuGd6hDjHDsOol5Q5jxJpAHnvMGykIVbHpzZJAwubjXP8ZqWUnbKOhi5O3TMhfsvOcwNQwewgGE+scszwtrzGcq6L1HqDIc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707518185; c=relaxed/simple; bh=SfJHftGryZVlY1kWEXdfsgDfI4FHzlZzfxvhgdJqJiQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=cu5uBJWM/Ccy0FkmJDYS/C3h/kfgZfFuPhuawpvMNVRoyVa1Y+QC5OAqGf/ZBnXejWUdla1vENlhX6WRXf+52VL192Kex7k9MbPRd2zr1emZLpxx3T+2pUXJ41EugPGGSkdu7yHo1qdlJ9BTdAYNEEIOP+7LVTuDD+uK0c9ZgaU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=iR5qp22m; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707518182; h=from:from: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:autocrypt:autocrypt; bh=ZsuwvNcy7srG22SEiNvqp25+3IIw8oPhoxlAvIGHUo0=; b=iR5qp22mhmV9CuUKlWP/YO9bpl14GSBSxGdEekqU5an+qBVS/tr/GsIBE6tjW6kh9yFhwg 12CIlloYcqdjp3Bd6Vbz9J/906zcuCJX8Y81w26RBVitLAleul90ik3u0z4WjhUg/YEMqS oICIPtPkUnMHOTWh+57nZeik5rFkg/g= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-473-u585LpwCPzmkR6ILvXpZ1g-1; Fri, 09 Feb 2024 17:36:21 -0500 X-MC-Unique: u585LpwCPzmkR6ILvXpZ1g-1 Received: by mail-wr1-f71.google.com with SMTP id ffacd0b85a97d-33b51ae1c9dso523923f8f.3 for ; Fri, 09 Feb 2024 14:36:21 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707518180; x=1708122980; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ZsuwvNcy7srG22SEiNvqp25+3IIw8oPhoxlAvIGHUo0=; b=XSxwKwseXLRdCgrxhEH2OyZmwtr3GeI4Al5xQPB7xPvHkXQDKgQkBD2oRQrQIE7H2K K0+yueF8FWutpHNMA0hwvtRGAwQf1hConKbXYoft1IYoJAlGFvLxSysJF6SNxPWqufrv Z5HKmiXAbqnzX3ge6yL47mZ+5Bv4b4tRkMgM/ZVEFzV1z6cpNKz4D7sLs/N7FMt2N7oJ zR8klcfpkGRPgnaJqZCPUHDo/WB6+B+gmbx8Ruk88VpvdXXr4jRj+8qSA84vGL3GZRH+ 0hdGPszKJotia2UVZQshXwU7nsfpoAiX+aqIZk0xYLgfWGn3XlCG8Qo87Ruw/p0zSM4e Khtg== X-Gm-Message-State: AOJu0YwCuHSqHOL0fJLoa51muq7w84FFoM1hFGB9sUBFftuwmsf0iTBY EVEZjMw1HeTsDeliQmIUPEge4Iu9Glb5ECdkfr8t8Zvt/8FE+q1k9HoYJVKhxvVWYOP5Q5h8+oY 8EZT8z3nt3BnrU1px9z7sO1Tq7l/ao7d+ie1RiMzyGUJwtNeVyiYlQEMLTK8AaQ== X-Received: by 2002:a5d:6292:0:b0:33b:63a5:feaf with SMTP id k18-20020a5d6292000000b0033b63a5feafmr257845wru.20.1707518180232; Fri, 09 Feb 2024 14:36:20 -0800 (PST) X-Received: by 2002:a5d:6292:0:b0:33b:63a5:feaf with SMTP id k18-20020a5d6292000000b0033b63a5feafmr257824wru.20.1707518179877; Fri, 09 Feb 2024 14:36:19 -0800 (PST) X-Forwarded-Encrypted: i=1; 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 2vz249Brar3w0= Received: from ?IPV6:2003:cb:c718:6800:9d15:2b60:4f57:7998? (p200300cbc71868009d152b604f577998.dip0.t-ipconnect.de. [2003:cb:c718:6800:9d15:2b60:4f57:7998]) by smtp.gmail.com with ESMTPSA id bv4-20020a0560001f0400b0033b670b0a6asm302786wrb.74.2024.02.09.14.36.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 Feb 2024 14:36:19 -0800 (PST) Message-ID: <6b0d2c43-90cd-4429-baa9-078dd37fe207@redhat.com> Date: Fri, 9 Feb 2024 23:36:17 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 01/15] arm64/mm: Make set_ptes() robust when OAs cross 48-bit boundary To: Mike Rapoport Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Matthew Wilcox , Ryan Roberts , Russell King , Catalin Marinas , Will Deacon , Dinh Nguyen , Michael Ellerman , Nicholas Piggin , Christophe Leroy , "Aneesh Kumar K.V" , "Naveen N. Rao" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , "David S. Miller" , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org References: <20240129124649.189745-1-david@redhat.com> <20240129124649.189745-2-david@redhat.com> Content-Language: en-US From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 08.02.24 07:10, Mike Rapoport wrote: > On Mon, Jan 29, 2024 at 01:46:35PM +0100, David Hildenbrand wrote: >> From: Ryan Roberts >> >> Since the high bits [51:48] of an OA are not stored contiguously in the >> PTE, there is a theoretical bug in set_ptes(), which just adds PAGE_SIZE >> to the pte to get the pte with the next pfn. This works until the pfn >> crosses the 48-bit boundary, at which point we overflow into the upper >> attributes. >> >> Of course one could argue (and Matthew Wilcox has :) that we will never >> see a folio cross this boundary because we only allow naturally aligned >> power-of-2 allocation, so this would require a half-petabyte folio. So >> its only a theoretical bug. But its better that the code is robust >> regardless. >> >> I've implemented pte_next_pfn() as part of the fix, which is an opt-in >> core-mm interface. So that is now available to the core-mm, which will >> be needed shortly to support forthcoming fork()-batching optimizations. >> >> Link: https://lkml.kernel.org/r/20240125173534.1659317-1-ryan.roberts@arm.com >> Fixes: 4a169d61c2ed ("arm64: implement the new page table range API") >> Closes: https://lore.kernel.org/linux-mm/fdaeb9a5-d890-499a-92c8-d171df43ad01@arm.com/ >> Signed-off-by: Ryan Roberts >> Reviewed-by: Catalin Marinas >> Reviewed-by: David Hildenbrand >> Signed-off-by: David Hildenbrand > > Reviewed-by: Mike Rapoport (IBM) Thanks for the review Mike, appreciated! -- Cheers, David / dhildenb