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 D66ABC02193 for ; Tue, 4 Feb 2025 20:05:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6BD2E6B007B; Tue, 4 Feb 2025 15:05:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 66C596B0082; Tue, 4 Feb 2025 15:05:56 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4E5EC6B0083; Tue, 4 Feb 2025 15:05:56 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 2F5826B007B for ; Tue, 4 Feb 2025 15:05:56 -0500 (EST) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id E5DB4AD58D for ; Tue, 4 Feb 2025 20:05:55 +0000 (UTC) X-FDA: 83083343070.09.8D98634 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf28.hostedemail.com (Postfix) with ESMTP id 2F62CC0006 for ; Tue, 4 Feb 2025 20:05:53 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=SUa98RUf; spf=pass (imf28.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1738699553; 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=TG0VBOjtwhIY69XdWI0075eMKEZV/1x1lm+RtT6Fsec=; b=Tg+HG6tXtkZL+tH6K2+M6y4NqZ9WINc4PVt6cTGM9uBA0NlEYOqftVVg3Qg2bsrpC8f/7R xcNL6PHjwcnSWpBmca+5GxEwO84zv1P3r/zGLJFU17mhLpsIi8DrvK7NN09GgsVfK6anof 0bTtACZ4W/pcT9oXoB1FvQDSt5LKR9M= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1738699553; a=rsa-sha256; cv=none; b=BMpI41dnvYpNEjSwcJRKVgWl1eZRJUtkVS5RvxniqRvZfh/qgDOitZiydr/BNVT60xAnxZ U78vL4+C5+DXTQNfDLUL+UzbXNJ7sPm0iKuZUPbMbAE69VtQdJ90UdX3CBPK0bAuAV4mOL hkUeWkwH8OzAM1vRForz/Z0SaojvAxs= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=SUa98RUf; spf=pass (imf28.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1738699552; 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=TG0VBOjtwhIY69XdWI0075eMKEZV/1x1lm+RtT6Fsec=; b=SUa98RUf+m08n382zVx1eU3DQshMWrw8edaCmchB5AcDW2NBGjF1RLcakf63+Z1Lk+FZ68 GRqEa0hTCp+Fc8LjpZFexj/Tma0BBuTQU7cVT6gNoAq31VI+AZAG1fSdzRtpIsNPnNK3Gi HqALTc8KSwfxH7CThyem4cEJLNEAr3E= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-586-GBRegeToOeaLtqAhuWApBA-1; Tue, 04 Feb 2025 15:05:51 -0500 X-MC-Unique: GBRegeToOeaLtqAhuWApBA-1 X-Mimecast-MFC-AGG-ID: GBRegeToOeaLtqAhuWApBA Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-43623bf2a83so47791865e9.0 for ; Tue, 04 Feb 2025 12:05:51 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1738699550; x=1739304350; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from: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=TG0VBOjtwhIY69XdWI0075eMKEZV/1x1lm+RtT6Fsec=; b=G7RZBqTfdAHM3wC+HZtDSDhlJKHiA/MFSMEeq3CEuvrD21WheEqgbTxgE60KlLXelg NJ3cDpwvEB4+lPC/Nvy37GPM9e/M0rwCQdjXv2QNhl1V93hZfqKLx+8GEqvyh/dAiWgZ ixQcir8T+TVZQLAnXW2Sf/LMBHeVEQa3JBlHwHrG6XiYo0CHsKcVWizJoF5v4Z8eec7v SanbplZWKtnH9UF6rX7r25JxZjcCOxfwzhl0FAlJ1RbWx7R81xZ1VitZJHU7q6/y5HV9 3GBVTAzI+Nn8LiPsAk287ClvW6+cPJrJpID2lyQn6wU5YwRmc9ttRC46yWC5KViuCOoq Wyww== X-Forwarded-Encrypted: i=1; AJvYcCUU0hsPteusd2HOzieip547DkeypS60wWBw4E4vYRuA7nvM1Ck4/G2D2M6/GAXknczVPs0V/nhbUQ==@kvack.org X-Gm-Message-State: AOJu0YwcTl09k6yNcingEbHi0YeuKN0/vAauQTQVqUtFuEyoVhIOHuYN UKvaNFPGT2G5E29+krMeZfWoSYnpaUvNjyX6x6cNPLPk8UJMMXo3clCXCcFmrCA2OIYI+Ekn1Jz 4g32lZKkRL+uNmfGXHQ70IFyzkB9FkLUbXEEBfO+T3z39P+tB X-Gm-Gg: ASbGncvJReEl5/GyHXEPzUCRmuYjIj2iCxwqbfw8LcXBvPfCtLwEKxX1Af9CDgWIMcp uM6R/HrgR7tCgEGaV6nHtPcW2kCdz5M5K3Q3zgxi6le6tHL5aSpD5vvSt/bmRa4eGiKBsfW7veD L3190Kf1aVL57CsoUEQWZpR1zCqH885blzmZKrU31hvOePmQrdpnzcSUkYUoY7tJPOqtlix5mkx 8MdjgMfj79A9IYVs9qcK6Po+HN9IFelnWY59RZIf70mVARRyfMCHZGbdG5Hg/5PbdBgzOF+DecQ KLsoojrW5I96ivPpNZQqUu5yyTmtkYkCs0dFFY138/Gj/026wONm2mVra077z+LWBjA5SsPehrZ eybOvf+a9wAcae3JlobzGM0l9Ocw= X-Received: by 2002:a05:600c:1c1e:b0:432:7c08:d0ff with SMTP id 5b1f17b1804b1-438dc40b8e6mr219447585e9.23.1738699550203; Tue, 04 Feb 2025 12:05:50 -0800 (PST) X-Google-Smtp-Source: AGHT+IHl0e1PfrO/acX8KQ8HrvISVvYQxN7zWLjFZBtvwxXbc2Stz1EA3DpEu6vsB8sdtfjDtXs5tw== X-Received: by 2002:a05:600c:1c1e:b0:432:7c08:d0ff with SMTP id 5b1f17b1804b1-438dc40b8e6mr219447295e9.23.1738699549830; Tue, 04 Feb 2025 12:05:49 -0800 (PST) Received: from ?IPV6:2003:cb:c70a:300:3ae1:c3c0:cef:8413? (p200300cbc70a03003ae1c3c00cef8413.dip0.t-ipconnect.de. [2003:cb:c70a:300:3ae1:c3c0:cef:8413]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-438dcc80e61sm239135565e9.34.2025.02.04.12.05.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 Feb 2025 12:05:49 -0800 (PST) Message-ID: <1d379007-97c3-4bb9-93da-1a828f955fc4@redhat.com> Date: Tue, 4 Feb 2025 21:05:47 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] rust: page: Support borrowing `struct page` and physaddr conversion To: Jason Gunthorpe Cc: Asahi Lina , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Jann Horn , Matthew Wilcox , Paolo Bonzini , Danilo Krummrich , Wedson Almeida Filho , Valentin Obst , Andrew Morton , linux-mm@kvack.org, airlied@redhat.com, Abdiel Janulgue , rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, asahi@lists.linux.dev References: <20250202-rust-page-v1-0-e3170d7fe55e@asahilina.net> <1eaf66ba-b2d3-448f-938b-913f17ca98a4@redhat.com> <20250204183933.GJ2296753@ziepe.ca> 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: <20250204183933.GJ2296753@ziepe.ca> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: RI0ZQIw0yso4E5dYP753xVRltzeP_JLowMhjL6PBS84_1738699550 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 49o4js8xbe6r9ps8cjxp1zzk7dbwznpp X-Rspamd-Queue-Id: 2F62CC0006 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1738699553-523791 X-HE-Meta: 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 UU88a0r9 mUHtDqxLWIYt8urUbzVdLCYFULg8FMymufjGiwNzzlSOU1ulWvQdh1QhqtwLORO8Jgq1PDnpm0Y4T4vowqxw7nfA0ZdfJRj2zvwfwlKxb1prJJOwHsXfGbXUJ8HWPMRWh48ZaUEAAbXUuBjeDId6vormwQ6Y+uRiMZKnRTExaD9/0OZMDhmjqeatmSXNY+GBfwYatbDFXeZAMzlCkQg188NG3F3hAdkuSlBl7/AXlSviuDlZGH4ve+u61m+BLgrMPKpiCvHGpfZbGOyHJlbU75PH1+0DGVfqxDWcngq9ITHXdlXyhlOwwNz8FUdG8+FL8a+nAADkppcNdIIuJlms18RXmLDqMO/ggVgyfkgVBzaseUQ/Me0nEQjMsHXL6nxyX9Wm0HQ9okaYYU8DT0fCE/tIcQXkywv8aU23+GoRRQ5Qkcr0YSGMngu77CssufC3fbaFLUhrMH2wCN5xl04ZllCeeWFsCk4nYhOtiFkW+Uqw95NhP1lUjJ7+S3mJxwhPbTbTtYeF4IK02Yu8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.390343, 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 04.02.25 19:39, Jason Gunthorpe wrote: > On Tue, Feb 04, 2025 at 11:33:24AM +0100, David Hildenbrand wrote: >> On 03.02.25 10:58, Simona Vetter wrote: >>> On Sun, Feb 02, 2025 at 10:05:42PM +0900, Asahi Lina wrote: >>>> This series refactors the existing Page wrapper to support borrowing >>>> `struct page` objects without ownership on the Rust side, and converting >>>> page references to/from physical memory addresses. >>>> >>>> The series overlaps with the earlier submission in [1] and follows a >>>> different approach, based on the discussion that happened there. >>>> >>>> The primary use case for this is implementing IOMMU-style page table >>>> management in Rust. This allows drivers for IOMMUs and MMU-containing >>>> SoC devices to be written in Rust (such as embedded GPUs). The intended >>>> logic is similar to how ARM SMMU page tables are managed in the >>>> drivers/iommu tree. >>>> >>>> First, introduce a concept of Owned and an Ownable trait. These are >>>> similar to ARef and AlwaysRefCounted, but are used for types which >>>> are not ref counted but rather have a single intended owner. >>>> >>>> Then, refactor the existing Page support to use the new mechanism. Pages >>>> returned from the page allocator are not intended to be ref counted by >>>> consumers (see previous discussion in [1]), so this keeps Rust's view of >>>> page ownership as a simple "owned or not". Of course, this is still >>>> composable as Arc> if Rust code needs to reference count its >>>> own Page allocations for whatever reason. >>> >>> I think there's a bit a potential mess here because the conversion to >>> folios isn't far enough yet that we can entirely ignore page refcounts and >>> just use folio refcounts. But I guess we can deal with that oddity if we >>> hit it (maybe folio conversion moves fast enough), since this only really >>> starts to become relevant for hmm/svm gpu stuff. >> >> I'll note that in the future only selected things will be folios (e.g., >> pagecache, anonymous memory). Everything else will either get a separate >> memdesc (e.g., ptdesc), or work on bare pages. >> >> Likely, when talking about page tables, "ptdesc" might be what you want to >> allocate here, and not "folios". > > I just posted a series to clean up the iommu code that this is > cribbing the interface from: add an ioptdesc, remove all the struct > page from the API and so forth: > > https://lore.kernel.org/all/0-v1-416f64558c7c+2a5-iommu_pages_jgg@nvidia.com/ > > I strongly suggest that rust not expose these old schemes that will > need another cleanup like the above. Page tables just need an > allocator using simple void *, kmalloc is good enough for simple > cases. > > Drivers should not be exposing or touching struct page just to > implement a page table. Fully agreed, this is going into the right direction. Dumping what's mapped is a different story. Maybe that dumping logic could simply be written in C for the time being? -- Cheers, David / dhildenb