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 EA4EBC49EA1 for ; Tue, 6 Aug 2024 13:48:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4DB9F6B0085; Tue, 6 Aug 2024 09:48:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 48B376B0089; Tue, 6 Aug 2024 09:48:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2DE6C6B008A; Tue, 6 Aug 2024 09:48:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 0EDF96B0085 for ; Tue, 6 Aug 2024 09:48:28 -0400 (EDT) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id B614DC0194 for ; Tue, 6 Aug 2024 13:48:27 +0000 (UTC) X-FDA: 82421950254.12.4700AC8 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf14.hostedemail.com (Postfix) with ESMTP id D45B0100007 for ; Tue, 6 Aug 2024 13:48:23 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=JvbCcLFy; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf14.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1722952053; a=rsa-sha256; cv=none; b=ohhtfCusLDwmD6Q4F1lrx0qB9Gjf5LbryajPVHJHNqaoTbVi1MdzDOW7DecyIeMMJH1ws5 JV0HnzQDZ2DTRlwzMg9AltXs3rSA8hnUJ0+89Wop4lJ410lcoso74BVvoNtvZNzMfnFKU8 gdv2vG81JtqzDnmJSnXEeU5B+IyKeyY= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=JvbCcLFy; dmarc=pass (policy=none) header.from=redhat.com; spf=pass (imf14.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1722952053; 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=gtpU5qSprfJ+UldEW+4kFQXg1kf7NdDamMPmiVRXcoY=; b=pzX/eEkXKkK2s6kcDjkWbg0dv+rS4YIKddEdbfxNYduKK3J3PG7cpf2DIVRShgGWF9dmVA tPXixeVWyyiEVrc0ZlJJlSIghSORCXR43WcwirIeuz/pzei2HuqA4WRPcHpimlqFn3dNIe 3gpVv0xoFkRc5YBEvgWWaQlw6dZXI0U= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1722952103; 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=gtpU5qSprfJ+UldEW+4kFQXg1kf7NdDamMPmiVRXcoY=; b=JvbCcLFy45H9oRclbDwKkFIbV833D9Kb1KM2R3M2ouuQiZbKbeUXgX+IxQWfZVByE9Wucl IFtL9EcHEHaNJh462oxmoj9jaXuJtdfAcgOh+2a6YnyOy8X8+dfiHV7K7EZfOfo0wbXc/R xpgYHc1A150uthtFQDavn2LPCqfeIzk= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-675-RAZnz6NkPaWnM-RdJynXQw-1; Tue, 06 Aug 2024 09:48:21 -0400 X-MC-Unique: RAZnz6NkPaWnM-RdJynXQw-1 Received: by mail-wr1-f70.google.com with SMTP id ffacd0b85a97d-36832c7023bso358654f8f.2 for ; Tue, 06 Aug 2024 06:48:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722952101; x=1723556901; 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=gtpU5qSprfJ+UldEW+4kFQXg1kf7NdDamMPmiVRXcoY=; b=LlJdLpqaUNdwiefo4+FuUDlHQJf0uo5Jp1l4vfomfYIlm6K1HgNo0NSWD6GBT0xdLb zEDLyE7tPlbFtTrGYk9q1uD/XltVT9hBGmA4aXoG0NXpqIo6iahGW4A2MzcAo7zeOrrz Lhs6+qqLzKCLFo2X8Nw60xuaEqcOFaYGl0cHbj9lvR+FAhMIyJYObYSSkgX5uptD2lhS +Bi/TIgkllDdEM65ZvdZ+Elmr0ejj3TUYmTGqZCS/lvhBktfYIsAY4MU3eoSEsMhb+mu WyyFrarMo4fPr8nLSUQxBXF38CQKckjtfNGA4FtVHSidUBZ/MSPCYKqOu/+4CUrRPzTS 74TA== X-Forwarded-Encrypted: i=1; AJvYcCXsnMzTnAAJ2SQ2B0GagLjrDp6uD7R4ufo1vg0+rFMKeRgWhgH/fBQbnIt0sKBFNw/dOKEbWJ8tCh7oQm/LjH0yChk= X-Gm-Message-State: AOJu0YwI9Rk34CkZBSOGV14cbxifJX5PqKJOE2Vr1o5EnX3Nv/pTZxNL yqEPXagECT6VyXcPR6DRKadaFVi9HDd1Mq6qawg4t+c5enVPVjBnTaTdY9hMDRNvdeBwvdhe5dZ ITCO4tqucqdj6a1wdFcnDT2jI/KWWwTP8yo1k4NYOSJLgAd8B X-Received: by 2002:a5d:464b:0:b0:367:8e18:535c with SMTP id ffacd0b85a97d-36bbc14f832mr11022296f8f.43.1722952100704; Tue, 06 Aug 2024 06:48:20 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGPRXCbw4R3JVze/f37dPQWjpfsvw8RLVk7FJ++mKPigRKg6a0Bo+6mw0dqBpIa26xORe/xBA== X-Received: by 2002:a5d:464b:0:b0:367:8e18:535c with SMTP id ffacd0b85a97d-36bbc14f832mr11022274f8f.43.1722952100155; Tue, 06 Aug 2024 06:48:20 -0700 (PDT) Received: from ?IPV6:2003:cb:c73f:8500:f83c:3602:5300:88af? (p200300cbc73f8500f83c3602530088af.dip0.t-ipconnect.de. [2003:cb:c73f:8500:f83c:3602:5300:88af]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36bbcf0cc58sm13109166f8f.2.2024.08.06.06.48.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 Aug 2024 06:48:19 -0700 (PDT) Message-ID: <03db8091-d563-402b-9eec-ad36a364e5d9@redhat.com> Date: Tue, 6 Aug 2024 15:48:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 1/4] mm: Introduce guest_memfd To: Elliot Berman , Andrew Morton , Paolo Bonzini , Sean Christopherson , Fuad Tabba , Patrick Roy , qperret@google.com, Ackerley Tng Cc: linux-coco@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org References: <20240805-guest-memfd-lib-v1-0-e5a29a4ff5d7@quicinc.com> <20240805-guest-memfd-lib-v1-1-e5a29a4ff5d7@quicinc.com> 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: <20240805-guest-memfd-lib-v1-1-e5a29a4ff5d7@quicinc.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: D45B0100007 X-Stat-Signature: agpg67r85spxyy5pqdjxf1kfkt8ismn7 X-Rspam-User: X-HE-Tag: 1722952103-251815 X-HE-Meta: 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 YYyUUW4k 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 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 05.08.24 20:34, Elliot Berman wrote: > In preparation for adding more features to KVM's guest_memfd, refactor > and introduce a library which abstracts some of the core-mm decisions > about managing folios associated with the file. The goal of the refactor > serves two purposes: > > Provide an easier way to reason about memory in guest_memfd. With KVM > supporting multiple confidentiality models (TDX, SEV-SNP, pKVM, ARM > CCA), and coming support for allowing kernel and userspace to access > this memory, it seems necessary to create a stronger abstraction between > core-mm concerns and hypervisor concerns. > > Provide a common implementation for other hypervisors (Gunyah) to use. > > Signed-off-by: Elliot Berman Instead of "Introduce guest_memfd" and "Convert to use mm/guest_memfd", I suggest a single patch that factors out guest_memfd into core-mm. Or is there any particular reason for the split? -- Cheers, David / dhildenb