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[2003:cb:c74b:ca00:4ca2:ff2c:9092:f070]) by smtp.gmail.com with ESMTPSA id b1-20020a05600c4e0100b00405959469afsm16528751wmq.3.2023.12.12.04.15.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Dec 2023 04:15:21 -0800 (PST) Message-ID: <9a5584df-23df-4a3c-a6a5-fd1554250b0d@redhat.com> Date: Tue, 12 Dec 2023 13:15:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 0/6] mm/gup: Introduce memfd_pin_folios() for pinning memfd folios (v7) To: Vivek Kasireddy , dri-devel@lists.freedesktop.org, linux-mm@kvack.org Cc: Christoph Hellwig , Daniel Vetter , Mike Kravetz , Hugh Dickins , Peter Xu , Jason Gunthorpe , Gerd Hoffmann , Dongwon Kim , Junxiao Chang References: <20231212073803.3233055-1-vivek.kasireddy@intel.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: <20231212073803.3233055-1-vivek.kasireddy@intel.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-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 237B24000A X-Stat-Signature: 13z36qyf413utqkh8spuibakzgqwj7hd X-HE-Tag: 1702383326-443079 X-HE-Meta: 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 C9p5xR1U 9/+Po7hQyi5fJlPh3MnPlAKc37m3+WYK35c6VuQm2N7jkQUaFv2uSvhrZ+N1j+8AR24bF5s33cqhdhl49lqOSBBJVhfLc/Ilge0vF33nsUmiZvO07K++BEWQRfobGJqNBCfvFS2Nz5RcvILS0+UtXFQ2N1VQIWseLUpAzyXz9h472uJ2WwFfLIytuVuW4LBd0Zm9alOLwGTMlEvzqxJzRTltZmbJp1QHgoNcS/TY7NzSjN30Yxh3E76YRFB1XUP3hffbFanOGcqpxQtp18rXb5KHZwtpEfH8ZhqeKB7FGFGtTW24YKzpZ1P29vjjUZcSNRxWJFX83X6TFZAD9ylYVg4d01tIPTF0NI3wJXK3Elc9UC2BW5qVdcXGReIKYNiQYha6aNipvFsNLsYV6rgAFuHCwf04h5VIer8uzh1jFko5gqmvfvg/oht9J9yvrUHhuKi4qtzI03w1RAQRtBhLn//wOwyUZ2L0Q4WhgVHiatMu0nhAvjhBJkYeRaA== 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 12.12.23 08:37, Vivek Kasireddy wrote: > The first two patches were previously reviewed but not yet merged. > These ones need to be merged first as the fourth patch depends on > the changes introduced in them and they also fix bugs seen in > very specific scenarios (running Qemu with hugetlb=on, blob=true > and rebooting guest VM). > > The third patch introduces memfd_pin_folios() API and the fourth > patch converts udmabuf driver to use folios. The fifth patch shows > how the udmabuf driver can make use of the new API to longterm-pin > the folios. The last patch adds two new udmabuf selftests to verify > data coherency after potential page migration. > We should probably get started with the first two patches, they are independent of the remaining discussion regarding memfd_pin_folios(). -- Cheers, David / dhildenb