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[2003:cb:c719:8200:487a:3426:a17e:d7b7]) by smtp.gmail.com with ESMTPSA id q12-20020adfcd8c000000b00343cad2a4d3sm19234353wrj.18.2024.04.25.02.36.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Apr 2024 02:36:38 -0700 (PDT) Message-ID: <20493de7-9367-4453-84c4-23d2db1b5986@redhat.com> Date: Thu, 25 Apr 2024 11:36:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: kmalloc() question - migration/remap of kmalloc()'ed pages To: Mounesh Badiger , linux-mm@kvack.org References: 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: 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: 8bit X-Stat-Signature: m37zog7rmo7rbbnoq8wfmb9cz7ri4z7c X-Rspamd-Queue-Id: 4428A40006 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1714037803-856541 X-HE-Meta: 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 IYDSxDVY OKwpgwbubhdiD/Dqw55Xz/dQVQS8wg/1AtCCIvJqdDq1SgP7wdEYu8XxM8kEHkNDabNHXuNp1HSC9OfqCYJbg6GyIDDDZiPYxcPZ7a4EvfCwVH/N3U1UVvPN51cEJim7n0DYYIfsG5PkplVlQOzC+03Nw5/M6nwb86CJZ/XePXTPg8y+HHOEM18raV9YB7y2WKjYZ4LZ6URIsjZAq3K58g+pDua1Vmy5KPDWRBtv4eGr1O6Gfa/sjB7nJT2wJpVeoWvnFKeKpb6NYYHx9lxJkK8pKdRl/ZFQ24K1zhWG6/REiHrwQzx4bIGnkAEC5k/YSKirNdcNBBneDgYTtYX5+5l0Ez79u3tU/3lHU0QcT0Yj1dY/44smAtGmehFy09PJ2T/BiduOO5p8LLX6n1CCWhZ0DSlRL7m7NIZgntzbykJv7Dnlle9sqHeaQCDBkikoKbq8mIbCEMI+eflcR3fFGa3+XwlQuZ6fE3m/3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, 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 25.04.24 11:21, Mounesh Badiger wrote: > Hi, Hi, > > We have a device driver that allocates physical pages using kmalloc() > and these pages are mapped to the userspace process via mmap. Which interface are you using for inserting these pages into the page tables? remap_pfn_range? vm_insert_page() ? ... Using kmalloc sound weird ... why not simply alloc_pages()? > > Does the kmalloc()'ed memory mapped to userspace can migrate or get > remapped due to any of kernel mm operations? No. > > we are looking to keep VA->PA mapping intact from a > userspace process point of view. That will work. -- Cheers, David / dhildenb