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[2003:d8:2f1a:3700:2982:b5f7:a04e:4cb4]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a568b09148sm3100825f8f.58.2025.06.13.11.03.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Jun 2025 11:03:33 -0700 (PDT) Message-ID: Date: Fri, 13 Jun 2025 20:03:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/5] vfio: Introduce vfio_device_ops.get_unmapped_area hook To: Peter Xu , linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org Cc: Andrew Morton , Alex Williamson , Zi Yan , Jason Gunthorpe , Alex Mastro , Nico Pache References: <20250613134111.469884-1-peterx@redhat.com> <20250613134111.469884-5-peterx@redhat.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: <20250613134111.469884-5-peterx@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: iKb0kync76oX71dI2AZGk0b-GEENit4bR-1migutvT8_1749837815 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: 019541A0018 X-Stat-Signature: 8ofrcedzmda3ebc78gmee7nrnqkrkgwx X-Rspam-User: X-HE-Tag: 1749837821-855613 X-HE-Meta: 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 DMGTJh8L 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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 13.06.25 15:41, Peter Xu wrote: > Add a hook to vfio_device_ops to allow sub-modules provide virtual > addresses for an mmap() request. > > Note that the fallback will be mm_get_unmapped_area(), which should > maintain the old behavior of generic VA allocation (__get_unmapped_area). > It's a bit unfortunate that is needed, as the current get_unmapped_area() > file ops cannot support a retval which fallbacks to the default. So that > is needed both here and whenever sub-module will opt-in with its own. > > Signed-off-by: Peter Xu > --- Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb