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[2003:cb:c72a:da00:e63f:f575:6b1a:df4e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4366127c488sm163896265e9.27.2024.12.24.03.27.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 24 Dec 2024 03:27:35 -0800 (PST) Message-ID: <82c53460-a550-4236-a65a-78f292814edb@redhat.com> Date: Tue, 24 Dec 2024 12:27:33 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Invitation] bi-weekly guest_memfd upstream call on 2024-11-14 To: Alexey Kardashevskiy , Chao Gao Cc: linux-coco@lists.linux.dev, "linux-mm@kvack.org" , KVM , Fuad Tabba References: <6f2bfac2-d9e7-4e4a-9298-7accded16b4f@redhat.com> <08602ef7-6d28-471d-89c0-be3d29eb92a9@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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: ZyOjmeDdYnytWQYqM0od5p0jacIynh6-G8mC-5pyQy8_1735039656 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: DA40D1A0008 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: 6tkq4w6mewugm1hwdhsdr6u361rwibuz X-HE-Tag: 1735039618-976066 X-HE-Meta: U2FsdGVkX1/vHg1lrUA3PtYIBcNGS+BQMhnE8bBYsg3MyB2qtfXhUInphZFfnJx10hfSElYOqjXcU47E/LTgsJ2O5ySi54UlpTxV7ViiJec9FAwZTAclVSRj1QfQgek8m/l4kQ/0OCef/J5CwQBhaAfBGMDVIo8f1Y/PFG60N45J586jwdxHbJQstbVZd+x1YcwLImD5mDSsfSmlpZZNr+6gTQtmY0FnpdDyq3GSkbcDXqpCdmKw0L+h3avX//GcV378A96pwCmsJfW/Zgq3rHQ5gB9gxukGdWJGbgp+P1nXuu7j2eOeATnew1LucbMQ88nPd5bw5QJQEZCeSG3J060kaZIj5WMXpN9F0npWgxzj8nntgCBLRAZ6B46bSQnBUONcZZEo4CPPI5vRa6tCSQ8NtcQowXblgXphdwsAWrBwEZ1IxZCuSWByt15ILxJzHGofNPDRUqt7NYPMpHgIT45S/XIpQEgaY7yu1nGwIikM78Y2qfCe7hatCGhAhVgOjg8jz79Q78SLGGE6KACrRbytWUkadiW6OIKFVoq5ljRKM6QpeON6Vrf+dbwnJ+084Gl4Y4ze61RCmH6wpoR4N070cTSRyuj17cxZ0gfxPJKn1WG0ZgNcW+k2JyTtLpYeFjvDQzQQwS8dK+iKd22N+OLl8UMlwChULCLBG2Yq0hSb4lo8w/7EUTIiTz1GWuv7NG1lfNAzRBHZ//DIRxHXiMM1/1TzduZhAnjAivcrLMT7aqgwbPnEXPb4yyWy94m48xoQm3MUZJDogsjdcLvLV4Sz0mqQgMNanxfHECWMytEiVt2yhOu93AVSIPhgY62hGONrCSvHCxSCOdnTIMuKKSw8rUROklJx1qw7QsJwph94Vmz3cP0TiOwF7oa1UP9D3+R05gIhzjrar7+fTkJm3rUXPgpWylKGrhXu/KiRDXnODDG23xESdPeT8mKXDbIqzh1kzBZFDWlvl7FoalF UWb7aI1S 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001287, 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 24.12.24 05:21, Alexey Kardashevskiy wrote: > On 14/11/24 13:27, Chao Gao wrote: >>>> With in-place conversion, QEMU can map shared memory and supply the virtual >>>> address to VFIO to set up DMA mappings. From this perspective, in-place >>>> conversion doesn't change or require any changes to the way QEMU interacts >>>> with VFIO. So, the key for device assignment remains updating DMA mappings >>>> accordingly during shared/private conversions. It seems that whether in-place >>>> conversion is in use (i.e., whether shared memory is managed by guest_memfd or >>>> not) doesn't require big changes to that proposal. Not sure if anyone thinks >>>> otherwise. We want to align with you on the direction for device assignment >>>> support for guest_memfd. >>>> (I set aside the idea of letting KVM manage the IOMMU page table in the above >>>> analysis because we probably won't get that support in the near future) >>> >>> Right. So devices would also only be to access "shared" memory. >> >> Yes, this is the situation without TDX-Connect support. Even when TDX-Connect >> comes into play, devices will initially be attached in shared mode and later >> converted to private mode. From this perspective, TDX-Connect will be built on >> this shared device assignment proposal. >> >>> >>>> >>>> Could you please add this topic to the agenda? >>> >>> Will do. But I'm afraid the agenda for tomorrow is pretty packed, so we might >>> not get to talk about it in more detail before the meeting in 2 weeks. >> >> Understood. is there any QEMU patch available for in-place conversion? we would >> like to play with it and also do some experiments w/ assigned devices. This >> might help us identify more potential issues for discussion. > > > Have you found out if there are patches, somewhere? I am interested too. I remember that so far only Kernel patches are available [1], I assume because Google focuses on other user space than QEMU. So I suspect the QEMU integration is still TBD. [1] https://lkml.kernel.org/r/20241213164811.2006197-1-tabba@google.com -- Cheers, David / dhildenb