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[2003:cb:c706:2700:abf9:4eac:588c:adab]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4405b53ef95sm42347205e9.36.2025.04.17.00.14.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 17 Apr 2025 00:14:56 -0700 (PDT) Message-ID: <3e1f2046-0018-43c2-b2c6-2c8265dbbf5f@redhat.com> Date: Thu, 17 Apr 2025 09:14:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Invitation] bi-weekly guest_memfd upstream call on 2025-04-17 To: Chenyi Qiang , "linux-coco@lists.linux.dev" , "linux-mm@kvack.org" , KVM References: <971a3797-5fc4-4c7f-a856-dca05f9a874e@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: 8p0EESvhXQvS2QvxbcUaCvE3u3BAxhYfhvL0roveIpk_1744874097 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: tbb3dcya1myp9rpiuwjpzxbzrb6mfnyj X-Rspamd-Queue-Id: D45B54000B X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1744874102-98513 X-HE-Meta: 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 KncPkiWa 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000412, 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 17.04.25 04:46, Chenyi Qiang wrote: > > > On 4/16/2025 7:58 PM, David Hildenbrand wrote: >> Hi everybody, >> >> our next guest_memfd upstream call is scheduled for Thursday, >> 2025-04-17 at 8:00 - 9:00am (GMT-07:00) Pacific Time - Vancouver. >> >> We'll be using the following Google meet: >> http://meet.google.com/wxp-wtju-jzw >> >> The meeting notes can be found at [1], where we also link recordings and >> collect current guest_memfd upstream proposals. If you want an google >> calendar invitation that also covers all future meetings, just write me >> a mail. >> >> >> If nothing else comes up, let's talk about the next steps to get basic >> mmap support [2] ready for upstream, to prepare for actual in-place >> conversion, direct-map removal and much more. >> >> In particular, let's talk about what "basic mmap support" is, and what >> we can use it for without actual in-place conversion: IIUC "only shared >> memory in guest_memfd" use cases and some cases of software-protected >> VMs can use it. >> >> Also, let's talk about the relationship/expectations between guest_memfd >> and the user (mmap) address when it comes to KVM memory slots that have >> a guest_memfd that supports "shared" memory. >> >> >> To put something to discuss onto the agenda, reply to this mail or add >> them to the "Topics/questions for next meeting(s)" section in the >> meeting notes as a comment. >> >> [1] >> https://docs.google.com/document/d/1M6766BzdY1Lhk7LiR5IqVR8B8mG3cr- >> cxTxOrAosPOk/edit?usp=sharing >> [2] https://lore.kernel.org/all/20250318161823.4005529-1- >> tabba@google.com/T/#u >> > > Hi David, > Hi, > If we have time, I'd like to discuss about my v4 posting of shared > device assignment support > (https://lore.kernel.org/qemu-devel/20250407074939.18657-1-chenyi.qiang@intel.com/) > which introduces a new abstract parent class of RamDiscardManager, and a > new priority listener to apply to in-place conversion. Hope to get some > suggestion or confirmation if I'm in the correct direction. yes we can discuss that (and it's on my todo list as well to review). I suspect that it's mostly review that's missing at that point, and that it is conceptually ok. Interestingly, I might be looking into virtio-mem support for confidential VMs at some point; I'll have to figure out how to allow for more states then :) -- Cheers, David / dhildenb