From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D6B19215197 for ; Thu, 17 Apr 2025 07:15:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744874103; cv=none; b=q+2feTFVN374nPNBzXBxfWuzKL+Ug9c/+qmI4I0SmhjM0qAGPBS2TSMMo/ZqQu8sseW16QaTKJQ8+n3eaihBzjrdd7VMEWonne612Uq9Z71xVQgwONlmiaVYqXLzjfCCkGiUsgp+W4WYkfb51AiIXeHBk3iHQS2b1zNiX2eG79c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744874103; c=relaxed/simple; bh=qKfREfq8cLs0YcBclGpbd1/aUBbAGsvNb2nH0iQaPaI=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=JHQ8NoyvQUecGCM8vTyKmrx09ayybDlm9HcCJ8nVS6D+7kAhyYLSvRiVqGfTQ11WDBTIAFYAqQ0yzhox2ksKIiwCj7UM3pTDWFNzANb/YMI4Ej/h8IYE8naDApIvzWthX4ZNbRd3F5c+SL/79aPH93u3fNFd7TrXJwHr19iLrq8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=AayWlqt3; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="AayWlqt3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1744874100; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=51dhjsjLR1Xu8v8vrTdI7zY3jGAvHFHPmWKyU7AoQ4c=; b=AayWlqt3/nJZlyO+tJIesal+MV1WdBx8x/oVOD80NDo4eO81+oDh7r3U2uGOEU+K9Wcq1y 4fA82lVcTDTcrNiWqrZ9bhyHDiZzN5+e48b2el4InTCx7totIIRZa4MOqLfqSKbx/9FYjI M42Aia8ynIEr+WFU4BhOZZKnjDcYn2k= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-235-Na6fjyOPNTmrvZbvgCd6cQ-1; Thu, 17 Apr 2025 03:14:58 -0400 X-MC-Unique: Na6fjyOPNTmrvZbvgCd6cQ-1 X-Mimecast-MFC-AGG-ID: Na6fjyOPNTmrvZbvgCd6cQ_1744874097 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-43d0830c3f7so2871185e9.2 for ; Thu, 17 Apr 2025 00:14:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744874097; x=1745478897; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:to:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=51dhjsjLR1Xu8v8vrTdI7zY3jGAvHFHPmWKyU7AoQ4c=; b=MDcfByyEMz0Vwjk+VkWT/RdiD/i/W8QzkuBpyvkHoQ/U03tW2EGYKhglp2m4Sa3Fbz MFFj04FzFWW9x6T1V6kaZCmD1yh0NDUg5Ut/Fa95AL3ytR5gH+0ImJ/eMuQPPM3HHypd eleJdYeoIGPSO+dOPmZyf/EYZgF5qH8yGg4CAXpeBpV9XbJwit2JSd61MC7pFi0HwsEh dYK5TlvCsMfY65E1+bmYzjuTQrJFEOD+5J6BapMy+knKP52i9qyH98iNnHwlUf0/42C9 PwgiSUSR3pRO6KdkcL4AbaC1oYvDXCedwrE9vE49ySrJiexQFAiD0azHRsIz4W7Kmhin 2CxA== X-Forwarded-Encrypted: i=1; AJvYcCWZe2wwHSWsqgwSSNL3Bpjni7OKQO48eSnWetg0reKReTbU8SL6dEW/TC1NP9eOwmqqxUiyTadambH2@lists.linux.dev X-Gm-Message-State: AOJu0YzAduROXf0M4nueErO9ZxLjmI3n3WJKkiFcWIYtzgunDBZAdFD6 q88QxtrnxZPKFieqiCT9k15E8BP/ZsPd2dwqinZTk8yeL5KLJDoAykxXvx7fplIFasu/0YSR+Ne 78xvWRQXXuurspmESpcnS28yZgzjxc4lpIJWJ5fAjyuPZA7LHqZK6LoP8HJw= X-Gm-Gg: ASbGnctbn0hnGfc7V6eMiWefrCsGEALWgBQ7ncpeTItzGze8tRQj49Nzlk3Xo+f7uFJ 1gYq6YgrZZDEFtRC+2xhsgodZfPqT3OZe6Avgs0b/ewc/DMlWunoYHgw92CP+kHTTUsr7ZqEgXs pGA5tU34s+KQ+R5S6bdGjdPajPLAJ5yiRHmeZ3dAm68ycEKqjdvm0QwBGV/u22SCp36KhNO1lr2 R0bZDr1QIFdpTnRIxnJS87+ZJKEPLpG1si8pYP3fhHnoe+vS79kD8t3AgzRM0PtmY/YZwUiGm4I PmeVAYaQPpsHT79kA2H1WmolXD+6LlZLW3WIbi79iQ7+kGpoME6C2cEMdZie/S8/G5ET5hg2q+Y d5ybgvHV2T0nSwq85+egH6ZO224HvSwc+zLl+4+o= X-Received: by 2002:a5d:588d:0:b0:391:47d8:de25 with SMTP id ffacd0b85a97d-39ee5b8b992mr3863357f8f.41.1744874097358; Thu, 17 Apr 2025 00:14:57 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH/eQTys4+DfbYoPnzh2pEwpGmYVx0ykrkqQmgHQPSTakOo4T0T0bnb+BxnUPUGlE6+rVqnWQ== X-Received: by 2002:a5d:588d:0:b0:391:47d8:de25 with SMTP id ffacd0b85a97d-39ee5b8b992mr3863318f8f.41.1744874096760; Thu, 17 Apr 2025 00:14:56 -0700 (PDT) Received: from ?IPV6:2003:cb:c706:2700:abf9:4eac:588c:adab? (p200300cbc7062700abf94eac588cadab.dip0.t-ipconnect.de. [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 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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: GSaF4QL0hZxTVYNXGhMqILRlMFpc_7RnhDfcYriO1h8_1744874097 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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