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Thu, 17 Apr 2025 02:46:45 +0000 Message-ID: Date: Thu, 17 Apr 2025 10:46:39 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [Invitation] bi-weekly guest_memfd upstream call on 2025-04-17 To: David Hildenbrand , "linux-coco@lists.linux.dev" , "linux-mm@kvack.org" , KVM References: <971a3797-5fc4-4c7f-a856-dca05f9a874e@redhat.com> Content-Language: en-US From: Chenyi Qiang In-Reply-To: <971a3797-5fc4-4c7f-a856-dca05f9a874e@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KL1PR0401CA0016.apcprd04.prod.outlook.com (2603:1096:820:f::21) To DM3PR11MB8735.namprd11.prod.outlook.com (2603:10b6:0:4b::20) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM3PR11MB8735:EE_|LV2PR11MB6045:EE_ X-MS-Office365-Filtering-Correlation-Id: 0e856319-cddd-4a24-6135-08dd7d5a179c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; 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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, 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. Thanks Chenyi