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[34.145.255.212]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-6664083f9f6sm1511013d50.16.2026.07.03.17.52.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Jul 2026 17:52:06 -0700 (PDT) Date: Fri, 3 Jul 2026 20:52:05 -0400 From: Pasha Tatashin To: Pasha Tatashin , Alexander Graf , "Andersen, Tycho" , Anthony Yznaga , Baolu Lu , David Hildenbrand , David Matlack , "Heyne, Maximillian" , James Gowans , Jason Gunthorpe , Mike Rapoport , Pankaj Gupta , Pratyush Yadav , Praveen Kumar , Vipin Sharma , Vishal Annapurve , "Woodhouse, David" , Luca Boccassi , Samiullah Khawaja , Jork Loeser , Chenghao Duan , Zhu Yanjun Cc: linux-mm@kvack.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [Hypervisor Live Update] Notes from June 15 and June 29, 2026 Message-ID: References: <20260704004316.1109918-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260704004316.1109918-1-pasha.tatashin@soleen.com> X-Stat-Signature: o3jme5xn5mk6qikeqq6p5cskoyamx65c X-Rspamd-Queue-Id: 54F8520009 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1783126328-336300 X-HE-Meta: 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 pGXp3Vrh 7mHdW8gFDMQRzYXWE9LxwPuhfqSQ9L6Tdjxr+AZ3MBj4+yAIHS9wIflzbi+uX/kQk4gUpOASWG9Fw4S5e1PDJjJiDfKB0A3ZtSdoEl1EmIFDzkHR/VoxCeGx+/KK42ceu8YePBO4d+hqKZH5Fm3SuIokVPv0GUTayG+LWOPpCqfDzXiNvOqdWcLPX/DgnLQFOaLP3alvYNNwPPjxzk0VnSnN9WnGd+qLCWqGdQy42ssVD/Z7gqBM8Y7mIUfbss34EdPqWdNFcXSdmIl+nu2+LjmYPJc2IyRPl9E9dRuyH2xwLOAc4Q5YDRt46bwFNyFv7oqNf/V/5QTzTZ5NMr6Kz79ZU3LjDIVIeX8H8XLcg69JBOnQLtBKM3/CG69EkVqAPRz3CSM4QBPrpAiqGgAnpSGKlyxihbeJfGmU5WJbYDlKBq5kBxxMegZ2kpQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Adding missing CCs to the mailing lists. On 07-03 20:43, Pasha Tatashin wrote: > Hi everybody, > > Here are the combined notes from our last two Hypervisor Live Update > calls, held on June 15 and June 29. These notes are intended to bring > those who could not attend up to speed and to keep the momentum going > between meetings. > > ----->o----- > LPC 2026 Call for Proposals > > The Call for Proposals for the Live Update Microconference at LPC 2026 > in Prague is open. Please make sure to submit your topics and abstracts > before the upcoming deadline on July 24th. > > https://lore.kernel.org/all/ahcc3Qyuy7Oy03Iq@plex > > ----->o----- > VFIO & PCIe Persistence Roadmap > > * Roadmap Recap (June 15): Vipin Sharma outlined the five-milestone > roadmap for preserving PCIe endpoint functions (and upstream bridges) > across live updates without disrupting registers or ongoing DMA. > > * Status Update (June 29): Vipin has addressed feedback on the v4 > submission. Revision v5 is currently undergoing internal validation > and is on track for the mailing list before our next sync. > > PCIe Core Updates > > * v6/v7 Evolution: David Matlack is preparing the v7 PCI series. The > group aligned on deploying an FLB reference-counting model to maintain > symmetry for incoming/outgoing sessions across kexec. > > * Pratyush Yadav suggested that drivers should explicitly isolate > structural "probe" routines from "retrieve" logic and separate > "shutdown" from "finish" callbacks. David is evaluating the > feasibility of deferring probes until the retrieve phase to improve > driver cleanliness. > > * David is refactoring the PCI series to utilize KHO blocks. > > IOMMU & Dependency Management > > * v3 Status: Samiullah has posted v3 of the IOMMU persistence series, > addressing hot-plug handling and context entry preservation. > > * Dependency Policy: The group agreed that the Live Update framework > will not enforce a hardcoded preservation sequence. Instead, > individual subsystem file handlers will verify dependency states > locally during their freeze/finish callbacks. > > LUO, KHO > > * Terminology Updates: "Scratch" memory is now designated as > "unpreserved memory" (memblock perspective). KHO "Scratch" is renamed > to "KHO boot memory". > > * LUO Limits: Limits on the number of sessions and preserved files have > been removed and landed in upstream Linux. > > Guest Memory (guest_memfd) > > * Naming Conventions: Regarding the KVM file binding debate, the team is > moving away from the debugfs-based incremented value approach (due to > production compilation concerns). We are exploring using unique names > derived from user-space file-handler compatibility strings. Tarun will > escalate this to the KVM maintainers. > > ----->o----- > Action Items & Next Steps > > Pasha: Consult with Mike regarding KHO component splitting without > versioning support. > > David M: Send next version of the FLB ref-count patch; refactor PCI > series to use KHO blocks; share recording link from June 29. > > Pratyush: Implement rename of KHO scratch/boot mem. > > Vipin: Submit VFIO v5. > > Group: Review Guest Memory Preservation V3 series (Pasha/David). > > ----->o----- > > Next meeting will be on Monday, July 13 at 8am PDT (UTC-7), everybody is > welcome! > > Join Here: https://meet.google.com/rjn-dmzu-hgq > > Please let me know if you'd like to propose additional topics for > discussion, thank you! > > Best regards, > Pasha