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Tue, 28 Apr 2026 10:50:37 -0700 (PDT) Date: Tue, 28 Apr 2026 17:50:35 +0000 From: Pasha Tatashin To: David Matlack Cc: Pasha Tatashin , Pratyush Yadav , iommu@lists.linux.dev, kexec@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Adithya Jayachandran , Alexander Graf , Alex Williamson , Bjorn Helgaas , Chris Li , David Rientjes , Jacob Pan , Jason Gunthorpe , Joerg Roedel , Jonathan Corbet , Josh Hilke , Leon Romanovsky , Lukas Wunner , Mike Rapoport , Parav Pandit , Pranjal Shrivastava , Robin Murphy , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Will Deacon , William Tu , Yi Liu Subject: Re: [PATCH v4 01/11] PCI: liveupdate: Set up FLB handler for the PCI core Message-ID: References: <20260423212316.3431746-1-dmatlack@google.com> <20260423212316.3431746-2-dmatlack@google.com> <2vxzeck45yin.fsf@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On 04-27 23:59, David Matlack wrote: > On 2026-04-24 01:29 PM, Pasha Tatashin wrote: > > On 04-24 14:33, Pratyush Yadav wrote: > > > Hi David, > > > > > > On Thu, Apr 23 2026, David Matlack wrote: > > > [...] > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > > > index c9b7b6f9828e..94af31837375 100644 > > > > --- a/MAINTAINERS > > > > +++ b/MAINTAINERS > > > > @@ -20555,6 +20555,18 @@ L: linux-pci@vger.kernel.org > > > > S: Supported > > > > F: Documentation/PCI/pci-error-recovery.rst > > > > > > > > +PCI LIVE UPDATE > > > > +M: Bjorn Helgaas > > > > +M: David Matlack > > > > +L: linux-pci@vger.kernel.org > > > > +S: Supported > > > > +Q: https://patchwork.kernel.org/project/linux-pci/list/ > > > > +B: https://bugzilla.kernel.org > > > > +C: irc://irc.oftc.net/linux-pci > > > > +T: git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git > > > > +F: drivers/pci/liveupdate.c > > > > +F: include/linux/kho/abi/pci.h > > > > + > > > > > > Can we please also add these files under the "LIVE UPDATE" entry. The > > > code here concerns both live update and PCI. > > Covering that intersection of Live Update and PCI was exactly my > intention with introducing this new PCI LIVE UPDATE entry. This ensures > we have maintenance coverage with knowledge of that intersection. > > > > We can figure out the > > > maintenance details as we go along, but I think the live update > > > maintainers should at least get all the patches for PCI live update. > > Would adding kexec@ here be sufficient or do you want to be CC'd > directly? > > If you want to be CC'd directly do you think makes more sense to add the > Live Update maintainers as Reviewers under PCI LIVE UPDATE, or add > drivers/pci/liveupdate.c under LIVE UPDATE? > > > > > > > Perhaps also add the kexec list here? We plan to use it to maintain the > > > LUO patches, and adding it will make sure we get the patches in case > > > someone updates the file list here but forgets to update it in the LIVE > > > UPDATE entry. > > > > +1 > > > > These files should also be added to the Live Update entry, and the kexec > > mailing list should be included. > > > > Changes specific to Live Update should be routed through the > > liveupdate/linux.git tree, while generic PCI changes should go through > > pci/pci.git. In either case, if liveupdate.c or abi/pci.h are modified, > > acks are required from the Live Update group. > > Do you want to merge changes to drivers/pci/liveupdate.c through the > live update tree or PCI tree? We should probably decide now. I was > assuming the PCI tree since its part of PCI core. > > As we project this out there are going to be users of the Live Update > API across different parts of the kernel: PCI core, IOMMU core, IOMMU > drivers, VFIO core, VFIO PCI drivers, and KVM. I don't think it will > scale to take all that code through the live update tree. All Live-Update-specific changes should go through the liveupdate tree. The liveupdate tree is the only Linux tree that will cover full Live Update regression testing, and it contains reviewers and maintainers who know the details of the Live Update process, its lifecycle, and its requirements. The request we are hearing from other subsystem maintainers is that they want to make sure Live Update is isolated enough not to make their lives harder. This means reducing the number of conflicts, the maintenance burden, and testing responsibilities. Therefore, the "PCI LIVE UPDATE" entry should specify you as a maintainer, "kexec@lists.infradead.org" as the list to which all LU changes should be CC'd, and "liveupdate/linux.git" as the git tree against which changes should be applied. It should also include "linux-pci@vger.kernel.org" so the PCI maintainers are CC'd. In case there are larger changes that touch core PCI and liveupdate.c/abi, we can ACK them, ensuring we are aware of incoming conflicts during the current or next merge cycle. It should also specify the members of LU group so we can stage the changes. This is the way we agreed to handle kexec changes: Baoquan He is the maintainer, and without his Reviewed-by tag, we won't take changes to kexec. This is the approach we follow with MM for KHO changes to memblock and memfd preservation, as well as the upcoming hugetlb/guestmemfd preservation. This is also the approach we should continue using when adding LUO support to other components like PCI, VFIO, IOMMU, and KVM. It keeps life easier for the core component maintainers and ensures we do not regress LU by staging everything in the same tree and sending LU merge requests from a single tree. Pasha