Re: [PATCH v4 01/11] PCI: liveupdate: Set up FLB handler for the PCI core

[David Matlack <dmatlack@google.com>]

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 <bhelgaas@google.com>
> > > +M:	David Matlack <dmatlack@google.com>
> > > +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.