linux-kernel - Re: [PATCH v2 03/10] PCI/LUO: Forward prepare()/freeze()/cancel() callbacks to driver

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Message-ID: <20251003120358.GL3195829@ziepe.ca>
Date: Fri, 3 Oct 2025 09:03:58 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: David Matlack <dmatlack@...gle.com>
Cc: Chris Li <chrisl@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, Len Brown <lenb@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Pasha Tatashin <tatashin@...gle.com>,
	Jason Miu <jasonmiu@...gle.com>, Vipin Sharma <vipinsh@...gle.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Adithya Jayachandran <ajayachandra@...dia.com>,
	Parav Pandit <parav@...dia.com>, William Tu <witu@...dia.com>,
	Mike Rapoport <rppt@...nel.org>, Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH v2 03/10] PCI/LUO: Forward prepare()/freeze()/cancel()
 callbacks to driver

On Thu, Oct 02, 2025 at 04:42:17PM -0700, David Matlack wrote:
> On Thu, Oct 2, 2025 at 4:21 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
> > On Thu, Oct 02, 2025 at 02:31:08PM -0700, David Matlack wrote:
> > > And we don't care about PF drivers until we get to
> > > supporting SR-IOV. So the driver callbacks all seem unnecessary at
> > > this point.
> >
> > I guess we will see, but I'm hoping we can get quite far using
> > vfio-pci as the SRIOV PF driver and don't need to try to get a big PF
> > in-kernel driver entangled in this.
> 
> So far we have had to support vfio-pci, pci-pf-stub, and idpf as PF
> drivers, and nvme looks like it's coming soon :(

How much effort did you put into moving them to vfio though? Hack Hack
in the kernel is easy, but upstreaming may be very hard :\

Shutting down enough of the PF kernel driver to safely kexec is almost
the same as unbinding it completely.

Jason