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

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Message-ID: <CA+CK2bBLuGAMwVgj87p_H12P9yy6J99WwX8vwZbFfY0RTYsXDA@mail.gmail.com>
Date: Fri, 3 Oct 2025 12:28:00 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: David Matlack <dmatlack@...gle.com>, 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>, 
	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>, Brian Vazquez <brianvv@...gle.com>
Subject: Re: [PATCH v2 03/10] PCI/LUO: Forward prepare()/freeze()/cancel()
 callbacks to driver

On Fri, Oct 3, 2025 at 12:16 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Fri, Oct 03, 2025 at 09:03:36AM -0700, David Matlack wrote:
> > > Shutting down enough of the PF kernel driver to safely kexec is almost
> > > the same as unbinding it completely.
> >
> > I think it's totally fair to tell us to replace pci-pf-stub with
> > vfio-pci. That gets rid of one PF driver.
> >
> > idpf cannot be easily replaced with vfio-pci, since the PF is also
> > used for host networking.
>
> Run host networking on a VF instead?

There is a plan for this, but not immediately. In upstream, I suspect
vfio-pci is all we need, and other drivers can be added when it really
necessary.

>
> > Brian Vazquez from Google will be giving a
> > talk about the idpf support at LPC so we can revisit this topic there.
> > We took the approach of only preserving the SR-IOV configuration in
> > the PF, everything else gets reset (so no DMA mapping preservation, no
> > driver state preservation, etc.).
>
> Yes, that's pretty much what you'd have to do, it sure would be nice
> to have some helper to manage this to minimize driver work. It really
> is remove the existing driver and just leave it idle unless luo fails
> then rebind it..
>
> > We haven't looked into nvme yet so we'll have to revisit that discussion later.
>
> Put any host storage on a NVMe VF?
>
> Jason