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

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Message-ID: <20251003120638.GM3195829@ziepe.ca>
Date: Fri, 3 Oct 2025 09:06:38 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Chris Li <chrisl@...nel.org>
Cc: David Matlack <dmatlack@...gle.com>,
	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 10:24:59PM -0700, Chris Li wrote:

> As David pointed out in the other email, the PCI also supports other
> non vfio PCI devices which do not have the FD and FD related sessions.
> That is the original intent for the LUO PCI subsystem.

This doesn't make sense. We don't know how to solve this problem yet,
but I'm pretty confident we will need to inject a FD and session into
these drivers too.

> away once we have the vfio-pci as the real user. Actually getting the
> pci-pf-stub driver working would be a smaller and reasonable step to
> justify the PF support in LUO PCI.

In this contex pci-pf-stub is useless, just use vfio-pci as the SRIOV
stub. I wouldn't invest in it. Especially since it creates more
complexity because we don't have an obvious way to get the session FD.

Jason