linux-kernel - Re: [PATCH v2 1/2] rust: pci: skip probing VFs if driver doesn't support VFs

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Message-ID: <20251002183217.GE3299207@nvidia.com>
Date: Thu, 2 Oct 2025 15:32:17 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Danilo Krummrich <dakr@...nel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>, Alistair Popple <apopple@...dia.com>,
	Zhi Wang <zhiw@...dia.com>, Surath Mitra <smitra@...dia.com>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Alex Williamson <alex.williamson@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	nouveau@...ts.freedesktop.org, linux-pci@...r.kernel.org,
	rust-for-linux@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] rust: pci: skip probing VFs if driver doesn't
 support VFs

On Thu, Oct 02, 2025 at 11:09:40AM -0700, John Hubbard wrote:
> On 10/2/25 11:05 AM, Jason Gunthorpe wrote:
> > On Thu, Oct 02, 2025 at 10:49:21AM -0700, John Hubbard wrote:
> >>> Forgot to add: But I think Zhi explained that this is not necessary and can be
> >>> controlled by the VFIO driver, i.e. the PCI driver that binds to the VF itself.
> >>
> >> Yes, this is the direction that I originally (3 whole days ago, haha) had in mind,
> >> after talking with Zhi and a few others: nova-core handles PFs, and the VFIO driver
> >> handles the VFs, and use the "is virtual" logic to sort them out.
> > 
> > To be clear, no matter what the VFIO driver bound to the VF should not
> > become entangled with any aux devices.
> 
> I was fine until you said "aux devices". :) What does that mean in this
> context?

Something using

struct auxiliary_device

Jason