linux-kernel - Re: [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in nova-core

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Message-ID: <20251002143116.GA3268803@nvidia.com>
Date: Thu, 2 Oct 2025 11:31:16 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Zhi Wang <zhiw@...dia.com>
Cc: John Hubbard <jhubbard@...dia.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>, Alistair Popple <apopple@...dia.com>,
	Surath Mitra <smitra@...dia.com>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	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" <nouveau@...ts.freedesktop.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in
 nova-core

On Thu, Oct 02, 2025 at 02:29:09PM +0000, Zhi Wang wrote:
> On 2.10.2025 16.42, Jason Gunthorpe wrote:
> > On Thu, Oct 02, 2025 at 12:59:59PM +0000, Zhi Wang wrote:
> >> On 2.10.2025 14.58, Jason Gunthorpe wrote:
> >>> On Wed, Oct 01, 2025 at 09:13:33PM +0000, Zhi Wang wrote:
> >>>
> >>>> Right, I also mentioned the same use cases of NIC/GPU in another reply
> >>>> to Danilo. But what I get is NVIDIA doesn't use bare metal VF to support
> >>>> linux container, 
> >>>
> >>> I don't think it matter what "NVIDIA" does - this is the upstream
> >>> architecture it should be followed unless there is some significant
> >>> reason.
> >>
> >> Hmm. Can you elaborate why?
> >>
> >> From the device vendor's stance, they know what is the best approach
> >> to offer the better the user experience according to their device
> >> characteristic.
> > 
> > You can easially push the code to nova core not vfio and make it work
> > generically, some significant reason is needed beyond "the vendor
> > doesn't want to".

You'd have to be more specific, I didn't see really any mediation
stuff in the vfio driver to explain why the VF in the VM would act so
differently that it "couldn't work"

Even if there is some small FW issue, it is better to still structure
things in the normal way and assume it will get fixed sometime later
than to forever close that door.

Jason