From: Jason Gunthorpe <jgg@nvidia.com>
To: John Hubbard <jhubbard@nvidia.com>
Cc: "Joel Fernandes" <joelagnelf@nvidia.com>,
"Danilo Krummrich" <dakr@kernel.org>,
"Zhi Wang" <zhiw@nvidia.com>,
"Alistair Popple" <apopple@nvidia.com>,
"Alexandre Courbot" <acourbot@nvidia.com>,
"Timur Tabi" <ttabi@nvidia.com>,
"Surath Mitra" <smitra@nvidia.com>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"nouveau@lists.freedesktop.org" <nouveau@lists.freedesktop.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"rust-for-linux@vger.kernel.org" <rust-for-linux@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Alex Williamson" <alex.williamson@redhat.com>
Subject: Re: [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in nova-core
Date: Thu, 2 Oct 2025 09:05:04 -0300 [thread overview]
Message-ID: <20251002120504.GD3195801@nvidia.com> (raw)
In-Reply-To: <7fee5949-6ff3-4da9-926d-01c1ba89e2c6@nvidia.com>
On Wed, Oct 01, 2025 at 05:54:45PM -0700, John Hubbard wrote:
> saying the reason for this is because the VFs share the same device
> IDs when in reality we have 2 different drivers that handle the
> different functions.
That's the fundamental problem here. Presenting the same device ID
when the device actually has a very different programming model is
against how PCI is supposed to operate.
For examplem mlx5 devices give unique IDs to their VFs - though they
don't have different programming models.
If novacore doesn't work on VFs at all, even in VMs, then use the
register based detection that was said earlier.
Jason
next prev parent reply other threads:[~2025-10-02 12:05 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-30 22:07 [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in nova-core John Hubbard
2025-09-30 22:07 ` [PATCH 1/2] rust: pci: add is_virtfn(), to check for VFs John Hubbard
2025-10-01 0:30 ` Alistair Popple
2025-09-30 22:07 ` [PATCH 2/2] gpu: nova-core: reject binding to SR-IOV Virtual Functions John Hubbard
2025-10-01 0:33 ` Alistair Popple
2025-10-01 1:26 ` John Hubbard
2025-10-01 0:26 ` [PATCH 0/2] rust: pci: expose is_virtfn() and reject VFs in nova-core Alexandre Courbot
2025-10-01 1:26 ` John Hubbard
2025-10-01 1:39 ` Alexandre Courbot
2025-10-01 1:45 ` John Hubbard
2025-10-01 8:09 ` Zhi Wang
2025-10-01 14:48 ` Jason Gunthorpe
2025-10-01 21:13 ` Zhi Wang
2025-10-02 1:43 ` Alexandre Courbot
2025-10-02 1:50 ` John Hubbard
2025-10-02 11:58 ` Jason Gunthorpe
2025-10-02 12:59 ` Zhi Wang
2025-10-02 13:42 ` Jason Gunthorpe
2025-10-02 14:29 ` Zhi Wang
2025-10-02 14:31 ` Jason Gunthorpe
2025-10-07 6:51 ` Zhi Wang
2025-10-07 10:14 ` Danilo Krummrich
2025-10-07 11:00 ` Zhi Wang
2025-10-07 11:26 ` Jason Gunthorpe
2025-10-01 14:46 ` Jason Gunthorpe
2025-10-01 18:16 ` Alex Williamson
2025-10-01 18:30 ` Jason Gunthorpe
2025-10-01 22:35 ` John Hubbard
2025-10-02 7:41 ` Zhi Wang
2025-10-01 0:29 ` Alistair Popple
2025-10-01 1:22 ` John Hubbard
2025-10-01 10:32 ` Danilo Krummrich
2025-10-01 13:52 ` Zhi Wang
2025-10-01 22:38 ` John Hubbard
2025-10-01 22:52 ` Danilo Krummrich
2025-10-01 23:00 ` John Hubbard
2025-10-01 23:47 ` Joel Fernandes
2025-10-01 23:51 ` John Hubbard
2025-10-01 23:55 ` Danilo Krummrich
2025-10-02 0:48 ` Joel Fernandes
2025-10-02 0:54 ` John Hubbard
2025-10-02 12:05 ` Jason Gunthorpe [this message]
2025-10-02 12:01 ` Jason Gunthorpe
2025-10-02 12:08 ` Danilo Krummrich
2025-10-02 12:32 ` Jason Gunthorpe
2025-10-02 12:41 ` Danilo Krummrich
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