linux-kernel - [PATCH 1/8] rust: pci: add is

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Message-Id: <20251119-rust-pci-sriov-v1-1-883a94599a97@redhat.com>
Date: Wed, 19 Nov 2025 17:19:05 -0500
From: Peter Colberg <pcolberg@...hat.com>
To: Danilo Krummrich <dakr@...nel.org>, 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>, 
 Abdiel Janulgue <abdiel.janulgue@...il.com>, 
 Daniel Almeida <daniel.almeida@...labora.com>, 
 Robin Murphy <robin.murphy@....com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Dave Ertman <david.m.ertman@...el.com>, Ira Weiny <ira.weiny@...el.com>, 
 Leon Romanovsky <leon@...nel.org>
Cc: linux-pci@...r.kernel.org, rust-for-linux@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>, 
 Alistair Popple <apopple@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, John Hubbard <jhubbard@...dia.com>, 
 Zhi Wang <zhiw@...dia.com>, Peter Colberg <pcolberg@...hat.com>, 
 Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH 1/8] rust: pci: add is_virtfn(), to check for VFs

From: John Hubbard <jhubbard@...dia.com>

Add a method to check if a PCI device is a Virtual Function (VF) created
through Single Root I/O Virtualization (SR-IOV).

Signed-off-by: John Hubbard <jhubbard@...dia.com>
Reviewed-by: Alistair Popple <apopple@...dia.com>
Signed-off-by: Peter Colberg <pcolberg@...hat.com>
---
This patch was originally part of the series "rust: pci: expose
is_virtfn() and reject VFs in nova-core" and modified as follows:
- Replace true -> `true` in doc comment.
- Shorten description and omit justification specific to nova-core.

Link: https://lore.kernel.org/rust-for-linux/20250930220759.288528-2-jhubbard@nvidia.com/
---
 rust/kernel/pci.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index 82e128431f080fde78a06dc5c284ab12739e747e..c20b8daeb7aadbef9f6ecfc48c972436efac9a08 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -409,6 +409,12 @@ pub fn resource_start(&self, bar: u32) -> Result<bindings::resource_size_t> {
         Ok(unsafe { bindings::pci_resource_start(self.as_raw(), bar.try_into()?) })
     }
 
+    /// Returns `true` if this device is a Virtual Function (VF).
+    pub fn is_virtfn(&self) -> bool {
+        // SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`.
+        unsafe { (*self.as_raw()).is_virtfn() != 0 }
+    }
+
     /// Returns the size of the given PCI BAR resource.
     pub fn resource_len(&self, bar: u32) -> Result<bindings::resource_size_t> {
         if !Bar::index_is_valid(bar) {

-- 
2.51.1