Post-Kangrejos, the approach for NovaCore + VFIO has changed a bit: the idea now is that VFIO drivers, for NVIDIA GPUs that are supported by NovaCore, should bind directly to the GPU's VFs. (An earlier idea was to let NovaCore bind to the VFs, and then have NovaCore call into the upper (VFIO) module via Aux Bus, but this turns out to be awkward and is no longer in favor.) So, in order to support that:
Nova-core must only bind to Physical Functions (PFs) and regular PCI devices, not to Virtual Functions (VFs) created through SR-IOV. Add a method to check if a PCI device is a Virtual Function (VF). This allows Rust drivers to determine whether a device is a VF created through SR-IOV. This is required in order to implement VFIO, because drivers such as NovaCore must only bind to Physical Functions (PFs) or regular PCI devices. The VFs must be left unclaimed, so that a VFIO kernel module can claim them. Use is_virtfn() in NovaCore, in preparation for it to be used in a VFIO scenario. I've based this on top of today's driver-core-next [1], because the first patch belongs there, and the second patch applies cleanly to either driver-core-next or drm-rust-next. So this seems like the easiest to work with. [1] https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git/ John Hubbard (2): rust: pci: add is_virtfn(), to check for VFs gpu: nova-core: reject binding to SR-IOV Virtual Functions drivers/gpu/nova-core/driver.rs | 5 +++++ rust/kernel/pci.rs | 6 ++++++ 2 files changed, 11 insertions(+) base-commit: 6d97171ac6585de698df019b0bfea3f123fd8385 -- 2.51.0
