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

[Alexandre Courbot]

On Wed Oct 1, 2025 at 7:07 AM JST, John Hubbard wrote:
> 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.

Naive question: will guests also see the passed-through VF as a VF? If
so, wouldn't this change also prevents guests from using Nova?