Re: [PATCH v5 9/9] samples: rust: add Rust SR-IOV PF and VF driver samples

[sashiko-bot@kernel.org]

> From: Peter Colberg <peter@colberg.org>
> 
> Add separate PF and VF driver modules that demonstrate SR-IOV using
> QEMU's 82576 (igb) emulation.
> 
> The PF publishes a pinned API object in its private data and exposes a
> submit_request() helper. The VF calls this helper with its Bound device
> borrow. The helper performs the typed registration lookup in the PF
> crate, keeping the API object and its lifetime encoding private.
> 
> Adapt the nova-core/nova-drm rules in drivers/gpu/Makefile, preserving
> their metadata, export-selection and MODVERSIONS recipes with the sample
> object names and paths. Set the PF crate name explicitly because its Rust
> root file has a _main suffix.
> 
> Keep the helper out of line so the VF module has a real symbol dependency
> on the PF module. The module loader therefore holds the PF module while
> the VF module is loaded, and modprobe loads the dependency automatically.
> 
> Each driver has its own module registration. The VF module can be unloaded
> and reloaded while the PF remains bound. Unbinding the PF disables SR-IOV
> and removes its VFs before releasing the registered data. The shared
> Kconfig option builds both drivers as modules or both into the kernel.
> 
> Link: https://www.qemu.org/docs/master/system/devices/igb.html
> Signed-off-by: Peter Colberg <peter@colberg.org>
> Co-developed-by: Zhi Wang <zhiw@nvidia.com>
> Signed-off-by: Zhi Wang <zhiw@nvidia.com>
> Signed-off-by: Simon Song <xinmengs@nvidia.com>

Sashiko has reviewed this patch and found no issues.

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