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bhyve would have to support what is called "PCI-E passthrough", and support such functionality via IOMMUs to allow device-initiated DMAs to work (which GPUs, >=10gbit NICs, storage controllers, etc, all require).

KVM, Xen, and ESXI all support this, so if bhyve doesn't support it yet, it most likely will in the future.

It should work for Intel's VT-d, but you're out of luck if you use AMD.

What? AMD has support for IOMMU.

The implementation is different to Intel's. AFAIK, bhyve has code to support one but not the other.

It seems the answer should be 'yes':

https://github.com/pr1ntf/iohyve/wiki/USB-3.0-PCI-Controller...

I don't have an answer to your question but note that bhyve is still very new, it is still very experimental, and the feature list is still pretty short. That said, work is ongoing and progressing pretty quickly.

You won't have much help from Nvidia, they like to disable this sort of thing when they can, artificial limits in their binary drivers etc.