vDPA bus driver selection

Hi folks,
I was trying to understand if we have a way to specify which vDPA bus
driver (e.g. vhost-vdpa, virtio-vdpa) a device should use.
IIUC we don't have it, and the first registered driver is used when a
new device is registered.

I was thinking if it makes sense to extend the management API to
specify which bus driver to use for a device. A use case could be for
example a single host handling VMs and bare-metal containers, so we
would have both virtio-vdpa and vhost-vdpa loaded and we want to
attach some devices to VMs through vhost-vdpa and others to containers
through virtio-vdpa.

What do you think?

I can prepare an RFC with some code, the idea is to use the .match
callback of "struct bus_type" to use a driver instead of the other,
and extend netlink API to specify the vDPA bus driver name to use.

Thanks,
Stefano

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