[Call For Test] Single USB device passthrough for Bhyve

Hello all:


I am currently working on implementing single USB device passthrough for
bhyve.

The patch is over here: https://reviews.freebsd.org/D52166

At this stage, all four types of transfers are supported: control, bulk, interrupt,
and isochronous. I have verified functionality with a few devices, but broader
testing is definitely needed to ensure stability and
compatibility. The isochornous xfer remain untested since it is
a little bit hard for me to setup uvc test in guest.

In addition, device hotplug is supported. This means that once the guest is
running, you can physically remove a device and reattach it without
requiring a restart.

To build this feature, please apply all parent patches listed on
Phabricator and rebuild kernel, libusb, and usbconfig.

To test passthrough, append the following argument in your bhyve
config, -s 30,xhci,passthru.vid.pid
Here, vid and pid are the hexadecimal value of the vendor id
and product id of the target device. You can obtain these values with:
usbconfig dump_all_desc.

I would greatly appreciate it if more people could test this feature and
provide feedback. Thanks!

-- 
Best Regards.
ShengYi Hung.