Add usb port passthrough (hostbus+hostport) #620
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This PR adds USB Port Passthrough as an alternative to the existing USB Device Passthrough. Instead of tracking devices by vendorId:productId, it tracks them by bus + port combination. This utilizes most of the already working code used in USB device passthrough.
The existing USB passthrough works great for most cases, but fails when a device's ID changes mid-session. A common example is firmware updates - when you update a controller's firmware, it often re-enumerates with a different VID:PID (e.g., entering DFU/bootloader mode), causing it to disconnect from the VM.
I tested my Cyclone 2 firmware update using this passthrough in Xbox wired mode. It changes IDs during the process, so device passthrough was not an option.
This uses hostbus + hostport combination to passthrough devices. When a device connects to a registered port, it automatically gets passed through to the VM regardless of its VID:PID.
Note:
Port passthrough doesn't work when you attach a USB 3.x device after the port was registered with a USB 2.0 device (or vice-versa). This is because USB 3.0 ports have separate controllers for USB 2.0 and USB 3.0 protocols, resulting in different bus numbers for the same physical port.