5.6. FreeBSD Guests

5.6.1. FreeBSD 10.0 May Hang with xHCI

If xHCI (USB 3.0) emulation is enabled for FreeBSD 10.0 guests, the guest OS will hang. This is caused by the guest OS incorrectly handling systems where Message Signaled Interrupts (MSIs) are not used with the xHCI device.

The problem does not exist in earlier FreeBSD releases and was fixed in FreeBSD 10.1.