USB 3.0 PCI Controller Pass through

• 1. Determine the bus/slot/function of the device that you want to pass through with pciconf -vl. My device is:

xhci1@pci0:8:0:0:	class=0x0c0330 card=0x34831106 chip=0x34831106 rev=0x01 hdr=0x00
        vendor     = 'VIA Technologies, Inc.'
        class      = serial bus
        subclass   = USB

• 2. Disable the xhci driver in the FreeBSD kernel.

# Compile a custom kernel without xhci driver

# cd /usr/src/sys/amd64/conf
# cp GENERIC MYKERNEL
# ee MYKERNEL

# Find and change lines as below:
# Note the commented out portion disabling the device in the kernel.

ident MYKERNEL
#device		xhci			# XHCI PCI->USB interface (USB 3.0)

# Save and exit

# cd /usr/src
# make buildkernel KERNCONF=MYKERNEL
# make installkernel KERNCONF=MYKERNEL
# reboot

# After reboot 'pciconf -vl' must return:

none0@pci0:8:0:0:	class=0x0c0330 card=0x34831106 chip=0x34831106 rev=0x01 hdr=0x00
        vendor     = 'VIA Technologies, Inc.'
        class      = serial bus
        subclass   = USB

• 3. The device is ready for the pass through

# ee /boot/loader.conf

# add this line:

pptdevs="8/0/0"

# save, exit, reboot 
# and again:

# pciconf -vl

# Now the output is like:

ppt0@pci0:8:0:0:	class=0x0c0330 card=0x34831106 chip=0x34831106 rev=0x01 hdr=0x00
        vendor     = 'VIA Technologies, Inc.'
        class      = serial bus
        subclass   = USB

• 4. Pass the device with iohyve:

# iohyve set bsd(linux)guest pcidev:1=passthru,8/0/0

That's all!

By: @Eresia999