Here are some tips and steps to get it working:
- Only PCI devices that support MSI (message signaled interrupts) will work. You can figure all of this out with the command:
In my case, I get:
xhci1@pci0:3:0:0: class=0x0c0330 card=0x12421b21 chip=0x12421b21 rev=0x00 hdr=0x00
vendor = 'ASMedia Technology Inc.'
device = 'ASM1142 USB 3.1 Host Controller'
class = serial bus
subclass = USB
cap 05 = MSI supports 8 messages, 64 bit
cap 11 = MSI-X supports 8 messages
Table in map 0x10[0x2000], PBA in map 0x10[0x2080]
cap 01 = powerspec 3 supports D0 D3 current D0
cap 10 = PCI-Express 2 endpoint max data 128(512) NS
link x2(x2) speed 5.0(5.0) ASPM disabled(L0s/L1)
ecap 0002 = VC 1 max VC0
ecap 0001 = AER 1 0 fatal 0 non-fatal 0 corrected
ecap 0019 = PCIe Sec 1 lane errors 0
ecap 0018 = LTR 1
- bhyve expects that PCI devices that will be passed through must be associated with the ppt driver. Rebooting your machine is not required. In the above example, the device is associated with the xhci driver. To associate it with the ppt driver:
devctl detach pci3:0:0
devctl set driver pci3:0:0 ppt
If you execute pciconf -lvc again, you'll now notice:
ppt1@pci0:3:0:0: class=0x0c0330 card=0x12421b21 chip=0x12421b21 rev=0x00 hdr=0x00
- In modern bhyve, you must supply the -S argument to bhyve in order to get PCI passthrough working:
iohyve set vm_name_here bargs = "-H -w -S"
- Create the mapping for the PCI device in question:
iohyve set vm_name_here pcidev:1=passthru,3/0/0
- Limit or completely disable network access to your virtual server!