AMD Ryzen Byhyve "sysctl: unknown oid "hw.vmm.amdvi""

[pestalent1]

Hello,
I have bhyve up and running on my "FreeBSD 11.2/bhyve 1.1.8_2  running 
kde5 desktop with: "ryzen 7 1700 (overclocked to 3700Mhz, if that 
matters) 32 GB of ram on a MSI x370 Gaming Plus motherboard with the 
latest bios". I have a windows 2012r2 vm (config below) up and running, 
it has 4 of my physical hard-drives passed through, all is working. I am 
trying to passthrough the below USB 3 controller. Not sure if it 
matters, the IOMMU was set to "auto" in the bios/uefi when I installed 
the OS. It is now set to "enable"

It does not work the Vm fails to boot. Do I have something 
mis-configured or I am missing something. I hope I have provided all the 
necessary info for assistance.

|ppt0 at pci0:40:0:0: class=0x0c0330 card=0x7a331462 chip=0x21421b21 
rev=0x00 hdr=0x00 vendor = 'ASMedia Technology Inc.' class = serial bus 
subclass = USB cap 05[50] = MSI supports 8 messages, 64 bit cap 01[78] = 
powerspec 3 supports D0 D3 current D0 cap 10[80] = PCI-Express 2 legacy 
endpoint max data 128(512) RO NS link x2(x2) speed 8.0(8.0) ASPM 
disabled(L0s/L1) ecap 0001[100] = AER 1 0 fatal 0 non-fatal 0 corrected 
ecap 0019[200] = PCIe Sec 1 lane errors 0 ecap 0018[300] = LTR 1 |

  My loader.conf

|kern.vty=vt zfs_load="YES" fuse_load="YES" 
kern.geom.label.disk_ident.enable="0" kern.geom.label.gptid.enable="0" 
vmm_load="YES" nmdm_load="YES" if_bridge_load="YES" if_tap_load="YES" 
hw.syscons.disable="1" hw.vmm.amdvi.enable="1" 
hw.vmm.topology.cores_per_package=4 #hw.vmm.topology.threads_per_core=2 
pptdevs="40/0/0"|



My VM config file:

|uefi="yes" cpu=4 memory=6G graphics="yes" xhci_mouse="yes" 
graphics_res="1600x900" network0_type="virtio-net" 
network0_switch="public" #ahci_device_limit="6" debug="yes" 
disk0_opts="sectorsize=512" disk0_type="ahci-hd" 
disk0_name="BackupR7.img" disk1_dev="custom" disk1_opts="sectorsize=512" 
disk1_type="ahci-hd" disk1_name="/dev/ada0,hd:/dev/ada1" 
disk2_dev="custom" disk2_opts="sectorsize=512" disk2_type="ahci-hd" 
disk2_name="/dev/ada2,hd:/dev/ada3" 
uuid="762f78e9-270b-11e8-87a4-309c230c9abc" 
network0_mac="02:15:5d:45:32:01" passthru0="40/0/0"|


|acpidump -t | grep DMAR|shows nothing, I have IOMMU enabled in bios or 
uefi.

sysctl hw.vmm.amdvi  gives me "sysctl: unknown oid "hw.vmm.amdvi""

last line in my vm-bhyve.log : fatal;  pci passthrough not supported on 
this system (no VT-d)

  dmesg | egrep -i 'ivrs|ivh|amd-vi|mmu'
pci0: <base peripheral, IOMMU> at device 0.2 (no driver attached)
pci0: <base peripheral, IOMMU> at device 0.2 (no driver attached)
pci0: <base peripheral, IOMMU> at device 0.2 (no driver attached)
amd_iommu_init: not implemented

I would appreciate any and all help
Thanks,
Pete K