bhyve: passthrough of PCIe device without MSI possible?

[Felix Palmen]

I have the following PCIe card on a host running 11.1-RELEASE:

| ppt0 at pci0:5:0:0:	class=0x078000 card=0x00011b74 chip=0x08101b74 
rev=0x14 hdr=0x00
|     vendor     = 'OpenVox Communication Co. Ltd.'
|     class      = simple comms

it doesn't support MSI according to `pciconf -lbc`:

| ppt0 at pci0:5:0:0:    class=0x078000 card=0x00011b74 chip=0x08101b74 
rev=0x14 hdr=0x00
|     bar   [10] = type Memory, range 32, base 0xdfe00000, size 524288, 
enabled

Trying to pass this card to a guest using `vm-bhyve` gives me the 
following in `bhyve.log`:

| bhyve: failed to initialize MSI for PCI 5/0/0

and this in `vm-byve.log`:

| [bhyve options: -c 2 -m 2G -Hwl 
bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd -U 
9f2546f5-5464-11e8-8b52-d05099c0f275 -S]
| [bhyve devices: -s 0,hostbridge -s 31,lpc -s 
4:0,virtio-blk,/dev/zvol/zroot/vm/pbx/disk0 -s 
5:0,virtio-net,tap2,mac=58:9c:fc:00:d7:6b -s 6:0,passthru,5/0/0 -s 
7:0,fbuf,tcp=0.0.0.0:5900]
| [bhyve console: -l com1,/dev/nmdm0A]
| [bhyve iso device: -s 3:0,ahci-cd,/var/vm/.config/null.iso]
| starting bhyve (run 1)
| bhyve exited with status 1

Now .. is it actually possible to pass such a device to a bhyve guest? 
 From the code comment here:
<https://github.com/freebsd/freebsd/blob/master/usr.sbin/bhyve/pci_passthru.c#L257>
I assumed MSI would be "emulated" if necessary?

TIA, Felix

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