OS-7458 bhyve should allow pci_slot addressing for NICs

[jasonbking]

No description provided.

[sjorge]

I see no way to avoid collisions here?

I can add a nic without pci_slot set and mark it primary and then add a 2nd one set to 0:6:0 an they will end up in the same slot. (Or am I missing a check for that somewhere?

[sjorge]

Can we also be explicitly set the bus to 0 while we're here?

6919:   bhyve -H -U 99e40ee7-a8f9-4b57-9225-e7bd19f64b07 -B 1,manufacturer=Joyent,produ
argv[0]: bhyve
argv[1]: -H
argv[2]: -U
argv[3]: 99e40ee7-a8f9-4b57-9225-e7bd19f64b07
argv[4]: -B
argv[5]: 1,manufacturer=Joyent,product=SmartDC HVM,version=7.20200529T085640Z,serial=99e40ee7-a8f9-4b57-9225-e7bd19f64b07,sku=001,family=Virtual Machine
argv[6]: -s
argv[7]: 31,lpc
argv[8]: -l
argv[9]: bootrom,/usr/share/bhyve/uefi-rom.bin
argv[10]: -l
argv[11]: com1,/dev/zconsole
argv[12]: -l
argv[13]: com2,socket,/tmp/vm.ttyb
argv[14]: -s
argv[15]: 0,hostbridge,model=i440fx
argv[16]: -c
argv[17]: 4
argv[18]: -m
argv[19]: 4096
argv[20]: -s
argv[21]: 0:4:0,virtio-blk,/dev/zvol/rdsk/zones/99e40ee7-a8f9-4b57-9225-e7bd19f64b07/disk0
argv[22]: -s
argv[23]: 6:0,virtio-net-viona,net0
argv[24]: -s
argv[25]: 6:1,virtio-net-viona,net1
argv[26]: -s
argv[27]: 6:2,virtio-net-viona,net2
argv[28]: -s
argv[29]: 6:3,virtio-net-viona,net3
argv[30]: -s
argv[31]: 6:4,virtio-net-viona,net4
argv[32]: -w
argv[33]: -c
argv[34]: sockets=1,cores=2,threads=2
argv[35]: SYSbhyve-12

Currently the nics are the only one that get passed without the bus, sure bhyve itself wil use 0 in that case. But given we pass it for all other arguments we add, we should be consistant.