How to install OpenBSD on SmartOS with bhyve hypervisor (OpenBSD65 and SmartOS 20190424)

OpenBSD_on_SmartOS_with_BHYVE

How to install OpenBSD with bhyve-vm on SmartOS (20190424):

tl;dr:
  Create a bhyve vm with an empty disk, where you put an install image with dd afterwards.
  "bhyve_extra_opts": "-w"
  "bootrom": "uefi"
  "vcpus": 1 (is needed too, some say..)
  Change to serial console when booting the install image

Do it like this:

I've my json manifests stored in /opt/manifests, so I can reuse them.

Create a manifest like below with values matching your environment and resources.

# cat openbsd65.json
{
    "alias": "OpenBSD",
    "autoboot": false,
    "brand": "bhyve",
    "hostname": "obsd",
    "resolvers": [
        "8.8.8.8",
        "8.8.4.4"
    ],
    "ram": 1024,
    "vcpus": 1,
    "nics": [
        {
            "interface": "net0",
            "model": "virtio",
            "nic_tag": "admin",
            "ip": "172.34.56.78",
            "gateway": "172.34.56.1",
            "netmask": "255.255.255.0",
            "primary": true

        }
    ],
    "disks": [
        {
            "boot": true,
            "model": "virtio",
            "size": 16384,
            "compression": "on"
        }
    ],
    "bootrom": "uefi",
    "bhyve_extra_opts": "-w"
}

#--------------

# Create the bhyve machine (with at least one empty disk): 

vmadm create < openbsd65.json

#--------------

# Get the uuid for this new bhyve machine:

uuid=`vmadm list -p -o uuid alias=OpenBSD`

#--------------

# If not autoboot=false, stop the vm:

vmadm stop $uuid -F

#--------------

# Download an install image:

cd /var/tmp
wget http://cdn.openbsd.org/pub/OpenBSD/6.5/amd64/install65.fs

# ------------

# Prepare the disk with the install image:

dd if=install65.fs of=/dev/zvol/rdsk/zones/$uuid/disk0 bs=1M

# ------------

# Open one more SSH-session and start a console to this machine from within
# This is possible even if the vm is not running.
# We need this to fix serial console (soon)

zlogin -C `vmadm list -p -o uuid alias=OpenBSD`

# ------------

# Get back to original session with the console session visible,
# and boot up the vm

vmadm start $uuid

# ------------

# In the "console", when boot prompt shows up, enable serial console and boot:

set tty com0
boot

# ------------

# Install it (on the same disk as you booted from).
# Everything is "normal" from here

# That's all folks!