pi-kvm wifi systemd.network setup

enter disk write mode
rw

find wireless adapter:
commands:
use either
ip a
or
ls /sys/class/net
Pi 4 should be wlan0
create a config file which allows wpa_supplicant to use the network adapter

vi /etc/wpa_supplicant/wpa_supplicant-wlan0.conf

contents:
ctrl_interface=/run/wpa_supplicant
update_config=1
p2p_disabled=1

start wap_supplicant

wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant-wlan0.conf

once started use wpa_cli to find and configure wireless
wpa_cli
>
>scan
once scan completes run
>scan_results
Note: this is time sensitive. run scan_results right after scan completes.

configure the access point
>add_network
>set_network 0 ssid <ssid>
>set_network 0 psk <wpa_password>
> enable_network 0

Kill the wpa process so it can re-read the wpa_supplican-wlan0.conf
pkill wpa

Restart the wpa process
wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant-wlan0.conf

check wlan0 and make sure it is up. Note this just sets the carrier and not the ip address

# ip link show wlan0
should return
wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000

enable wpa_supplicant to start at system start
systemctl enable wpa_supplicant@wlan0.service

Setup wlan0 ip address.

copy /etc/systemd/network/eth0.network to /etc/systemd/network/wlan0.network
cp /etc/systemd/network/eth0.network /etc/systemd/network/wlan0.network

vi /etc/systemd/network/wlan0.network

change
[Match]
Name=eth0
to
Name=wlan0

If you are using DHCP for eth0 then you are all set. If you set a static IP on eth0 and what DHCP on wifi then change [Network] to use DHCP

[Network]
DHCP=yes
DNSSEC=no

For a static IP use

[Network]
Address=<ip_address>/<mask cidr value> (255.255.255.0 = 24 etc)
Gateway=<gateway ip address>
DNS=<dns 1>
DNS=<dns 2>
DNS=<dns 3>