core-agent-linux/vm-systemd/qubes-dvm.service

[Unit]
Description=Prepare Qubes DispVM Template
ConditionPathExists=/var/run/qubes-service/qubes-dvm
After=systemd-readahead-replay.service qubes-gui-agent.service
Wants=qubes-gui-agent.service
Before=xendriverdomain.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/lib/qubes/init/prepare-dvm.sh

[Install]
WantedBy=multi-user.target