[Lava-users] about qemu device dictionary config

I am building lava test system and currently add new addvice. According to document than step of "Adding a dictionary to the first QEMU device",follow config items neet to write to .jianja2 file. {% extends 'qemu.jinja2' %} {% set mac_addr = '52:54:00:12:34:59' %} {% set memory = '1024' %}

Which file is to be writen to above config items ?does its directory path must be at path:/etc/lava-server/dispatcher-config/device-types/? How to make these items take effect immediatly?which command to use to take effect above config items? the document is not said.