The communication between oVirt guest agent and the oVirt engine
The engine directs requests for the guest agent to VDSM.
VDSM communicates with the guest using a VirtIO channel using plain text commands in JSON format. Each command is terminated by a new line character.
VDSM/Guest Agent message structure
Each message sent by VDSM has a mandatory field
__name__ which contains the command name.
All additional fields in the message are considered arguments to the command.