While not new, some people have confusion about how the Hyper-V host communicates simple string data with the VM.
This is part of the Integration Services, specifically Data Exchange.
<VM Properties as seen from the host>
<Services within the VM>
NOTE: Do not mix this up with Guest Services, which allow files to be passed between host and VM.
The data exchange is done via a Key-Value Pair (KVP).
This data is passed to Windows based VMs by writing to the VM’s registry.
For Linux based VMs, a daemon process named hv_kvp_daemon is utilized. The data is saved directly to the Linux file system.
NOTE: Information about the host is updated if the VM is migrated to a different host.