qemu guest agent(QGA) in guest OS

[Henry lol <pub.virtualization@xxxxxxxxx>]

Hello,

AFAIK, QGA is automatically installed and run in guest OS after installing OS from iso file whereas it's not installed in case of installing OS on the host even with same iso and configuration.

So, I am wondering how it works differently depending on the guest or host.

Does the OS installer selectively install packages?

thanks.