File 80-qemu-ga.rules of Package qemu
SUBSYSTEM=="virtio-ports", ATTR{name}=="org.qemu.guest_agent.0", TAG+="systemd", ENV{SYSTEMD_WANTS}+="qemu-ga@virtio\\x2dports-org.qemu.guest_agent.0.service"
SUBSYSTEM=="virtio-ports", ATTR{name}=="org.qemu.guest_agent.0", TAG+="systemd", ENV{SYSTEMD_WANTS}+="qemu-ga@virtio\\x2dports-org.qemu.guest_agent.0.service"