I have a Windows 7 KVM guest running on a CentOS 6.9 KVM host. I would like to upgrade the host system to CentOS 7.4.1708 without having to re-install from scratch the KVM guest. What procedure should I use to move the guest off the host system, upgrade the CentOS version and then move the KVM Guest back to the host? For example, Is there a recommended way to move the KVM Guest to a USB stick and then move it back to the upgraded host? Thank you for your help.