How to upgrade CentOS 6.9 KVM host to 7.4.1708 and not re-install guests

["Paul R. Ganci" <ganci@xxxxxxxxxx>]

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.

--
Paul (ganci@xxxxxxxxxx)
Cell: (303)257-5208
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