libvirt users - Jun 2016 - Prevent guest to host CPU overloads

Hello,

I have a domain on a host that makes it to get on a overload, i.g. host
stops responding.
The host is a Fedora 22 with follow packages:

QEMU emulator version 2.3.0
libvirtd (libvirt) 1.2.13.1

VM is a MS Windows environment...

I followed some info on libvirtd wiki but cannot get the idea to limit
guest resources into libvirt or get guest limits to enforce host has
priority.

Must iothread and iops limits be sufficient?

I attach some domain info.

Thanks in advance.