I guess it is for this:

http://www.linux-kvm.com/content/new-virtioconsole-infrastructure-introduced-kvm-84

The latest release of kvm-84 adds a new virtio console infrastructure to qemu. This is basically a new hypervisor console output in addition to the serial and parallel port consoles. You can toggle the display of these character based consoles by typing ctrl-alt-n where n is the number assigned to the console. Currently only a single virtual console is supported for the virtio-console device but the infrastructure allow for assignment of hardware based consoles in future.

Kind regards,

Jorick Astrego
Netbulae B.V.

On Thu, 2013-12-19 at 17:22 +0100, Gianluca Cecchi wrote: 
Hello,
when editing a VM I see in console section that there is an option defined as:

VirtIO Console Device Enabled

By default the checkbox is not selected.
I didn't find clear references to what this option enable/disable
inside the guest...

Thanks in advance for any clarification.

Gianluca
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