If you want to test it yourself, I run the following command on domU 'ssh00'

# while [ 1 ]; do logger -p kern.alert `date`; date; sleep 1; done

Which shows output on domU 'ssh' login as well as on dom0's 'virsh console'

dom0:
Apr 27 09:36:02 ssh00.unix lundman: Tue Apr 27 09:36:02 JST 2010
Apr 27 09:36:03 ssh00.unix lundman: Tue Apr 27 09:36:03 JST 2010
domU:
Tue Apr 27 09:36:02 JST 2010
Tue Apr 27 09:36:03 JST 2010

I disconnect "virsh console":

Apr 27 09:36:04 ssh00.unix lundman: Tue Apr 27 09:36:04 JST 2010
xen01:~# 

and domU keeps running:

Tue Apr 27 09:36:05 JST 2010
Tue Apr 27 09:36:06 JST 2010
Tue Apr 27 09:36:07 JST 2010
[...]

until:

Tue Apr 27 09:36:58 JST 2010
Tue Apr 27 09:36:59 JST 2010
Tue Apr 27 09:37:00 JST 2010

and it is dead. You can not even ping the server.

We connect back on "virsh console":

xen01:~# virsh console ssh00.unix
Apr 27 09:36:05 ssh00.unix lundman: Tue Apr 27 09:36:05 JST 2010
Apr 27 09:36:06 ssh00.unix lundman: Tue Apr 27 09:36:06 JST 2010
[...]
Apr 27 09:37:00 ssh00.unix lundman: Tue Apr 27 09:37:00 JST 2010
Apr 27 09:37:27 ssh00.unix lundman: Tue Apr 27 09:37:27 JST 2010

(Bit of a pause there, 27 seconds gone?)

and domU also resumes:

Tue Apr 27 09:37:27 JST 2010
^C
-- 
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