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The GUI of a vhost can only be displayed on a host on which a GUI is installed. On most KVM hosts a GUI is not installed. That's why the GUI of a vhost often cannot be displayed on a KVM server.

But access to the console of a vhost is easily possible on a kvm host. The command virsh console <vhost> is the tool of choice:

kvm5:~# virsh console client
Connected to domain client
Escape character is ^]

Debian GNU/Linux 9 cougar ttyS0

client login: admin
Password: 

Last login: Tue Apr 24 12:34:10 CEST 2018 from 10.0.0.6 on pts/2
Linux client 4.9.0-6-amd64 #1 SMP Debian 4.9.82-1+deb9u3 (2018-03-02) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
admin@client:~$ sudo -i
client:~# 

The picture above shows the access to a serial console ('ttyS0') of a vhost named 'client'. This only works, when a serial console was added to the vhost as described on this page.

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