Guest's memory usage statistics & guest's IP address

[prince.pangeni]

Hi all,
I am new to KVM. I am using KVM for my M Tech final year project. In
my project I need to know VM's IP address and memory usage from host
OS itself (without SSHing into the VMs).
For VM's IP address fetching, I used "nmap -an"'s output. But, nmap -
an output doesn't work every time. It doesn't show VM in its result in
some occasion (even if vm is running).
So please help me out with the same. Is there any mechanism with which
we can obtain memory usage per vm and vm's ip address from the host os
itself.
Also, is there any procedure with which we can communicate some
information from guest to host os? If exist, how to do so?
Thanks in advance

Prince