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kvm agent is running with jsvc tool.
To run the kvm agent in debug mode.
in /etc/init.d/cloudstack-agent
start() method
add -Xrunjdwp:transport=dt_socket,address=8787 after $JSVC.
it will be like $JSVC -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n -cp "$CLASSPATH"
add rule to allow 8787 port in kvm host.
iptables -I INPUT -p tcp --dport 8787 --j ACCEPT (on Rhel 6.3)
restart the management server. check the port 8787 using netstat -atnp | grep jsvc
connect the debugger from eclipse.