RHEL 6, CENTOS6

Installing HVM in xen

Use this command to confirm about your processor support for Virtulization

xm dmesg | grep -i hvm

if you are using intel processor with virtulization supoort you will get this result
(XEN) HVM: VMX enabled

Installing HVM Guest : 

> Create Harddisk image for guest 

dd if=/dev/zero of=/home/xen1.example.com.img bs=1024k count=4000