[CentOS-virt] centos6.2 install Virtualization

[gang ao]

Today when I run "  yum groupinstall "Virtualization*"  " on my server ,It
retunes just like this :

Warning: Group virtualization-tools does not have any packages.
Package virt-who-0.3-3.el6.noarch already installed and latest version
Package libvirt-client-0.9.4-23.el6_2.9.i686 already installed and latest
version
Package libvirt-0.9.4-23.el6_2.9.i686 already installed and latest version
Warning: Group virtualization-platform does not have any packages.
Package virt-manager-0.9.0-7.el6.i686 already installed and latest version
Package python-virtinst-0.600.0-5.el6.noarch already installed and latest
version
Package virt-viewer-0.4.1-7.el6.i686 already installed and latest version
Package virt-top-1.0.4-3.11.el6.i686 already installed and latest version
Warning: Group virtualization-client does not have any packages.
Warning: Group virtualization does not have any packages.

What does the  "does not have any packages" mean?Is it because of my CPU
doesn't support Virtualization or because my yum resource doesn't have
the Virtualization
packages?
ths for reading and looking forward to be replied.
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