Refer below link for kvm installation:-

http://www.virtualizor.com/wiki/Install_KVM

For kvm installation the most important thing is to setup correct partitioning scheme which is describe as below,

Always select the custom layout for creating partition.

Delete all existing data on the hard disk.

After deletion the windows will look like this.

Select the Standard partition

Select the / partition of 80-100gb as mention in the kvm installation link.

Swap partition of 4gb

And most important is to create partition for LVM, click on LVM physical volume

Click on “Fill upto maximum allowable size” which will use for VPS space

After this your partition will look like this

Click write changes to disk to install CentOS

Click on next

Select minimal Desktop or Desktop (You can also select minimal in case of low disk space)

Done!

Note:

After installation create volume group on lvm partition(physical volume )and give it any name.

For pvcreate use the following command

pvcreate partition name e.g pvcreate /dev/sdb2

Physical volume "/dev/sdb2" successfully created

to check physical volume name rum command “pvdisplay”

Once you create the physical volume, you can create the volume group (VG) from these physical volumes (PV).

vgcreate  vg_name  pv_name     e.g. vgcreate  vg_group  /dev/sdb2

  Volume  group "vg_group" successfully created

to check vg created name  run command “vgdisplay”

./install.sh [email protected] kernel=kvm lvg=VOLUME_GROUP_NAME

you should give lvg = vg name created by you

Also make sure that visualization should be enabled in BIOS

Enjoy!