[virt-tools-list] VMWare guestId to libvirt os-variant

[mkov]

Hello,
Please, help me to figure out how to convert VMWare guestId to libvirt
os-variant.
For example,

guestosid:
centos64Guest	
centosGuest	

os-variant:
centos6.0
centos6.1
centos6.2
centos6.3
centos6.4
centos6.5
centos7.0

The task is to start VM on KVM from disk image fom VMWare. But,
What is the best to set up as --os-variant in virt-install?

I will use --import with virt-install. Are these options using together
(--os-variant and --import)?

What exactly do --os-variant, how to test it?

Thank you in advance!