KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko.

Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.

KVM is open source software. The kernel component of KVM is included in mainline Linux, as of 2.6.20. The userspace component of KVM is included in mainline QEMU, as of 1.3.

Virtualizor support KVM virtualization and it is very stable.

KVM + Virtualizor can be installed on CentOS or Ubuntu

Features of Virtualizor with KVM:

1. Migration from one node to another node
2. Multiple Storage support
3. Backups and Restore of VMs (Local, FTP, SSH backup servers)
4. Storage Overcommit (Thin LVM and File base storage)
5. Cloning of the VM
6. Internal IP configuration supported with Virtual Domain forwarding.

For full list of feature please visit the following link :

https://virtualizor.com/features

You can find the guide for how to install Virtualizor with KVM virtualization here :

https://www.virtualizor.com/docs/install/install-kvm/