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Kvm Overview

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KVM overviewThe Kernel-based Virtual Machine (KVM) hypervisor is a full virtualization solution for Linux on x86 hardware that contains virtualization extensions (Intel VT or AMD-V).

When you install the KVM module, it creates a bare metal hypervisor on the Linux kernel. You can then load virtual machine images onto the hypervisor, running separate operating systems. The KVM architecture hosts the virtual machine images as regular Linux processes, so that each virtual machine image can use all of the features of the Linux kernel, including hardware, security, storage, and applications.

You can use any type of storage that is supported by Linux to store virtual machine images, including local disks, SCSI, or network-attached storage such as NFS and SAN. The KVM hypervisor also supports virtual machine images on shared file systems such as the Global File System (GFS2) allowing the images to be shared by multiple hosts.
With the KVM hypervisor, you can perform live migrations and move a running virtual machine between physical hosts with no interruption to service. You can save the current state of a virtual machine to disk so that you can restart running the virtual machine from its previous state at a later time.
Because the KVM architecture hosts the virtual machine images as regular Linux processes, you can use the standard Linux security measures to isolate the images and provide resource controls. The Linux kernel includes SELinux along with sVIRT to isolate virtual images. In addition, you can use control groups (cgroups) to further restrict a set of tasks to a set of resources and monitor resource use. For more information about securing your KVM environment, see KVM security.
The KVM architecture supports the memory management features of Linux. In addition, with Kernel Same-page Merging (KSM) virtual images can share memory pages. If the virtual

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