1.Security: KVM uses a combination of security enhanced Linux (SELinux) and secure virtualization (sVirt) for enhanced VM security and isolation.SELinux establishes security boundaries around VMs. sVirt extends SELinux,capabilities,allowing Mandatory Access Control (MAC) security to be applied to guest VMs and preventing manual labeling errors.
2.Storage: KVM is able to use any storage supported by Linux,including some local disks and network attached storage (NAS). Multipath I/O may be shared by multiple hosts.Disk images support thin provisioning , allocating storage on demand rather than all up front.
3.Performance and Scalability: KVM inherits the performance of Linux , scaling to match demand load if the number of guest machines and requests increases.KVM allows the most demanding application workloads to be virtualized and is the basis for many enterprise virtualization setups,such as data centers and private clouds (via. openstack)
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