QEMU和KVM的差異

QEMU和KVM大致上都是相同的，但QEMU不支援原生虛擬化(Native Virtualization)
he main difference is that QEMU does not support native virtualization. Consequently, QEMU has worse performance than KVM and is a poor choice for a production deployment.


http://docs.openstack.org/grizzly/openstack-compute/admin/content/qemu.html