Lets try to make sense out of the KVM virtual machine and this recent choice by Ubuntu. This choice is surprising to those of us who have been watching the Xen virtualization package become the darling of Virtual Machine world.
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So what does this choice mean to Ubuntu users? KVM is a bet on a slightly different, newer technology. KVM has been available as a kernel module for a year this month, where as Xen has been in public release since 2003. Xen and KVM use different techniques to provide relatively similar features. While Ubuntu has made the choice for host and kernel priority, Xen and others have decided that the guest OS takes priority over the host.