Belkin XM Commander Manuale Utente Scaricare il pdf (Pagina 56)

microkernel is responsible for sharing CPU and memory (and sometimes other

devices) between less privileged tasks running on the system. This is similar to a

VMM, particularly a paravirtualising VMM but typically addressing a different

problem space and providing different kind of interface.

NetBSD/Xen A port of NetBSD to the Xen architecture.

Paravirtualisation An approach to virtualisation which requires modiﬁcations to the

operating system in order to run in a virtual machine. Xen uses paravirtualisation

but preserves binary compatibility for user space applications.

Shadow pagetables A technique for hiding the layout of machine memory from a

virtual machine’s operating system. Used in some VMMs to provide the illusion

of contiguous physical memory, in Xen this is used during live migration.

Virtual Machine The environment in which a hosted operating system runs, provid-

ing the abstraction of a dedicated machine. A virtual machine may be identical

to the underlying hardware (as in full virtualisation, or it may differ, as in par-

avirtualisation.

VMM Virtual Machine Monitor - the software that allows multiple virtual machines

to be multiplexed on a single physical machine.

Xen Xen is a paravirtualising virtual machine monitor, developed primarily by the

Systems Research Group at the University of Cambridge Computer Laboratory.

XenLinux Ofﬁcial name for the port of the Linux kernel that runs on Xen.

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Belkin XM Commander Manuale Utente Pagina 56