Raphaël Reverdy's Profile

A key challenge for full virtualization is the interception and simulation of privileged operations, such as I/O instructions. The effects of every operation performed within a given virtual machine must be kept within that virtual machine – virtual operations cannot be allowed to alter the state of any other virtual machine, the control program, or the hardware. Some machine instructions can be executed directly by the hardware, since their effects are entirely contained within the elements managed by the control program, such as memory locations and arithmetic registers. But other instructions that would "pierce the virtual machine" cannot be allowed to execute directly; they must instead be trapped and simulated. Such instructions either access or affect state information that is outside the virtual machine.

Further refinements of hardware-assisted virtualization are possible using an IOMMU; this allows native-speed access to dedicated hardware from a guest operating system, including DMA-capable hardware

"Formal Requirements for Virtualizable Third Generation Architectures", a specification for virtualization created in 1974 by Gerald J. Popek and Robert P. Goldberg.

VDI (Virtual Desktop Infrastructure

Un bureau virtuel hébergé sur le PC client crée un second environnement d'exploitation, isolé, permettant de faire fonctionner des applications anciennes, incompatibles avec un système d'exploitation moderne, ou des applications métier dans leur environnement natif

Virtualization may act as a conduit for software vendors to deliver application appliances to you preconfigured and ready to go, You just modify some settings for your environment and you are up and running.

The Future is a thin layer