Friday, July 04, 2008

Virtualization for Today’s Servers and Other Applications

As devices such as set-top boxes, mobile phones, servers, and others become more complex, virtualization steps in to provide the solution to make numerous OS and applications work together in a single environment. In addition to consolidation of multiple OSes and applications, virtualization also offers additional reliability and security. Better reliability comes from using fault-tolerant architectures in which one core backs up another core. Better security comes from using different security settings on each core to customize the application for the target user.

One of the challenges in running multiple OSes in a “virtual” environment is that most OSes were designed to run at the highest priority level. In most cases, the primary OS runs at the highest level and guest OSes run at lower levels.

Intel offers tools to improve virtualization. Hardware support includes a set of queues for buffering up I/O requests from the hypervisor software. Intel offers an even higher priority level for the virtualization software and lets the original OSes run in their normal mode. Also, the hardware supports memory mapping and helps manage transitions from one OS to the other through the use of registers and queues.


Best regards,
Hall T.

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