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version 1.57, 2014/12/27 00:33:45
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version 1.58, 2014/12/27 00:36:20
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Line 4 Introduction
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Line 4 Introduction
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| [![[Xen |
[![[Xen |
| screenshot]](http://www.netbsd.org/gallery/in-Action/hubertf-xens.png)](http://www.netbsd.org/gallery/in-Action/hubertf-xen.png) |
screenshot]](http://www.netbsd.org/gallery/in-Action/hubertf-xens.png)](http://www.netbsd.org/gallery/in-Action/hubertf-xen.png) |
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| Xen is a virtual machine monitor or hypervisor for x86 hardware |
Xen is a hypervisor (or virtual machine monitor) for x86 hardware |
| (i686-class or higher), which supports running multiple guest |
(i686-class or higher), which supports running multiple guest |
| operating systems on a single physical machine. With Xen, one uses |
operating systems on a single physical machine. Xen is a Type 1 or |
| the Xen kernel to control the CPU, memory and console, a dom0 |
bare-metal hypervisor; one uses the Xen kernel to control the CPU, |
| operating system which mediates access to other hardware (e.g., disks, |
memory and console, a dom0 operating system which mediates access to |
| network, USB), and one or more domU operating systems which operate in |
other hardware (e.g., disks, network, USB), and one or more domU |
| an unprivileged virtualized environment. IO requests from the domU |
operating systems which operate in an unprivileged virtualized |
| systems are forwarded by the hypervisor (Xen) to the dom0 to be |
environment. IO requests from the domU systems are forwarded by the |
| fulfilled. |
hypervisor (Xen) to the dom0 to be fulfilled. |
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| Xen supports two styles of guests. The original is Para-Virtualized |
Xen supports two styles of guests. The original is Para-Virtualized |
| (PV) which means that the guest OS does not attempt to access hardware |
(PV) which means that the guest OS does not attempt to access hardware |
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