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docs: update virt/lexicon
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title: Lexicon
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title: Lexicon
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description:
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description:
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published: true
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published: true
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date: 2022-01-14T10:47:46.633Z
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date: 2022-01-17T16:32:45.665Z
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tags:
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tags:
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editor: markdown
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editor: markdown
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dateCreated: 2021-11-13T11:58:43.776Z
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dateCreated: 2021-11-13T11:58:43.776Z
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@ -65,12 +65,12 @@ Devices are computer components that can be attached to machines. They can be cl
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| *Design* | Specific | Specific | Generic |
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| *Design* | Specific | Specific | Generic |
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| *Type* | Silicon-based | Software-based | Software-based |
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| *Type* | Silicon-based | Software-based | Software-based |
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* Physical
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* **Physical**
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* Physical components refer to devices that can be attached to a system. For instance, a dedicated physical graphics card attached to a physical system can be directly attached to a virtual machine, which then becomes responsible for managing it, a technique called *passthrough*. The PCI-SIG standards provide IOMMU-related specifications to allow a host operating system to not have a driver for a particular device and passthrough the device to the guest. The guest will have a device with nearly native performance, and use the standard vendor's drivers for the device.
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* Physical components refer to devices that can be attached to a system. For instance, a dedicated physical graphics card attached to a physical system can be directly attached to a virtual machine, which then becomes responsible for managing it, a technique called *passthrough*. The PCI-SIG standards provide IOMMU-related specifications to allow a host operating system to not have a driver for a particular device and passthrough the device to the guest. The guest will have a device with nearly native performance, and use the standard vendor's drivers for the device.
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* The PCI-SIG standards also provide a way to partition compatible devices using so-called Virtual Functions (VFs). In this case, the host manages the way a physical device is used by the guest. Both host and guest must have specific device drivers. It offers nearly native performance.
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* The PCI-SIG standards also provide a way to partition compatible devices using so-called Virtual Functions (VFs). In this case, the host manages the way a physical device is used by the guest. Both host and guest must have specific device drivers. It offers nearly native performance.
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* Emulated
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* **Emulated**
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* Model-based
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* Model-based
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@ -91,3 +91,7 @@ Under this configuration, more efficient communication methods are available bet
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A virtual machine is a recreation of a real, physical, silicon-based computer using software. It performs almost exactly as a physical computer, and can thus host an operating system.
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A virtual machine is a recreation of a real, physical, silicon-based computer using software. It performs almost exactly as a physical computer, and can thus host an operating system.
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The expression "virtual machine" is often abbreviated VM. VMs are also often referred to as guests, in contrast to the hosts that host them.
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The expression "virtual machine" is often abbreviated VM. VMs are also often referred to as guests, in contrast to the hosts that host them.
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---
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*[**Go back to parent page**](https://wiki.phyllo.me/phyllomeos)*
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