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docs: update virt/lexicon

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title: Lexicon
description:
published: true
date: 2022-01-18T09:26:30.045Z
date: 2022-01-18T15:27:13.558Z
tags:
editor: markdown
dateCreated: 2021-11-13T11:58:43.776Z
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# Lexicon
**Table of Contents**:
## Table of Contents
1. [Device](/virt/lexicon#device)
2. [Emulator](/virt/lexicon#emulator)
3. [Hardware-assisted virtualization](/virt/lexicon#hardware-assisted-virtualization)
4. [Hypervisor](/virt/lexicon#hypervisor)
5. [Nested-virtualization](/virt/lexicon#nested-virtualization)
6. [Paravirtualization](/virt/lexicon#paravirtualization)
7. [Virtual machine](/virt/lexicon#virtual-machine)
8. [Virtualization](/virt/lexicon#virtualization)
1. [*Device*](/virt/lexicon#device)
2. [*Emulator*](/virt/lexicon#emulator)
3. [*Hardware-assisted virtualization*](/virt/lexicon#hardware-assisted-virtualization)
4. [*Hypervisor*](/virt/lexicon#hypervisor)
5. [*Nested-virtualization*](/virt/lexicon#nested-virtualization)
6. [*Paravirtualization*](/virt/lexicon#paravirtualization)
7. [*Virtual machine*](/virt/lexicon#virtual-machine)
8. [*Virtualization*](/virt/lexicon#virtualization)
## Device
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* Model-based emulated hardware are designed after real devices, but are made out of computer code, not silicon. The i440fx and Q35 chipsets[^5] are both instances of emulated hardware. This is the slowest (but most compatible) way to provide a device to a guest. An emulated GPU is not going to be fast enough in an emulated mode to do 3D rendering.
[^5]: The Q35 chipset, contrary to i440fx, provides a PCI Express (PCIe) bus. Alas, the i440fx, despite its limitations to PCI-only, does support passthrough of PCIe devices, as long as the driver follows suit. Thanks to Stefan Reiter for pointing that out.
* Paravirtual
* Paravirtual hardware, also known as paravirtualized Virtual I/O devices or simply virtio, are also made out of computer code. Contrary to emulated hardware, they function as a generic piece of software-based hardware which doesn't replicate a specific hardware component.
[^5]: The Q35 chipset, contrary to i440fx, provides a PCI Express (PCIe) bus. Alas, the i440fx, despite its limitations to PCI-only, does support passthrough of PCIe devices, as long as the driver follows suit. Thanks to Stefan Reiter for pointing that out.
## Emulator
Emulators or virtualizers are software that provide material components similar to physical hardware, but that are made of computer code instead of silicon, -- virtual hardware --, such as virtual floppy disks.