vmware player and linux kvm are both examples of what type of hypervisor?

A hypervisor is a computer software that helps manage the multiple logical partitions of a single hardware host computer so that it can run multiple guest operating systems simultaneously. This document is intended to give an overview of various types of hypervisors and their use. A hypervisor is akin to a minimal layer or OS, which manages the interaction between the guest OSs and hardware exteriors.

We will first define what we consider to be ‘hypervisor’. Then, we will discuss each type of hypervisor in detail, including virtualization type (paravirtualization), centralized management (C-type), and more.

To begin with, hypervisor is a software layer which runs directly on the system hardware and allows multiple operating systems (OS) to work at the same time on a single hardware machine.

“Hypervisor” is a hypervisor or software layer which runs directly on the system hardware and allows multiple operating systems to work at the same time on a single hardware machine. Hypervisors are capable of virtualization, in other words, they are able to run multiple instances of different OSs at once while sharing a single CPU and other hardware resources. This raises certain implications in terms of security since if any one instance becomes compromised then it could acquire access to all information, applications and even storage present in other virtualized OSs.

This document is intended to give an overview of various types of hypervisors, their use and the associated benefits.

Awareness of hypervisor dates back to the early days of personal computers. In the early 1980s, Intel 80386SX by Intel Corporation was the first commercial processor that came with integrated hardware support for virtual memory and paging support. This support was implemented as an extension of the CPU’s architecture and operating system software. This helps protect OSs from unintentional write-access by application code (program). When a system crashes, those instances of stripped-down OS which had been running remain intact, but cannot see or interact with each other because they have been running in different physical systems.

In 1984, an OS known as Concurrent CP/M operating system was developed by Connectix, a company founded by former Apple engineer Steve Jacks. The software allowed the CP/M OS to run on a standard 80286 IBM PC. In 1988, another variant of Concurrent DOS was released but it still required an 80286 CPU. However this version of the DOS did support multiple x86 processors and could therefore run CP/M applications in parallel. In 1994, Connectix released virtual machine software for Windows 3.x and later versions of Windows. This software enabled a PC to run multiple instances of a DOS operating system simultaneously without any other changes except for the addition of extra memory and disk space. This achieved the same effect as running multiple instances of CP/M, but did not require the booting of a separate DOS system image on the host OS.

An important event during this time was Xeno’s original announcement and release of their own Xen virtual machine monitor. This included support for paravirtualization, thus allowing guest OSs to run with hardware support for virtualization while remaining agnostic to any underlying hypervisor. The Xen project followed up with a Paravirtualized Linux kernel (Linux-PV) in September 1999 and FreeBSD, NetBSD, OpenSolaris, QNX Neutrino and Windows XP with native Linux-PV support were released in 2007. Another important event was the release of virtual machine monitor for Windows NT, XenServer in 2002.

The first commercially available hypervisor, QEMU was introduced to the open source world in 2003. This project’s founders were full-time employees of IBM and had started their own open source project because of various disagreements with IBM’s management regarding their personal work on virtualization technologies. The first publicly available version of this software, 2.0, was released as open source in December 2004 and includes support for both QNX and Linux-PV.

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