‪#‎KVM‬ vs ‪#‎Qemu‬ ‪#‎Virtual‬ Machine - Explained

‪#‎KVM‬ vs ‪#‎Qemu‬ ‪#‎Virtual‬ Machine - Explained
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KVM (‪#‎Kernel‬-based Virtual Machine) is a fast growing open source full ‪#‎virtualization‬ solution for ‪#‎Linux‬ on x86 hardware containing virtualization extensions (‪#‎Intel‬ VT or ‪#‎AMD‬-V). It consists of a loadable kernel module that provides the core virtualization infrastructure and a processor specific module. Using KVM ‪#‎hypervisor‬, one can run multiple virtual machines running unmodified Linux or ‪#‎Windows‬ images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc. The kernel component of KVM hypervisor is included in mainline Linux. Since the hypervisor directly interacts with the hardware,it can be considered as a Level-1 hypervisor. This content was post on http :// www. facebook .com/geeksch00l ‪#‎UnhappyGhost‬

In this approach , a Linux Kernel is converted into a hypervisor. Once we install KVM on a Linux box a hardware file /dev/kvm is created which will act as interpreter between actual hardware and hypervisor. A normal linux process has two modes of execution,user mode and kernel mode. User mode is the default mode used by applications.When it needs any sort of involvement from the kernel like writing some data into hard disk, then the kernel mode comes in action . KVM employs a third mode,called “guest mode” which is created by “/dev/kvm” . All the processes in the guest OS will be running under guest mode. Devices in the device tree (/dev) are common to all user-space processes. But with /dev/kvm , each process that opens it sees a different map thereby provides isolation between the VMs. This content was post on http :// www. facebook .com/geeksch00l ‪#‎GeekSchool‬ ‪#‎GeekSch00l‬

KVM makes use of hardware virtualization features for cpu virtualization,and uses the standard Linux scheduler and memory management. Modified version of Qemu is used for I/O virtualization. This content was post on http :// www. facebook .com/geeksch00l

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QEMU (Quick ‪#‎Emulator‬ ) is an open source virtualization and emulation tool which perform hardware virtualization/emulation. Its cross-platform support helps you run it on several hosts ( ‪#‎x86‬, ‪#‎PowerPC‬, ‪#‎ARM‬, ‪#‎Sparc‬, ‪#‎Alpha‬ and ‪#‎MIPS‬) . It can emulate several CPUs like x86, PowerPC, ARM and Sparc. This content was post on http :// www. facebook .com/geeksch00l

Qemu works by a special re-compiler which emulates processors through dynamic ‪#‎binary‬ translation (binary translation is the emulation of one instruction set by another through translation of code) , enabling it to run a variety of unmodified guest operating systems.

QEMU has two operating modes:

User Mode Emulation (only in Linux hosts) : In this mode,a process compiled for one target CPU can be run on another CPU. For example,a PowerPC software can be run on X86 or X86_64 hosts. This approach is mainly used by developers for checking the softwares compatibility with different CPU’s. This content was post on http :// www. facebook .com/geeksch00l

System mode emulation : In this mode Qemu emulates a full computer system, including a processor and various peripherals including ‪#‎NIC‬ and graphic cards. It can be used to provide run several virtual guest VMs on a single host. QEMU can boot many guest operating systems, including Linux, ‪#‎Solaris‬, ‪#‎Microsoft‬ Windows, ‪#‎DOS‬, and ‪#‎BSD‬.

QEMU is not a good choice to be used in a production environment, since Qemu as a software is doing the entire emulation process, which makes it really slow when running multiple guest OS on a single host. This content was post on http :// www. facebook .com/geeksch00l
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