openSUSE Leap Documentation › Virtualization Guide › Managing Virtual Machines with QEMU › QEMU Overview
ContentsContents
Virtualization Guide
  1. About This Manual
  2. I Introduction
    1. 1 Virtualization Technology
    2. 2 Introduction to Xen Virtualization
    3. 3 Introduction to KVM Virtualization
    4. 4 Introduction to Linux Containers
    5. 5 Virtualization Tools
    6. 6 Installation of Virtualization Components
  3. II Managing Virtual Machines with libvirt
    1. 7 Starting and Stopping libvirtd
    2. 8 Guest Installation
    3. 9 Basic VM Guest Management
    4. 10 Connecting and Authorizing
    5. 11 Managing Storage
    6. 12 Managing Networks
    7. 13 Configuring Virtual Machines
  4. III Hypervisor-Independent Features
    1. 14 Disk Cache Modes
    2. 15 VM Guest Clock Settings
    3. 16 libguestfs
  5. IV Managing Virtual Machines with Xen
    1. 17 Setting Up a Virtual Machine Host
    2. 18 Virtual Networking
    3. 19 Managing a Virtualization Environment
    4. 20 Block Devices in Xen
    5. 21 Virtualization: Configuration Options and Settings
    6. 22 Administrative Tasks
    7. 23 XenStore: Configuration Database Shared between Domains
    8. 24 Xen as a High-Availability Virtualization Host
  6. V Managing Virtual Machines with QEMU
    1. 25 QEMU Overview
    2. 26 Setting Up a KVM VM Host Server
    3. 27 Guest Installation
    4. 28 Running Virtual Machines with qemu-system-ARCH
    5. 29 Virtual Machine Administration Using QEMU Monitor
  7. VI Managing Virtual Machines with LXC
    1. 30 Linux Containers
    2. 31 Migration from LXC to libvirt-lxc
  8. Glossary
  9. A Appendix
  10. B XM, XL Toolstacks and Libvirt framework
  11. C GNU Licenses
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25 QEMU Overview

QEMU is a fast, cross-platform open source machine emulator which can emulate a huge number of hardware architectures for you. QEMU lets you run a complete unmodified operating system (VM Guest) on top of your existing system (VM Host Server).

You can also use QEMU for debugging purposes—you can easily stop your running virtual machine, inspect its state and save and restore it later.

QEMU consists of the following parts:

  • processor emulator (x86, s390x, PowerPC, Sparc)

  • emulated devices (graphic card, network card, hard disks, mice)

  • generic devices used to connect the emulated devices to the related host devices

  • descriptions of the emulated machines (PC, Power Mac)

  • debugger

  • user interface used to interact with the emulator

QEMU is central to KVM and Xen Virtualization, where it provides the general machine emulation. Xen's usage of QEMU is somewhat hidden from the user, while KVM's usage exposes most QEMU features transparently. If the VM Guest hardware architecture is the same as the VM Host Server's architecture, QEMU can take advantage of the KVM acceleration (SUSE only supports QEMU with the KVM acceleration loaded).

Apart from providing a core virtualization infrastructure and processor-specific drivers, QEMU also provides an architecture-specific user space program for managing VM Guests. Depending on the architecture this program is one of:

  • qemu-system-i386

  • qemu-system-s390x

  • qemu-system-x86_64

In the following this command is called qemu-system-ARCH; in examples the qemu-system-x86_64 command is used.

→Chapter 26 Setting Up a KVM VM Host Server←Part V Managing Virtual Machines with QEMU
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