kvm

http://www.linux-kvm.org/page/Main_Page
Kernel Based Virtual Machine

paravirtualization full virualization and hardware assisted virtualization

http://www.vmware.com/files/pdf/VMware_paravirtualization.pdf

para - xen

full - vmware

hardware assist - kvm / vmware 4.0?

qemu

www.nongnu.org/qemu

open source processor emulator

full virtualization

userland utilities

qemu
qemu-io
qemu-img
qemu-nbd

kvm

relies on qemu

uses kernel modules

kvm.ko
kvm-intel.ko
kvm-amd.ko

kvm machines are started with qemu-kvm

command line

qemu-kvm \
 -name hostname \
 -M pc \
 -m 512 \
 -smp 1 \
 -boot c \
 -drive file=/path/to/device/or/image \
 -net nic,macaddr=00:11:22:33:44:55,vlan=0 \
 -net tap,vlan=0,ifname=vnet0 \
 -incoming tcp:0:4444

libvirt

virtualization API

long term stable API. methods for using xen, qemu or kvm.

provides two methods of working with virtual machines

virt-manager
virsh

virsh

virtual manager shell

[root@hypervisor0 ~]# virsh
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # list
 Id Name                 State
----------------------------------
  8 vm0                  running

virsh #