A Brief Introduction To Virtualization Technologies Yin Yunqiao HP

Virtualization In computing, virtualization is a broad term that refers to the abstraction of computer resources. Platform virtualization Resource virtualization

Platform Virtualization Emulation or simulation Native virtualization and full virtualization Hardware enabled virtualization Partial virtualization Paravirtualization Operating system-level virtualization Application Virtualization

Emulation or simulation allowing an unmodified "guest" OS for a completely different CPU to be run. Examples:  Bochs  PearPC  VirtualPC  QEMU(without acceleration)‏

Native and Full Virtualization the virtual machine simulates enough hardware to allow an unmodified "guest" OS (one designed for the same CPU) to be run in isolation. Examples:  VirtualBox  Virtual PC  Vmware  QEMU  Win4Lin  XEN/Virtual Iron

Hardware enabled virtualization the virtual machine has its own hardware and allows a guest OS to be run in isolation. Intel VT (IVT)‏ AMD virtualization (AMD-V)‏ Examples:  VMware Fusion  Parallels Desktop for Mac  Parallels Workstation

Partial virtualization the virtual machine simulates multiple instances of much (but not all) of an underlying hardware environment, particularly address spaces.

Paravirtualization the virtual machine does not necessarily simulate hardware, but instead (or in addition) offers a special API that can only be used by modifying the "guest" OS. Terminologies  Hypervisor, hypercall  Enomalism Examples:  XEN, KVM, Win4Lin 9x

Operating system-level virtualization virtualizing a physical server at the operating system level, enabling multiple isolated and secure virtualized servers to run on a single physical server. Examples:  Parallels Workstation  Linux-VServer, Virtuozzo  OpenVZ, Solaris Containers  FreeBSD Jails  Chroot ?

Application Virtualization typically for the purpose allowing application binaries to be portably run on many different computer architectures and operating systems. ication_Virtual_Machines ication_Virtual_Machines Examples: .NET CLR  JVM  Script Languages:Python,Ruby,Javascript...

Resource Virtualization RAID SAN Channel bondings VPN/NAT Multiprocessor and multi-core Cluster and Grid computing Partitioning

Virtualization Under Linux(1)‏ UML (User Mode Linux)  KVM (Kernal-based Virtual Machine)‏  From Linux  XEN

Virtualization Under Linux(2)‏ QEMU  QEMU Accelerators  KQEMU  QVM86  VirtualBox (released in January 2007)‏  KVM with QEMU

Virtualization Under Linux(3)‏ Bochs (GPLed, very slow)‏  A portable x86 and AMD64 PCs emulator mostly written in C++ and distributed as free software under GPL.  VirtualBox(commercial&open source, fast)‏  VMWare (Workstation,Server,Player)‏

Virtualization Under Linux(4)‏ SWSOFT Virtualizations    Linux-VServer  Compare with:  FreeBSD Jail  Solaris Containers (Zones)‏

VMWare Virtual PC VirtualBox Bochs QEMU Linux Virtualization in Windows(1)

Linux Virtualization in Windows(2) CoLinux Cooperative Linux Topologilinux

Linux Virtualization in Windows(3) MinGW Minimalist GNU for Windows Cygwin GNUWIN32 GNUWINII UnxUtils UWIN SFU Microsoft Windows Services for UNIX,aka Interix‏

Comparison of virtual machines al_machines

History of virtualization development 1965 IBM M44/44X paging system 1965 IBM System/ virtual memory hardware 1967 IBM CP-40 (January) and CP-67 (April) time-sharing 1972 IBM VM/370 run VM under VM 1997 Connectix First version of Virtual PC 1998 VMWare U.S. Patent 6,397, VMware Virtual Platform for the Intel IA-32 architecture 2000 IBM z/VM 2001 Connectix Virtual PC for Windows 2003 Microsoft acquired Connectix 2003 EMC acquired Vmware 2003 VERITAS acquired Ejascent 2005 HP Integrity Virtual Machines 2005 Intel VT 2006 AMD VT 2005 XEN 2006 VMWare Server 2006 Virtual PC HP IVM Version Virtual Iron InnoTek VirtualBox 2007 KVM in Linux Kernel 2007 XEN in Linux Kernel

References Wikipedia for any virtualization Terminologies Virtual Linux:An overview of virtualization methods, architectures, and implementations

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