VirtualBox最早是德国一家软件公司InnoTek所开发的虚拟系统软件,后来被Sun收购,改名为Sun VirtualBox,性能有很大的提高.因为他是开源的,不同于VM,而且功能强大,可以在 Linux/Mac 和 Windows 主机中运行,并 支持在其中安装 Windows (NT 4.0、2000、XP、Server 2003、Vista)、DOS/Windows 3.x、Linux (2.4 和 2.6)、OpenBSD 等系列的客户操作系统.假如你曾经有用过虚拟机软件的经历的话，相信使用 VirtualBox 不在话下。即便你是一个新手，也没有关系。VirtualBox 提供了详细的文档，可以助你在短期内入门。
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VirtualBox 2.2.0 (released 2009-04-08)
This version is a major update. The following major new features were added:
- OVF (Open Virtualization Format) appliance import and export (see chapter 3.8, Importing and exporting virtual machines, page 55)
- Host-only networking mode (see chapter 6.7, Host-only networking, page 88)
- Hypervisor optimizations with significant performance gains for high context switching rates
- Raised the memory limit for VMs on 64-bit hosts to 16GB
- VT-x/AMD-V are enabled by default for newly created virtual machines
- USB (OHCI & EHCI) is enabled by default for newly created virtual machines (Qt GUI only)
- Experimental USB support for OpenSolaris hosts
- Shared folders for Solaris and OpenSolaris guests
- OpenGL 3D acceleration for Linux and Solaris guests (see chapter 4.8, Hardware 3D acceleration (OpenGL), page 70)
- Added C API in addition to C++, Java, Python and Web Services
In addition, the following items were fixed and/or added:
- VMM: FreeBSD guest related fix for V86 flags (bug )
- VMM: fixed guru meditation when booting an AsteriskNow Linux VM (bug )
- VMM: fixed PGMPOOLKIND_FREE guru meditation (bugs , )
- VMM: fixed Windows XP boot hang (guest PAE + nested paging only)
- VMM: allow mixing of VT-x/AMD-V and software virtualization
- VMM: fixed extremely slow safe mode booting in e.g. Windows 2008 (VT-x/AMD-V only)
- VMM: significant speedup of certain GRUB boot loaders (e.g. Solaris) (VT-x/AMD-V only)
- VMM: real-mode IOPL fix for DOS guests (VT-x only)
- VMM: fixed VT-x detection with certain BIOSes that enable VT-x, but don’t set the lock bit in MSR_IA32_FEATURE_CONTROL
- VMM: fixed hibernation issues on Windows XP hosts (VT-x only; bug )
- VMM: properly emulate RDMSR from the TSC MSR, should fix some NetBSD guests
- VMM: emulate RDPMC; fixes Windows guests crashes when using the Kaspersky virus scanner (bug )
- NAT: fixed truncated downloads (FTP) (bug )
- NAT: blocked UDP packets caused a crash (bug )
- NAT: allow to configure the next server and the boot file via VBoxManage (bug )
- IDE: fixed hard disk upgrade from XML-1.2 settings (bug )
- Hard disk: support more VMDK file variants (including fixed-size ESX server images)
- Hard disks: refuse to start the VM if a disk image is not writable
- USB: further reduced host CPU utilization for OHCI and EHCI; the “VBoxInternal/Devices/usb-ohci/0/Config/FrameRate” CFG key is no longer necessary and no longer supported
- USB: fixed BSOD on the host with certain USB devices (Windows hosts only; bug #1654)
- E1000: properly handle cable disconnects (bug )
- VRDP: fixed hangs when VRDP server is enabled or disabled in runtime
- Shared folders: respect umask settings on Linux, OSX and Solaris hosts when creating files
- X11 guests: prevented setting the locale in vboxmouse, as this caused problems with Turkish locales (bug )
- X11 guests: show the guest mouse pointer at the right position if the virtual desktop is larger than the guest resolution (bug )
- Linux additions: fixed typo when detecting Xorg 1.6 (bug )
- Solaris guests: added xpg4/xcu4 dependency to the guest additions installer (bug #3524)
- Windows guests: bind the VBoxMouse.sys filter driver to the correct guest pointing device (bug )
- Windows hosts: fixed BSOD when starting a VM with enabled host interface (bug )
- Linux hosts: do proper reference counting to prevent unloading the vboxnetflt module as long as this code is in use (bug )
- Linux hosts: do not leave zombies of VBoxSysInfo.sh (bug )
- Linux installers: fixes for Slackware, Arch Linux and Linux from Scratch systems
- Windows installers: combined installer executable which contains both (32- and 64-bit) architectures.
- VBoxManage: less cryptic command-line error messages
- VBoxManage list vms commands now default to compact format
- VBoxManage controlvm dvdattach did not work if the image was attached before
- VBoxManage: allow creation of all supported disk image variants
- VBoxManage showvminfo: don’t spam the release log if the additions don’t support statistics information (bug )
- VBoxManage: big command line processing cleanup, the legacy single-dash options are deprecated and will be removed in the next major release, so switch to the new options now
- Hard disks: improved immutable disk support to auto-reset diff file at VM startup (related to bug )
- GUI: enable the audio adapter by default for new VMs
- GUI: warn if VT-x/AMD-V is not operational when starting a 64-bit guest
- GUI: deactivate 64-bit guest support when the host CPU does not support VT-x/AMD-V
- GUI: removed floppy icon from the status bar
- GUI: show build revision in about dialog
- GUI: fixed sticky status bar text
- GUI: improved error dialogs
- GUI: fail with an appropriate error message when trying to boot a read-only disk image (bug )
- GUI/Mac OS X: fixed disabled close button
- GUI/Windows: re-enabled support for copy and paste (Windows hosts 2.0 regression; bug )
- 3D support: added OpenGL select/feedback support (bug )
- 3D support: close OpenGL subsystem for terminated guest applications (bug )
- 3D support: fixed VM hangs when starting guests with 3D acceleration enabled (bug )
- PXE: fixed boot hangs when hardware virtualization is used (bug )
- LsiLogic: fixed problems with Solaris guests
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