对于VMWare、Virtual PC这些虚拟机软件，可能大家都比较熟悉。VirtualBox是德国一家软件公司InnoTek 所开发的虚拟系统软件，它不仅具有丰富的特色，而且性能也很优异。更是开源的，成为了一个发布在GPL许可之下的自由软件。(自由软件)
Changelog:
VirtualBox 2.1.0 (released 2008-12-17)
This version is a major update. The following major new features were added:
- Support for hardware virtualization (VT-x and AMD-V) on Mac OS X hosts
- Support for 64-bit guests on 32-bit host operating systems (experimental; see user manual, chapter 1.6, 64-bit guests, page 16)
- Added support for Intel Nehalem virtualization enhancements (EPT and VPID; see user manual, chapter 1.2, Software vs. hardware virtualization (VT-x and AMD-V), page 10))
- Experimental 3D acceleration via OpenGL (see user manual, chapter 4.8, Hardware 3D acceleration (OpenGL), page 66)
- Experimental LsiLogic and BusLogic SCSI controllers (see user manual, chapter 5.1, Hard disk controllers: IDE, SATA (AHCI), SCSI, page 70)
- Full VMDK/VHD support including snapshots (see user manual, chapter 5.2, Disk image files (VDI, VMDK, VHD), page 72)
- New NAT engine with significantly better performance, reliability and ICMP echo (ping) support (bugs , , , )
- New Host Interface Networking implementations for Windows and Linux hosts with easier setup (replaces TUN/TAP on Linux and manual bridging on Windows)
In addition, the following items were fixed and/or added:
- VMM: significant performance improvements for VT-x (real mode execution)
- VMM: support for hardware breakpoints (VT-x and AMD-V only; bug )
- VMM: VGA performance improvements for VT-x and AMD-V
- VMM: Solaris and OpenSolaris guest performance improvements for AMD-V (Barcelona family CPUs only)
- VMM: fixed guru meditation while running the Dr. Web virus scanner (software virtualization only; bug )
- VMM: deactivate VT-x and AMD-V when the host machine goes into suspend mode; reactivate when the host machine resumes (Windows, Mac OS X & Linux hosts; bug )
- VMM: fixed guest hangs when restoring VT-x or AMD-V saved states/snapshots
- VMM: fixed guru meditation when executing a one byte debug instruction (VT-x only; bug )
- VMM: fixed guru meditation for PAE guests on non-PAE hosts (VT-x)
- VMM: disallow mixing of software and hardware virtualization execution in general (bug )
- VMM: fixed black screen when booting OS/2 1.x (AMD-V only)
- GUI: pause running VMs when the host machine goes into suspend mode (Windows & Mac OS X hosts)
- GUI: resume previously paused VMs when the host machine resumes after suspend (Windows & Mac OS X hosts)
- GUI: save the state of running or paused VMs when the host machine’s battery reaches critical level (Windows hosts)
- GUI: properly restore the position of the selector window when running on the compiz window manager
- GUI: properly restore the VM in seamless mode (2.0 regression)
- GUI: warn user about non optimal memory settings
- GUI: structure operating system list according to family and version for improved usability
- GUI: predefined settings for QNX guests
- IDE: improved ATAPI passthrough support
- Networking: added support for up to 8 Ethernet adapters per VM
- Networking: fixed issue where a VM could lose connectivity after a reboot
- iSCSI: allow snapshot/diff creation using local VDI file
- iSCSI: improved interoperability with iSCSI targets
- Graphics: fixed handling of a guest video memory which is not a power of two (bug )
- VBoxManage: fixed bug which prevented setting up the serial port for direct device access.
- VBoxManage: added support for VMDK and VHD image creation
- VBoxManage: added support for image conversion (VDI/VMDK/VHD/RAW)
- Solaris hosts: added IPv6 support between host and guest when using host interface networking
- Mac OS X hosts: added ACPI host power status reporting
- API: redesigned storage model with better generalization
- API: allow attaching a hard disk to more than one VM at a time
- API: added methods to return network configuration information of the host system
- Shared Folders: performance and stability fixes for Windows guests (Microsoft Office Applications)
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