VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.
Some of the features of VirtualBox are:
- Modularity. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. This makes it easy to control it from several interfaces at once: for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely. VirtualBox also comes with a full Software Development Kit: even though it is Open Source Software, you don't have to hack the source to write a new interface for VirtualBox.
- Virtual machine descriptions in XML. The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. Virtual machine definitions can therefore easily be ported to other computers.
* VMM: fixed rare host crash when running 64-bit guests on 32-bit hosts.
* VMM: fixed host reboots under rare circumstances due to NMIs triggered by active performance counters (Linux hosts in non-VT-x/AMD-V mode only;).
* VMM: fixed out of memory guru meditation for large memory guests.
* VMM: fixed a guru meditation related to large pages.
* VMM: use new VT-x feature to keep the guest from hogging the CPU.
* Snapshots: implemented deleting the last remaining snapshot while the VM is running.
* GUI: perform the checks for exceeding the size limit of the host file system and for broken asynchronous I/O on older Linux kernels with ext4 / xfs file systems not only when starting the VM from scratch but also when starting from a saved state.
* NAT: fixed memory leak (3.2.0 regression;).
* Networking: fixed VM reset handling in e1000.
* VRDP: fixed rare crash in multimonitor configuration.
* Display: fixed occasional guest resize crash.
* Mouse: don't send relative mouse events together with absolute mouse events (3.2.10 regression; ).
* Keyboard: fixes for the USB keyboard emulation; fixes for Koran keyboards.
* Serial: don't hang if the host device would block during open.
* Serial: fixed modem status lines (Linux hosts only;).
* Graphics: Horizontal resolutions are no longer restricted to a multiple of 8 pixels (bug #2047; requires Guest Additions update).
* USB: fixed a crash with older Linux kernels and non-ASCII characters in device strings (Linux hosts only; version 3.2.8 contained an incomplete fix).
* USB: fixed a crash under rare circumstances (Windows hosts only).
* iSCSI: respond to NOP-In requests from the target immediately to avoid being disconnected if the guest is idle.
* 3D support: fixed a crash under certain circumstances.
* 3D support: fixed crashes for GLUT based apps.
* 3D support: added missing GLX 1.3 functionality.
* 2D Video acceleration: fixed potential deadlock when saving the VM state.
* Windows hosts: another fix for BSODs under certain circumstances in VBoxNetFlt.sys.
* Solaris hosts: fixed host USB DVD drive detection
* Mac OS X hosts: fixed swapped keys for certain ISO keyboard types.
* Linux hosts: added link state handling for TAP devices needed for proper operation with bridged networking on kernels 2.6.36 and above.
* Linux hosts/guests: Linux 2.6.37 fixes
* Linux Additions: properly compile the vboxvideo module if DKMS is not installed.
* Linux Additions: fixed a memory leak when accessing non-existing files on a Shared Folders.
* Windows Additions: skip none-mapped user accounts when enumerating user accounts for VM information