VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use. 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.
VirtualBox 5.1.22 is a maintenance release. The following items were fixed and/or added:
- VMM: fixed VERR_IEM_INSTR_NOT_IMPLEMENTED Guru Meditation under certain conditions (5.1 regression; mostly Mac OS X hosts; bugs #15693, #15801, #16274, #16569, #16663)
- VMM: fixed software virtualization on Solaris hosts (5.1.20 regression)
- Storage: fixed a potential hang under rare circumstances (bug #16677)
- Storage: fixed a potential crash under rare circumstances (asynchronous I/O disabled or during maintenance file operations like merging snapshots)
- Linux hosts: make the ALSA backend work again as well as loading the GL libraries on certain hosts (5.1.20 regression; bugs #16667, #16693)
- Linux Additions: fixed mount.vboxsf symlink problem (5.1.20 regression; bug #16670)