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.
# The following items were fixed and/or added:
* VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT caused by VMCB caching with nested paging on certain AMD CPUs
* VMM: fixed a Guru Meditation VERR_VMX_UNEXPECTED_INTERRUPTION_EXIT_TYPE while intercepting debug exceptions (VT-x only)
* VMM: fixed a Guru Meditation VERR_SVM_UNEXPECTED_EXIT while intercepting debug register accesses (AMD-V only)
* VMM: fixed a VERR_SSM_STRUCTURE_MAGIC error when trying to load a saved state made with VBox 4.3.4 when VT-x/AMD-V is disabled. Unfortunately, VBox 4.3.4 produced broken saved states for this configuration so you have to discard these states
* VMM: added a few more MSRs to the whitelist required by certain guests
* GUI: fixed deleting of inaccessible VMs (4.3 regression)
* GUI: fixed warnings in VM settings / number of guest processors
* Main: don't automatically enable 64-bit guests on 64-bit hosts if VT-x/AMD-V is not available
* Main: always expose the DMI memory information to Windows 2012 guests
* Main: fixed occasional crashes on guest display resolution change
* Main: fixed reporting back temporary name when calling IGuestSession::DirectoryCreateTemp()
* API: fix for a hang when launching a GUI VM through the API, which crashes due to GUI unavailability
* Storage: fix for BLKCACHE_IOERR runtime errors under rare circumstances
* Network: allow to start more than 5 PCNet instances
* E1000: if the cable was disconnected before the guest initialized the device, the link status was not properly set to 'down' after the initialization completed despite the fact that there was no connection
* 3D support: fixed offset of guest 3D image elements (Mac OS X Retina hosts only)
* Solaris hosts: fixed accessing the host driver from non-global zones (4.3 regression)