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VirtualBox was originally created by Innotek GmbH , which was acquired by Sun Microsystems in , which was in turn acquired by Oracle in Specifically, Innotek developed the "additions" code in both Windows Virtual PC and Microsoft Virtual Server , which enables various host—guest OS interactions like shared clipboards or dynamic viewport resizing.
Sun Microsystems acquired Innotek in February In December , VirtualBox started supporting only hardware-assisted virtualization , dropping support for Software-based one. Each guest can be started, paused and stopped independently within its own virtual machine VM. The user can independently configure each VM and run it under a choice of software-based virtualization or hardware assisted virtualization if the underlying host hardware supports this.
The host OS and guest OSs and applications can communicate with each other through a number of mechanisms including a common clipboard and a virtualized network facility. Guest VMs can also directly communicate with each other if configured to do so. Making use of these facilities, VirtualBox can run each guest VM in its own separate address-space; the guest OS ring 0 code runs on the host at ring 0 in VMX non-root mode rather than in ring 1. Starting with version 6. It thus supports disks created by other hypervisor software.
VirtualBox can also connect to iSCSI targets and to raw partitions on the host, using either as virtual hard disks. The emulated network cards allow most guest OSs to run without the need to find and install drivers for networking hardware as they are shipped as part of the guest OS.
A special paravirtualized network adapter is also available, which improves network performance by eliminating the need to match a specific hardware interface, but requires special driver support in the guest. Many distributions of Linux ship with this driver included. Bridged networking via a host network adapter or virtual networks between guests can also be configured. Up to 36 network adapters can be attached simultaneously, but only four are configurable through the graphical interface.
A USB 1. The proprietary extension pack adds a USB 2. In the absence of hardware-assisted virtualization, versions 6. This mode supports bit guest OSs which run in rings 0 and 3 of the Intel ring architecture. VirtualBox also contains a dynamic recompiler , based on QEMU to recompile any real mode or protected mode code entirely e.
Using these techniques, VirtualBox can achieve a performance comparable to that of VMware. The feature was dropped starting with VirtualBox 6. The supported operating systems include: [66]. Some features require the installation of the closed-source "VirtualBox Extension Pack": [2]. Personal use is free but commercial users need to purchase a license. Oracle routinely checks log files for downloads of the VirtualBox Extension Pack from nonresidential IP addresses and contacts unlicensed users to enforce compliance.
While Guest Additions are installed within each suitable guest virtual machine, the Extension Pack is installed on the host running VirtualBox.
Prior to version 4, there were two different packages of the VirtualBox software. The full package was offered gratis under the PUEL, with licenses for other commercial deployment purchasable from Oracle.
This removed the same proprietary components not available under GPLv2. Although VirtualBox has experimental support for macOS guests, the end user license agreement of macOS does not permit the operating system to run on non-Apple hardware, and this is enforced within the operating system by calls to the Apple System Management Controller SMC in all Apple machines, which verifies the authenticity of the hardware.
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Free and open-source software portal. Retrieved 20 April Retrieved Genode Labs. Retrieved 19 March Oracle Corporation. Newsgroup : microsoft. Sun Microsystems. Archived from the original on Sun Microsystems, Inc. Retrieved 6 March Oracle Virtualization Blog. Guest Additions". Virtual networking". Configuring Virtual Machines". VirtualBox 4. Diedrich, Oliver VMware Workstation 7. First Steps". Retrieved 31 October Configuring virtual machines".
Retrieved 10 October Known limitations". Non-reusable licenses. Boston, Massachusetts : Free Software Foundation. Nonfree Software Licenses. Virtualization software. Comparison of platform virtualization software. Docker lmctfy rkt. Rump kernel User-mode Linux vkernel. BrandZ cgroups chroot namespaces seccomp. Sun Microsystems acquired by Oracle. SCPs BlueJ.
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