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^ See [20] for a paper comparing performance of paravirtualization approaches (e.g. Xen) with OS-level virtualization ^ Requires patches/recompiling. ^ Exceptional for lightweight, paravirtualized , single-user VM/CMS interactive shell: largest customers run several thousand users on even single prior models.
VirtualBox, first released in January 2007, used some of QEMU's virtual hardware devices, and had a built-in dynamic re-compiler based on QEMU. As with KQEMU, VirtualBox runs nearly all guest code natively on the host via the VMM (Virtual Machine Manager) and uses the re-compiler only as a fallback mechanism – for example, when guest code ...
Kernel-based Virtual Machine (KVM) is a free and open-source virtualization module in the Linux kernel that allows the kernel to function as a hypervisor. It was merged into the mainline Linux kernel in version 2.6.20, which was released on February 5, 2007. [ 1 ]
GNOME Boxes was initially introduced as beta software in GNOME 3.3 (development branch for 3.4) as of Dec 2011, [5] and as a preview release in GNOME 3.4. [6] Its primary functions were as a virtual machine manager, remote desktop client (over VNC), and remote filesystem browser, utilizing the libvirt, libvirt-glib, and libosinfo technologies. [7]
VirtualBox also contains a dynamic recompiler, based on QEMU to recompile any real mode or protected mode code entirely (e.g. BIOS code, a DOS guest, or any operating system startup). [42] Using these techniques, VirtualBox could achieve performance comparable to that of VMware in its later versions. [43] [44]
In computer networking, TUN and TAP are kernel virtual network devices. Being network devices supported entirely in software, they differ from ordinary network devices which are backed by physical network adapters.
Proxmox VE is an open-source server virtualization platform to manage two virtualization technologies: Kernel-based Virtual Machine (KVM) for virtual machines and LXC for containers - with a single web-based interface. [11]
L 4 Linux is a variant of the Linux kernel for operating systems, that is altered to the extent that it can run paravirtualized on an L4 microkernel, where the L4Linux kernel runs a service.