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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. [citation needed] Starting with version 6.1, VirtualBox only supports this method.
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 executes in real mode. [22] In addition, VirtualBox did a lot of code analysis and patching using a built-in disassembler to minimize recompilation.
It exposes the /dev/kvm interface, which a user mode host can then use to: Set up the guest VM's address space. The host must also supply a firmware image (usually a custom BIOS when emulating PCs) that the guest can use to bootstrap into its main OS. Feed the guest simulated I/O. Map the guest's video display back onto the system host.
A hypervisor, also known as a virtual machine monitor (VMM) or virtualizer, is a type of computer software, firmware or hardware that creates and runs virtual machines.A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine.
The physical, "real-world" hardware running the VM is generally referred to as the 'host', and the virtual machine emulated on that machine is generally referred to as the 'guest'. A host can emulate several guests, each of which can emulate different operating systems and hardware platforms.
No host OS, Linux or Windows as dev. hosts Linux, eCos, μC/OS-II, WindowsCE, Nucleus, VxWorks Proprietary: User Mode Linux: Jeff Dike, other developers x86, x86-64, PowerPC Same as host Linux Linux GPL version 2: VirtualBox: Innotek, acquired by Oracle Corporation: x86, x86-64 x86, x86-64 (with Intel VT-x or AMD-V, and VirtualBox 2 or later)
By treating each guest-physical address as a host-virtual address, a slight extension of the hardware used to walk a non-virtualized page table (now the guest page table) can walk the host page table. With multilevel page tables the host page table can be viewed conceptually as nested within the guest page table. A hardware page table walker ...
The host in this article is the system running the emulator, and the guest is the system being emulated. The list is organized by guest operating system (the system being emulated), grouped by word length .