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QEMU is a free and open-source emulator. It emulates the machine’s processor through dynamic binary translation and provides a set of different hardware and device models for the machine, enabling it to run a variety of guest operating systems. QEMU can also do emulation for user-level processes, allowing applications compiled for one architecture to run on another.

QEMU has multiple operating modes: [6]. QEMU can save and restore the state of the virtual machine with all programs running. Guest operating systems do not need patching in order to run inside QEMU.

The virtual machine can interface with many types of physical host hardware, including the user’s hard disks, CD-ROM drives, network cards, audio interfaces, and USB devices. USB devices can be completely emulated, or the host’s USB devices can be used, although this requires administrator privileges and does not work with some devices.

Virtual disk images can be stored in a special format qcow or qcow2 that only takes up as much disk space as the guest OS actually uses. This way, an emulated GB disk may occupy only a few hundred megabytes on the host. The QCOW2 format also allows the creation of overlay images that record the difference from another unmodified base image file. This provides the possibility for reverting the emulated disk’s contents to an earlier state. For example, a base image could hold a fresh install of an operating system that is known to work, and the overlay images are used.

Should the guest system become unusable through virus attack, accidental system destruction, etc. QEMU can emulate network cards of different models which share the host system’s connectivity by doing network address translation, effectively allowing the guest to use the same network as the host. QEMU integrates several services to allow the host and guest systems to communicate; for example, an integrated SMB server and network-port redirection to allow incoming connections to the virtual machine.

It can also boot Linux kernels without a bootloader. QEMU does not depend on the presence of graphical output methods on the host system. It can also use an emulated serial line, without any screen, with applicable operating systems. QEMU does not require administrative rights to run unless additional kernel modules for improving speed like KQEMU are used or certain modes of its network connectivity model are utilized. The whole translation task thus consists of two parts: basic blocks of target code TBs being rewritten in TCG ops – a kind of machine-independent intermediate notation, and subsequently this notation being compiled for the host’s architecture by TCG.

Optional optimisation passes are performed between them, for a just-in-time compiler JIT mode. It also requires updating the target code to use TCG ops instead of the old dyngen ops.

It replaces the dyngen , which relied on GCC 3. This worked by running user mode code and optionally some kernel code directly on the host computer’s CPU, and by using processor and peripheral emulation only for kernel-mode and real-mode code. KQEMU was initially a closed-source product available free of charge, but starting from version 1. QEMU versions starting with 0. The developers of QVM86 ceased development in January, QEMU also supports the following accelerators: [16].

QEMU supports the following disk image formats: [17]. For user-mode emulation QEMU maps emulated threads to host threads. VirtualBox is free and open-source available under GPL , except for certain features. QEMU includes several components: CPU emulators, emulated devices, generic devices, machine descriptions, user interface, and a debugger.

Hardware is emulated via a QEMU “device model” daemon running as a backend in dom0. This can be used as a cheap replacement for hardware in-circuit emulators ICE. Unlike QEMU, Unicorn focuses on the CPU only : no emulation of any peripherals is provided and raw binary code outside of the context of an executable file or a system image can be run directly.

Unicorn is thread-safe and has multiple bindings and instrumentation interfaces. Starting from version 2. When the firmware in the JavaStation sun4m-Architecture became version 0.

Supported peripherals: From the Milkymist SoC. From Wikipedia, the free encyclopedia. Free virtualization and emulation software. This article is about the virtual machine monitor.

Free and open-source software portal. Retrieved 20 April The Register. Archived from the original on Retrieved February 6, QEMU 5. QEMU developers. Linux Tips. IEEE Micro. S2CID English Amiga Board. Unicorn Engine.

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