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QEMU short for Quick Emulator [ citation needed ] is a free and open-source hosted hypervisor that performs hardware virtualization not to be confused with hardware-assisted virtualization. QEMU is a hosted virtual machine monitor: It also can be used with KVM to run virtual machines at near-native speed requiring hardware virtualization extensions on x86 machines.
QEMU can also do CPU emulation for user-level processes, allowing applications compiled for one architecture to run on another. However, the default is to use DirectSound. QEMU has multiple operating modes: 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. USB devices can be completely emulated mass storage from image files, input devices , or the host's USB devices can be used however, this requires administrator privileges and does not work with all devices.
Virtual disk images can be stored in a special format qcow or qcow2 that only take up disk space that the guest OS actually uses. 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 are used like KQEMU , or when some modes of its network connectivity model are utilized. The whole translation task thus consists of two parts: Optional optimisation passes are performed between them. TCG requires dedicated code written to support every architecture it runs on. It also requires that the target instruction translation be rewritten to take advantage of TCG ops, instead of the previously used dyngen ops.
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 supports the following disk image formats: For user-mode emulation QEMU maps emulated threads to host threads. This is dependent on the guest having been updated to support parallel system emulation, currently ARM and Alpha.
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 ICEs. WinUAE Amiga emulator introduced in version 3. Starting from version 2. When the firmware in the JavaStation sun4m-Architecture became version 0. From Wikipedia, the free encyclopedia.
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