This page is about running PureDarwin on the QEMU emulator and is not about running Mac OS X. QEMU is a hardware emulator that can be used to run operating systems on virtualized hardware, not unlike VMware or Parallels. Office for mac error your account doesnt allow editing site:answers.microsoft.com. • Written in,, and some other platforms Website QEMU (short for Quick Emulator [ ]) is a that performs. QEMU is a: it emulates the machine's through dynamic and provides a set of different hardware and device models for the machine, enabling it to run a variety of. It also can be used with to run virtual machines at near-native speed (by taking advantage of hardware extensions such as ). QEMU can also do emulation for user-level processes, allowing applications compiled for one architecture to run on another. Contents • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Licensing [ ] QEMU was written by and is, mainly licensed under the (GPL for short). Various parts are released under the, (LGPL) or other GPL-compatible licenses. Operating modes [ ] QEMU has multiple operating modes: User-mode emulation In this mode QEMU runs single or / programs that were compiled for a different. System calls are for and for 32/64 bit mismatches. Fast cross-compilation and cross-debugging are the main targets for user-mode emulation. System emulation In this mode QEMU emulates a full computer system, including. It can be used to provide virtual hosting of several virtual computers on a single computer. QEMU can boot many guest, including,,,, and; it supports emulating several instruction sets, including,, 32-bit,,,,. KVM Hosting Here QEMU deals with the setting up and migration of KVM images. It is still involved in the emulation of hardware, but the execution of the guest is done by KVM as requested by QEMU. Best charge for mac. Xen Hosting QEMU is involved only in the emulation of hardware; the execution of the guest is done within Xen and is totally hidden from QEMU. Features [ ] 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. Format drive for mac and windows exfat. QEMU supports the emulation of various architectures, including: • (x86) PCs • PCs • Release 6 and earlier variants • Sun's sun4m • Sun's sun4u • development boards (Integrator/CP and Versatile/PB) • SHIX board • ( and ) • • • 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 all devices. Virtual disk images can be stored in a special format () that only take up disk space that the guest OS actually uses. This way, an emulated 120 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.), the user can delete the overlay and reconstruct an earlier emulated disk-image version. 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. The virtual network cards can also connect to network cards of other instances of QEMU or to local interfaces. Network connectivity can also be achieved by bridging a TUN/TAP interface used by QEMU with a non-virtual Ethernet interface on the host OS using the host OS's bridging features. QEMU integrates several services to allow the host and guest systems to communicate; for example, an integrated 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. Instead, it can allow one to access the screen of the guest OS via an integrated server. It can also use an emulated serial line, without any screen, with applicable operating systems. Simulating multiple CPUs running is possible. QEMU does not require administrative rights to run, unless additional kernel modules for improving speed are used (like ), or when some modes of its network connectivity model are utilized. Tiny Code Generator [ ] The Tiny Code Generator (TCG) aims to remove the shortcoming of relying on a particular version of or any compiler, instead incorporating the compiler (code generator) into other tasks performed by QEMU at run time. The whole translation task thus consists of two parts: 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. TCG requires dedicated code written to support every architecture it runs on.
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