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<li class="toctree-l1 current"><a class="current reference internal" href="#">About QEMU</a><ul>
<li class="toctree-l2"><a class="reference internal" href="build-platforms.html">Supported build platforms</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html">Deprecated features</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../system/index.html">System Emulation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../user/index.html">User Mode Emulation</a></li>
<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">Tools</a></li>
<li class="toctree-l1"><a class="reference internal" href="../interop/index.html">System Emulation Management and Interoperability</a></li>
<li class="toctree-l1"><a class="reference internal" href="../specs/index.html">System Emulation Guest Hardware Specifications</a></li>
<li class="toctree-l1"><a class="reference internal" href="../devel/index.html">Developer Information</a></li>
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<h1>About QEMU<a class="headerlink" href="#about-qemu" title="Permalink to this headline">¶</a></h1>
<p>QEMU is a generic and open source machine emulator and virtualizer.</p>
<p>QEMU can be used in several different ways. The most common is for
“system emulation”, where it provides a virtual model of an
entire machine (CPU, memory and emulated devices) to run a guest OS.
In this mode the CPU may be fully emulated, or it may work with
a hypervisor such as KVM, Xen, Hax or Hypervisor.Framework to
allow the guest to run directly on the host CPU.</p>
<p>The second supported way to use QEMU is “user mode emulation”,
where QEMU can launch processes compiled for one CPU on another CPU.
In this mode the CPU is always emulated.</p>
<p>QEMU also provides a number of standalone commandline utilities,
such as the <code class="docutils literal notranslate"><span class="pre">qemu-img</span></code> disk image utility that allows you to create,
convert and modify disk images.</p>
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<li class="toctree-l1"><a class="reference internal" href="build-platforms.html">Supported build platforms</a><ul>
<li class="toctree-l2"><a class="reference internal" href="build-platforms.html#supported-host-architectures">Supported host architectures</a></li>
<li class="toctree-l2"><a class="reference internal" href="build-platforms.html#linux-os-macos-freebsd-netbsd-openbsd">Linux OS, macOS, FreeBSD, NetBSD, OpenBSD</a></li>
<li class="toctree-l2"><a class="reference internal" href="build-platforms.html#windows">Windows</a></li>
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<li class="toctree-l1"><a class="reference internal" href="deprecated.html">Deprecated features</a><ul>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#system-emulator-command-line-arguments">System emulator command line arguments</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#qemu-machine-protocol-qmp-commands">QEMU Machine Protocol (QMP) commands</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#system-accelerators">System accelerators</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#system-emulator-cpus">System emulator CPUS</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#qemu-api-qapi-events">QEMU API (QAPI) events</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#system-emulator-machines">System emulator machines</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#backend-options">Backend options</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#device-options">Device options</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#linux-user-mode-cpus">linux-user mode CPUs</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#backwards-compatibility">Backwards compatibility</a></li>
<li class="toctree-l2"><a class="reference internal" href="deprecated.html#guest-emulator-isas">Guest Emulator ISAs</a></li>
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<li class="toctree-l1"><a class="reference internal" href="removed-features.html">Removed features</a><ul>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#system-emulator-command-line-arguments">System emulator command line arguments</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#qemu-machine-protocol-qmp-commands">QEMU Machine Protocol (QMP) commands</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#human-monitor-protocol-hmp-commands">Human Monitor Protocol (HMP) commands</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#guest-emulator-isas">Guest Emulator ISAs</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#system-emulator-cpus">System emulator CPUS</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#system-emulator-machines">System emulator machines</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#linux-user-mode-cpus">linux-user mode CPUs</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#system-emulator-devices">System emulator devices</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#related-binaries">Related binaries</a></li>
<li class="toctree-l2"><a class="reference internal" href="removed-features.html#block-devices">Block devices</a></li>
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<li class="toctree-l1"><a class="reference internal" href="license.html">License</a></li>
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