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              <p class="caption"><span class="caption-text">Contents:</span></p>
<ul class="current">
<li class="toctree-l1 current"><a class="reference internal" href="index.html">About QEMU</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="build-platforms.html">Supported build platforms</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">Deprecated features</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#system-emulator-command-line-arguments">System emulator command line arguments</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#qemu-audio-environment-variables-and-audio-help-since-4-0"><code class="docutils literal notranslate"><span class="pre">QEMU_AUDIO_</span></code> environment variables and <code class="docutils literal notranslate"><span class="pre">-audio-help</span></code> (since 4.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#creating-sound-card-devices-and-vnc-without-audiodev-property-since-4-2">Creating sound card devices and vnc without <code class="docutils literal notranslate"><span class="pre">audiodev=</span></code> property (since 4.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#creating-sound-card-devices-using-soundhw-since-5-1">Creating sound card devices using <code class="docutils literal notranslate"><span class="pre">-soundhw</span></code> (since 5.1)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#chardev-backend-aliases-tty-and-parport-since-6-0"><code class="docutils literal notranslate"><span class="pre">-chardev</span></code> backend aliases <code class="docutils literal notranslate"><span class="pre">tty</span></code> and <code class="docutils literal notranslate"><span class="pre">parport</span></code> (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#short-form-boolean-options-since-6-0">Short-form boolean options (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#delay-option-for-socket-character-devices-since-6-0"><code class="docutils literal notranslate"><span class="pre">delay</span></code> option for socket character devices (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#enable-fips-since-6-0"><code class="docutils literal notranslate"><span class="pre">--enable-fips</span></code> (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#writeconfig-since-6-0"><code class="docutils literal notranslate"><span class="pre">-writeconfig</span></code> (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#userspace-local-apic-with-kvm-x86-since-6-0">Userspace local APIC with KVM (x86, since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#hexadecimal-sizes-with-scaling-multipliers-since-6-0">hexadecimal sizes with scaling multipliers (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#spice-password-string-since-6-0"><code class="docutils literal notranslate"><span class="pre">-spice</span> <span class="pre">password=string</span></code> (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#opened-property-of-rng-objects-since-6-0"><code class="docutils literal notranslate"><span class="pre">opened</span></code> property of <code class="docutils literal notranslate"><span class="pre">rng-*</span></code> objects (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#loaded-property-of-secret-and-secret-keyring-objects-since-6-0"><code class="docutils literal notranslate"><span class="pre">loaded</span></code> property of <code class="docutils literal notranslate"><span class="pre">secret</span></code> and <code class="docutils literal notranslate"><span class="pre">secret_keyring</span></code> objects (since 6.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#display-sdl-window-close-since-6-1"><code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,window_close=...</span></code> (since 6.1)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#no-quit-since-6-1"><code class="docutils literal notranslate"><span class="pre">-no-quit</span></code> (since 6.1)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#alt-grab-and-display-sdl-alt-grab-on-since-6-2"><code class="docutils literal notranslate"><span class="pre">-alt-grab</span></code> and <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,alt_grab=on</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#ctrl-grab-and-display-sdl-ctrl-grab-on-since-6-2"><code class="docutils literal notranslate"><span class="pre">-ctrl-grab</span></code> and <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,ctrl_grab=on</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#sdl-since-6-2"><code class="docutils literal notranslate"><span class="pre">-sdl</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#curses-since-6-2"><code class="docutils literal notranslate"><span class="pre">-curses</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#watchdog-since-6-2"><code class="docutils literal notranslate"><span class="pre">-watchdog</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#smp-parameter-0-smp-configurations-since-6-2"><code class="docutils literal notranslate"><span class="pre">-smp</span></code> (“parameter=0” SMP configurations) (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#plugin-argument-passing-through-arg-string-since-6-1">Plugin argument passing through <code class="docutils literal notranslate"><span class="pre">arg=&lt;string&gt;</span></code> (since 6.1)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#drive-if-none-for-the-sifive-u-otp-device-since-6-2"><code class="docutils literal notranslate"><span class="pre">-drive</span> <span class="pre">if=none</span></code> for the sifive_u OTP device (since 6.2)</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="#qemu-machine-protocol-qmp-commands">QEMU Machine Protocol (QMP) commands</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#blockdev-open-tray-blockdev-close-tray-argument-device-since-2-8"><code class="docutils literal notranslate"><span class="pre">blockdev-open-tray</span></code>, <code class="docutils literal notranslate"><span class="pre">blockdev-close-tray</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#eject-argument-device-since-2-8"><code class="docutils literal notranslate"><span class="pre">eject</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#blockdev-change-medium-argument-device-since-2-8"><code class="docutils literal notranslate"><span class="pre">blockdev-change-medium</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#block-set-io-throttle-argument-device-since-2-8"><code class="docutils literal notranslate"><span class="pre">block_set_io_throttle</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#blockdev-add-empty-string-argument-backing-since-2-10"><code class="docutils literal notranslate"><span class="pre">blockdev-add</span></code> empty string argument <code class="docutils literal notranslate"><span class="pre">backing</span></code> (since 2.10)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#block-commit-arguments-base-and-top-since-3-1"><code class="docutils literal notranslate"><span class="pre">block-commit</span></code> arguments <code class="docutils literal notranslate"><span class="pre">base</span></code> and <code class="docutils literal notranslate"><span class="pre">top</span></code> (since 3.1)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#nbd-server-add-and-nbd-server-remove-since-5-2"><code class="docutils literal notranslate"><span class="pre">nbd-server-add</span></code> and <code class="docutils literal notranslate"><span class="pre">nbd-server-remove</span></code> (since 5.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#query-qmp-schema-return-value-member-values-since-6-2"><code class="docutils literal notranslate"><span class="pre">query-qmp-schema</span></code> return value member <code class="docutils literal notranslate"><span class="pre">values</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#drive-backup-since-6-2"><code class="docutils literal notranslate"><span class="pre">drive-backup</span></code> (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#incorrectly-typed-device-add-arguments-since-6-2">Incorrectly typed <code class="docutils literal notranslate"><span class="pre">device_add</span></code> arguments (since 6.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#query-sgx-return-value-member-section-size-since-7-0"><code class="docutils literal notranslate"><span class="pre">query-sgx</span></code> return value member <code class="docutils literal notranslate"><span class="pre">section-size</span></code> (since 7.0)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#query-sgx-capabilities-return-value-member-section-size-since-7-0"><code class="docutils literal notranslate"><span class="pre">query-sgx-capabilities</span></code> return value member <code class="docutils literal notranslate"><span class="pre">section-size</span></code> (since 7.0)</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="#system-accelerators">System accelerators</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#mips-trap-and-emul-kvm-support-since-6-0">MIPS <code class="docutils literal notranslate"><span class="pre">Trap-and-Emul</span></code> KVM support (since 6.0)</a></li>
</ul>
</li>
<li class="toctree-l3"><a class="reference internal" href="#system-emulator-cpus">System emulator CPUS</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#icelake-client-cpu-model-since-5-2"><code class="docutils literal notranslate"><span class="pre">Icelake-Client</span></code> CPU Model (since 5.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#mips-i7200-cpu-model-since-5-2">MIPS <code class="docutils literal notranslate"><span class="pre">I7200</span></code> CPU Model (since 5.2)</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="#qemu-api-qapi-events">QEMU API (QAPI) events</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#mem-unplug-error-since-6-2"><code class="docutils literal notranslate"><span class="pre">MEM_UNPLUG_ERROR</span></code> (since 6.2)</a></li>
</ul>
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<li class="toctree-l3"><a class="reference internal" href="#system-emulator-machines">System emulator machines</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#aspeed-swift-bmc-machine-since-6-1">Aspeed <code class="docutils literal notranslate"><span class="pre">swift-bmc</span></code> machine (since 6.1)</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#backend-options">Backend options</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#using-non-persistent-backing-file-with-pmem-on-since-6-1">Using non-persistent backing file with pmem=on (since 6.1)</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#device-options">Device options</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#emulated-device-options">Emulated device options</a></li>
<li class="toctree-l4"><a class="reference internal" href="#block-device-options">Block device options</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#linux-user-mode-cpus">linux-user mode CPUs</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#ppc64abi32-cpus-since-5-2"><code class="docutils literal notranslate"><span class="pre">ppc64abi32</span></code> CPUs (since 5.2)</a></li>
<li class="toctree-l4"><a class="reference internal" href="#mips-i7200-cpu-since-5-2">MIPS <code class="docutils literal notranslate"><span class="pre">I7200</span></code> CPU (since 5.2)</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#backwards-compatibility">Backwards compatibility</a><ul>
<li class="toctree-l4"><a class="reference internal" href="#runnability-guarantee-of-cpu-models-since-4-1">Runnability guarantee of CPU models (since 4.1)</a></li>
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  <div class="section" id="deprecated-features">
<span id="id1"></span><h1>Deprecated features<a class="headerlink" href="#deprecated-features" title="Permalink to this headline">¶</a></h1>
<p>In general features are intended to be supported indefinitely once
introduced into QEMU. In the event that a feature needs to be removed,
it will be listed in this section. The feature will remain functional for the
release in which it was deprecated and one further release. After these two
releases, the feature is liable to be removed. Deprecated features may also
generate warnings on the console when QEMU starts up, or if activated via a
monitor command, however, this is not a mandatory requirement.</p>
<p>Prior to the 2.10.0 release there was no official policy on how
long features would be deprecated prior to their removal, nor
any documented list of which features were deprecated. Thus
any features deprecated prior to 2.10.0 will be treated as if
they were first deprecated in the 2.10.0 release.</p>
<p>What follows is a list of all features currently marked as
deprecated.</p>
<div class="section" id="system-emulator-command-line-arguments">
<h2>System emulator command line arguments<a class="headerlink" href="#system-emulator-command-line-arguments" title="Permalink to this headline">¶</a></h2>
<div class="section" id="qemu-audio-environment-variables-and-audio-help-since-4-0">
<h3><code class="docutils literal notranslate"><span class="pre">QEMU_AUDIO_</span></code> environment variables and <code class="docutils literal notranslate"><span class="pre">-audio-help</span></code> (since 4.0)<a class="headerlink" href="#qemu-audio-environment-variables-and-audio-help-since-4-0" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">-audiodev</span></code> argument is now the preferred way to specify audio
backend settings instead of environment variables.  To ease migration to
the new format, the <code class="docutils literal notranslate"><span class="pre">-audiodev-help</span></code> option can be used to convert
the current values of the environment variables to <code class="docutils literal notranslate"><span class="pre">-audiodev</span></code> options.</p>
</div>
<div class="section" id="creating-sound-card-devices-and-vnc-without-audiodev-property-since-4-2">
<h3>Creating sound card devices and vnc without <code class="docutils literal notranslate"><span class="pre">audiodev=</span></code> property (since 4.2)<a class="headerlink" href="#creating-sound-card-devices-and-vnc-without-audiodev-property-since-4-2" title="Permalink to this headline">¶</a></h3>
<p>When not using the deprecated legacy audio config, each sound card
should specify an <code class="docutils literal notranslate"><span class="pre">audiodev=</span></code> property.  Additionally, when using
vnc, you should specify an <code class="docutils literal notranslate"><span class="pre">audiodev=</span></code> property if you plan to
transmit audio through the VNC protocol.</p>
</div>
<div class="section" id="creating-sound-card-devices-using-soundhw-since-5-1">
<h3>Creating sound card devices using <code class="docutils literal notranslate"><span class="pre">-soundhw</span></code> (since 5.1)<a class="headerlink" href="#creating-sound-card-devices-using-soundhw-since-5-1" title="Permalink to this headline">¶</a></h3>
<p>Sound card devices should be created using <code class="docutils literal notranslate"><span class="pre">-device</span></code> instead.  The
names are the same for most devices.  The exceptions are <code class="docutils literal notranslate"><span class="pre">hda</span></code> which
needs two devices (<code class="docutils literal notranslate"><span class="pre">-device</span> <span class="pre">intel-hda</span> <span class="pre">-device</span> <span class="pre">hda-duplex</span></code>) and
<code class="docutils literal notranslate"><span class="pre">pcspk</span></code> which can be activated using <code class="docutils literal notranslate"><span class="pre">-machine</span>
<span class="pre">pcspk-audiodev=&lt;name&gt;</span></code>.</p>
</div>
<div class="section" id="chardev-backend-aliases-tty-and-parport-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">-chardev</span></code> backend aliases <code class="docutils literal notranslate"><span class="pre">tty</span></code> and <code class="docutils literal notranslate"><span class="pre">parport</span></code> (since 6.0)<a class="headerlink" href="#chardev-backend-aliases-tty-and-parport-since-6-0" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">tty</span></code> and <code class="docutils literal notranslate"><span class="pre">parport</span></code> are aliases that will be removed. Instead, the
actual backend names <code class="docutils literal notranslate"><span class="pre">serial</span></code> and <code class="docutils literal notranslate"><span class="pre">parallel</span></code> should be used.</p>
</div>
<div class="section" id="short-form-boolean-options-since-6-0">
<h3>Short-form boolean options (since 6.0)<a class="headerlink" href="#short-form-boolean-options-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>Boolean options such as <code class="docutils literal notranslate"><span class="pre">share=on</span></code>/<code class="docutils literal notranslate"><span class="pre">share=off</span></code> could be written
in short form as <code class="docutils literal notranslate"><span class="pre">share</span></code> and <code class="docutils literal notranslate"><span class="pre">noshare</span></code>.  This is now deprecated
and will cause a warning.</p>
</div>
<div class="section" id="delay-option-for-socket-character-devices-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">delay</span></code> option for socket character devices (since 6.0)<a class="headerlink" href="#delay-option-for-socket-character-devices-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>The replacement for the <code class="docutils literal notranslate"><span class="pre">nodelay</span></code> short-form boolean option is <code class="docutils literal notranslate"><span class="pre">nodelay=on</span></code>
rather than <code class="docutils literal notranslate"><span class="pre">delay=off</span></code>.</p>
</div>
<div class="section" id="enable-fips-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">--enable-fips</span></code> (since 6.0)<a class="headerlink" href="#enable-fips-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>This option restricts usage of certain cryptographic algorithms when
the host is operating in FIPS mode.</p>
<p>If FIPS compliance is required, QEMU should be built with the <code class="docutils literal notranslate"><span class="pre">libgcrypt</span></code>
library enabled as a cryptography provider.</p>
<p>Neither the <code class="docutils literal notranslate"><span class="pre">nettle</span></code> library, or the built-in cryptography provider are
supported on FIPS enabled hosts.</p>
</div>
<div class="section" id="writeconfig-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">-writeconfig</span></code> (since 6.0)<a class="headerlink" href="#writeconfig-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">-writeconfig</span></code> option is not able to serialize the entire contents
of the QEMU command line.  It is thus considered a failed experiment
and deprecated, with no current replacement.</p>
</div>
<div class="section" id="userspace-local-apic-with-kvm-x86-since-6-0">
<h3>Userspace local APIC with KVM (x86, since 6.0)<a class="headerlink" href="#userspace-local-apic-with-kvm-x86-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>Using <code class="docutils literal notranslate"><span class="pre">-M</span> <span class="pre">kernel-irqchip=off</span></code> with x86 machine types that include a local
APIC is deprecated.  The <code class="docutils literal notranslate"><span class="pre">split</span></code> setting is supported, as is using
<code class="docutils literal notranslate"><span class="pre">-M</span> <span class="pre">kernel-irqchip=off</span></code> with the ISA PC machine type.</p>
</div>
<div class="section" id="hexadecimal-sizes-with-scaling-multipliers-since-6-0">
<h3>hexadecimal sizes with scaling multipliers (since 6.0)<a class="headerlink" href="#hexadecimal-sizes-with-scaling-multipliers-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>Input parameters that take a size value should only use a size suffix
(such as ‘k’ or ‘M’) when the base is written in decimal, and not when
the value is hexadecimal.  That is, ‘0x20M’ is deprecated, and should
be written either as ‘32M’ or as ‘0x2000000’.</p>
</div>
<div class="section" id="spice-password-string-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">-spice</span> <span class="pre">password=string</span></code> (since 6.0)<a class="headerlink" href="#spice-password-string-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>This option is insecure because the SPICE password remains visible in
the process listing. This is replaced by the new <code class="docutils literal notranslate"><span class="pre">password-secret</span></code>
option which lets the password be securely provided on the command
line using a <code class="docutils literal notranslate"><span class="pre">secret</span></code> object instance.</p>
</div>
<div class="section" id="opened-property-of-rng-objects-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">opened</span></code> property of <code class="docutils literal notranslate"><span class="pre">rng-*</span></code> objects (since 6.0)<a class="headerlink" href="#opened-property-of-rng-objects-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>The only effect of specifying <code class="docutils literal notranslate"><span class="pre">opened=on</span></code> in the command line or QMP
<code class="docutils literal notranslate"><span class="pre">object-add</span></code> is that the device is opened immediately, possibly before all
other options have been processed.  This will either have no effect (if
<code class="docutils literal notranslate"><span class="pre">opened</span></code> was the last option) or cause errors.  The property is therefore
useless and should not be specified.</p>
</div>
<div class="section" id="loaded-property-of-secret-and-secret-keyring-objects-since-6-0">
<h3><code class="docutils literal notranslate"><span class="pre">loaded</span></code> property of <code class="docutils literal notranslate"><span class="pre">secret</span></code> and <code class="docutils literal notranslate"><span class="pre">secret_keyring</span></code> objects (since 6.0)<a class="headerlink" href="#loaded-property-of-secret-and-secret-keyring-objects-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>The only effect of specifying <code class="docutils literal notranslate"><span class="pre">loaded=on</span></code> in the command line or QMP
<code class="docutils literal notranslate"><span class="pre">object-add</span></code> is that the secret is loaded immediately, possibly before all
other options have been processed.  This will either have no effect (if
<code class="docutils literal notranslate"><span class="pre">loaded</span></code> was the last option) or cause options to be effectively ignored as
if they were not given.  The property is therefore useless and should not be
specified.</p>
</div>
<div class="section" id="display-sdl-window-close-since-6-1">
<h3><code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,window_close=...</span></code> (since 6.1)<a class="headerlink" href="#display-sdl-window-close-since-6-1" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,window-close=...</span></code> instead (i.e. with a minus instead of
an underscore between “window” and “close”).</p>
</div>
<div class="section" id="no-quit-since-6-1">
<h3><code class="docutils literal notranslate"><span class="pre">-no-quit</span></code> (since 6.1)<a class="headerlink" href="#no-quit-since-6-1" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">-no-quit</span></code> is a synonym for <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">...,window-close=off</span></code> which
should be used instead.</p>
</div>
<div class="section" id="alt-grab-and-display-sdl-alt-grab-on-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-alt-grab</span></code> and <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,alt_grab=on</span></code> (since 6.2)<a class="headerlink" href="#alt-grab-and-display-sdl-alt-grab-on-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,grab-mod=lshift-lctrl-lalt</span></code> instead.</p>
</div>
<div class="section" id="ctrl-grab-and-display-sdl-ctrl-grab-on-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-ctrl-grab</span></code> and <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,ctrl_grab=on</span></code> (since 6.2)<a class="headerlink" href="#ctrl-grab-and-display-sdl-ctrl-grab-on-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl,grab-mod=rctrl</span></code> instead.</p>
</div>
<div class="section" id="sdl-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-sdl</span></code> (since 6.2)<a class="headerlink" href="#sdl-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">sdl</span></code> instead.</p>
</div>
<div class="section" id="curses-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-curses</span></code> (since 6.2)<a class="headerlink" href="#curses-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">-display</span> <span class="pre">curses</span></code> instead.</p>
</div>
<div class="section" id="watchdog-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-watchdog</span></code> (since 6.2)<a class="headerlink" href="#watchdog-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">-device</span></code> instead.</p>
</div>
<div class="section" id="smp-parameter-0-smp-configurations-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-smp</span></code> (“parameter=0” SMP configurations) (since 6.2)<a class="headerlink" href="#smp-parameter-0-smp-configurations-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Specified CPU topology parameters must be greater than zero.</p>
<p>In the SMP configuration, users should either provide a CPU topology
parameter with a reasonable value (greater than zero) or just omit it
and QEMU will compute the missing value.</p>
<p>However, historically it was implicitly allowed for users to provide
a parameter with zero value, which is meaningless and could also possibly
cause unexpected results in the -smp parsing. So support for this kind of
configurations (e.g. -smp 8,sockets=0) is deprecated since 6.2 and will
be removed in the near future, users have to ensure that all the topology
members described with -smp are greater than zero.</p>
</div>
<div class="section" id="plugin-argument-passing-through-arg-string-since-6-1">
<h3>Plugin argument passing through <code class="docutils literal notranslate"><span class="pre">arg=&lt;string&gt;</span></code> (since 6.1)<a class="headerlink" href="#plugin-argument-passing-through-arg-string-since-6-1" title="Permalink to this headline">¶</a></h3>
<p>Passing TCG plugins arguments through <code class="docutils literal notranslate"><span class="pre">arg=</span></code> is redundant is makes the
command-line less readable, especially when the argument itself consist of a
name and a value, e.g. <code class="docutils literal notranslate"><span class="pre">-plugin</span> <span class="pre">plugin_name,arg=&quot;arg_name=arg_value&quot;</span></code>.
Therefore, the usage of <code class="docutils literal notranslate"><span class="pre">arg</span></code> is redundant. Single-word arguments are treated
as short-form boolean values, and passed to plugins as <code class="docutils literal notranslate"><span class="pre">arg_name=on</span></code>.
However, short-form booleans are deprecated and full explicit <code class="docutils literal notranslate"><span class="pre">arg_name=on</span></code>
form is preferred.</p>
</div>
<div class="section" id="drive-if-none-for-the-sifive-u-otp-device-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">-drive</span> <span class="pre">if=none</span></code> for the sifive_u OTP device (since 6.2)<a class="headerlink" href="#drive-if-none-for-the-sifive-u-otp-device-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Using <code class="docutils literal notranslate"><span class="pre">-drive</span> <span class="pre">if=none</span></code> to configure the OTP device of the sifive_u
RISC-V machine is deprecated. Use <code class="docutils literal notranslate"><span class="pre">-drive</span> <span class="pre">if=pflash</span></code> instead.</p>
</div>
</div>
<div class="section" id="qemu-machine-protocol-qmp-commands">
<h2>QEMU Machine Protocol (QMP) commands<a class="headerlink" href="#qemu-machine-protocol-qmp-commands" title="Permalink to this headline">¶</a></h2>
<div class="section" id="blockdev-open-tray-blockdev-close-tray-argument-device-since-2-8">
<h3><code class="docutils literal notranslate"><span class="pre">blockdev-open-tray</span></code>, <code class="docutils literal notranslate"><span class="pre">blockdev-close-tray</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)<a class="headerlink" href="#blockdev-open-tray-blockdev-close-tray-argument-device-since-2-8" title="Permalink to this headline">¶</a></h3>
<p>Use argument <code class="docutils literal notranslate"><span class="pre">id</span></code> instead.</p>
</div>
<div class="section" id="eject-argument-device-since-2-8">
<h3><code class="docutils literal notranslate"><span class="pre">eject</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)<a class="headerlink" href="#eject-argument-device-since-2-8" title="Permalink to this headline">¶</a></h3>
<p>Use argument <code class="docutils literal notranslate"><span class="pre">id</span></code> instead.</p>
</div>
<div class="section" id="blockdev-change-medium-argument-device-since-2-8">
<h3><code class="docutils literal notranslate"><span class="pre">blockdev-change-medium</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)<a class="headerlink" href="#blockdev-change-medium-argument-device-since-2-8" title="Permalink to this headline">¶</a></h3>
<p>Use argument <code class="docutils literal notranslate"><span class="pre">id</span></code> instead.</p>
</div>
<div class="section" id="block-set-io-throttle-argument-device-since-2-8">
<h3><code class="docutils literal notranslate"><span class="pre">block_set_io_throttle</span></code> argument <code class="docutils literal notranslate"><span class="pre">device</span></code> (since 2.8)<a class="headerlink" href="#block-set-io-throttle-argument-device-since-2-8" title="Permalink to this headline">¶</a></h3>
<p>Use argument <code class="docutils literal notranslate"><span class="pre">id</span></code> instead.</p>
</div>
<div class="section" id="blockdev-add-empty-string-argument-backing-since-2-10">
<h3><code class="docutils literal notranslate"><span class="pre">blockdev-add</span></code> empty string argument <code class="docutils literal notranslate"><span class="pre">backing</span></code> (since 2.10)<a class="headerlink" href="#blockdev-add-empty-string-argument-backing-since-2-10" title="Permalink to this headline">¶</a></h3>
<p>Use argument value <code class="docutils literal notranslate"><span class="pre">null</span></code> instead.</p>
</div>
<div class="section" id="block-commit-arguments-base-and-top-since-3-1">
<h3><code class="docutils literal notranslate"><span class="pre">block-commit</span></code> arguments <code class="docutils literal notranslate"><span class="pre">base</span></code> and <code class="docutils literal notranslate"><span class="pre">top</span></code> (since 3.1)<a class="headerlink" href="#block-commit-arguments-base-and-top-since-3-1" title="Permalink to this headline">¶</a></h3>
<p>Use arguments <code class="docutils literal notranslate"><span class="pre">base-node</span></code> and <code class="docutils literal notranslate"><span class="pre">top-node</span></code> instead.</p>
</div>
<div class="section" id="nbd-server-add-and-nbd-server-remove-since-5-2">
<h3><code class="docutils literal notranslate"><span class="pre">nbd-server-add</span></code> and <code class="docutils literal notranslate"><span class="pre">nbd-server-remove</span></code> (since 5.2)<a class="headerlink" href="#nbd-server-add-and-nbd-server-remove-since-5-2" title="Permalink to this headline">¶</a></h3>
<p>Use the more generic commands <code class="docutils literal notranslate"><span class="pre">block-export-add</span></code> and <code class="docutils literal notranslate"><span class="pre">block-export-del</span></code>
instead.  As part of this deprecation, where <code class="docutils literal notranslate"><span class="pre">nbd-server-add</span></code> used a
single <code class="docutils literal notranslate"><span class="pre">bitmap</span></code>, the new <code class="docutils literal notranslate"><span class="pre">block-export-add</span></code> uses a list of <code class="docutils literal notranslate"><span class="pre">bitmaps</span></code>.</p>
</div>
<div class="section" id="query-qmp-schema-return-value-member-values-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">query-qmp-schema</span></code> return value member <code class="docutils literal notranslate"><span class="pre">values</span></code> (since 6.2)<a class="headerlink" href="#query-qmp-schema-return-value-member-values-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Member <code class="docutils literal notranslate"><span class="pre">values</span></code> in return value elements with meta-type <code class="docutils literal notranslate"><span class="pre">enum</span></code> is
deprecated.  Use <code class="docutils literal notranslate"><span class="pre">members</span></code> instead.</p>
</div>
<div class="section" id="drive-backup-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">drive-backup</span></code> (since 6.2)<a class="headerlink" href="#drive-backup-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use <code class="docutils literal notranslate"><span class="pre">blockdev-backup</span></code> in combination with <code class="docutils literal notranslate"><span class="pre">blockdev-add</span></code> instead.
This change primarily separates the creation/opening process of the backup
target with explicit, separate steps. <code class="docutils literal notranslate"><span class="pre">blockdev-backup</span></code> uses mostly the
same arguments as <code class="docutils literal notranslate"><span class="pre">drive-backup</span></code>, except the <code class="docutils literal notranslate"><span class="pre">format</span></code> and <code class="docutils literal notranslate"><span class="pre">mode</span></code>
options are removed in favor of using explicit <code class="docutils literal notranslate"><span class="pre">blockdev-create</span></code> and
<code class="docutils literal notranslate"><span class="pre">blockdev-add</span></code> calls. See <a class="reference internal" href="../interop/live-block-operations.html"><span class="doc">Live Block Device Operations</span></a> for
details.</p>
</div>
<div class="section" id="incorrectly-typed-device-add-arguments-since-6-2">
<h3>Incorrectly typed <code class="docutils literal notranslate"><span class="pre">device_add</span></code> arguments (since 6.2)<a class="headerlink" href="#incorrectly-typed-device-add-arguments-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Due to shortcomings in the internal implementation of <code class="docutils literal notranslate"><span class="pre">device_add</span></code>, QEMU
incorrectly accepts certain invalid arguments: Any object or list arguments are
silently ignored. Other argument types are not checked, but an implicit
conversion happens, so that e.g. string values can be assigned to integer
device properties or vice versa.</p>
<p>This is a bug in QEMU that will be fixed in the future so that previously
accepted incorrect commands will return an error. Users should make sure that
all arguments passed to <code class="docutils literal notranslate"><span class="pre">device_add</span></code> are consistent with the documented
property types.</p>
</div>
<div class="section" id="query-sgx-return-value-member-section-size-since-7-0">
<h3><code class="docutils literal notranslate"><span class="pre">query-sgx</span></code> return value member <code class="docutils literal notranslate"><span class="pre">section-size</span></code> (since 7.0)<a class="headerlink" href="#query-sgx-return-value-member-section-size-since-7-0" title="Permalink to this headline">¶</a></h3>
<p>Member <code class="docutils literal notranslate"><span class="pre">section-size</span></code> in return value elements with meta-type <code class="docutils literal notranslate"><span class="pre">uint64</span></code> is
deprecated.  Use <code class="docutils literal notranslate"><span class="pre">sections</span></code> instead.</p>
</div>
<div class="section" id="query-sgx-capabilities-return-value-member-section-size-since-7-0">
<h3><code class="docutils literal notranslate"><span class="pre">query-sgx-capabilities</span></code> return value member <code class="docutils literal notranslate"><span class="pre">section-size</span></code> (since 7.0)<a class="headerlink" href="#query-sgx-capabilities-return-value-member-section-size-since-7-0" title="Permalink to this headline">¶</a></h3>
<p>Member <code class="docutils literal notranslate"><span class="pre">section-size</span></code> in return value elements with meta-type <code class="docutils literal notranslate"><span class="pre">uint64</span></code> is
deprecated.  Use <code class="docutils literal notranslate"><span class="pre">sections</span></code> instead.</p>
</div>
</div>
<div class="section" id="system-accelerators">
<h2>System accelerators<a class="headerlink" href="#system-accelerators" title="Permalink to this headline">¶</a></h2>
<div class="section" id="mips-trap-and-emul-kvm-support-since-6-0">
<h3>MIPS <code class="docutils literal notranslate"><span class="pre">Trap-and-Emul</span></code> KVM support (since 6.0)<a class="headerlink" href="#mips-trap-and-emul-kvm-support-since-6-0" title="Permalink to this headline">¶</a></h3>
<p>The MIPS <code class="docutils literal notranslate"><span class="pre">Trap-and-Emul</span></code> KVM host and guest support has been removed
from Linux upstream kernel, declare it deprecated.</p>
</div>
</div>
<div class="section" id="system-emulator-cpus">
<h2>System emulator CPUS<a class="headerlink" href="#system-emulator-cpus" title="Permalink to this headline">¶</a></h2>
<div class="section" id="icelake-client-cpu-model-since-5-2">
<h3><code class="docutils literal notranslate"><span class="pre">Icelake-Client</span></code> CPU Model (since 5.2)<a class="headerlink" href="#icelake-client-cpu-model-since-5-2" title="Permalink to this headline">¶</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">Icelake-Client</span></code> CPU Models are deprecated. Use <code class="docutils literal notranslate"><span class="pre">Icelake-Server</span></code> CPU
Models instead.</p>
</div>
<div class="section" id="mips-i7200-cpu-model-since-5-2">
<h3>MIPS <code class="docutils literal notranslate"><span class="pre">I7200</span></code> CPU Model (since 5.2)<a class="headerlink" href="#mips-i7200-cpu-model-since-5-2" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">I7200</span></code> guest CPU relies on the nanoMIPS ISA, which is deprecated
(the ISA has never been upstreamed to a compiler toolchain). Therefore
this CPU is also deprecated.</p>
</div>
</div>
<div class="section" id="qemu-api-qapi-events">
<h2>QEMU API (QAPI) events<a class="headerlink" href="#qemu-api-qapi-events" title="Permalink to this headline">¶</a></h2>
<div class="section" id="mem-unplug-error-since-6-2">
<h3><code class="docutils literal notranslate"><span class="pre">MEM_UNPLUG_ERROR</span></code> (since 6.2)<a class="headerlink" href="#mem-unplug-error-since-6-2" title="Permalink to this headline">¶</a></h3>
<p>Use the more generic event <code class="docutils literal notranslate"><span class="pre">DEVICE_UNPLUG_GUEST_ERROR</span></code> instead.</p>
</div>
</div>
<div class="section" id="system-emulator-machines">
<h2>System emulator machines<a class="headerlink" href="#system-emulator-machines" title="Permalink to this headline">¶</a></h2>
<div class="section" id="aspeed-swift-bmc-machine-since-6-1">
<h3>Aspeed <code class="docutils literal notranslate"><span class="pre">swift-bmc</span></code> machine (since 6.1)<a class="headerlink" href="#aspeed-swift-bmc-machine-since-6-1" title="Permalink to this headline">¶</a></h3>
<p>This machine is deprecated because we have enough AST2500 based OpenPOWER
machines. It can be easily replaced by the <code class="docutils literal notranslate"><span class="pre">witherspoon-bmc</span></code> or the
<code class="docutils literal notranslate"><span class="pre">romulus-bmc</span></code> machines.</p>
</div>
</div>
<div class="section" id="backend-options">
<h2>Backend options<a class="headerlink" href="#backend-options" title="Permalink to this headline">¶</a></h2>
<div class="section" id="using-non-persistent-backing-file-with-pmem-on-since-6-1">
<h3>Using non-persistent backing file with pmem=on (since 6.1)<a class="headerlink" href="#using-non-persistent-backing-file-with-pmem-on-since-6-1" title="Permalink to this headline">¶</a></h3>
<p>This option is used when <code class="docutils literal notranslate"><span class="pre">memory-backend-file</span></code> is consumed by emulated NVDIMM
device. However enabling <code class="docutils literal notranslate"><span class="pre">memory-backend-file.pmem</span></code> option, when backing file
is (a) not DAX capable or (b) not on a filesystem that support direct mapping
of persistent memory, is not safe and may lead to data loss or corruption in case
of host crash.
Options are:</p>
<blockquote>
<div><ul class="simple">
<li>modify VM configuration to set <code class="docutils literal notranslate"><span class="pre">pmem=off</span></code> to continue using fake NVDIMM
(without persistence guaranties) with backing file on non DAX storage</li>
<li>move backing file to NVDIMM storage and keep <code class="docutils literal notranslate"><span class="pre">pmem=on</span></code>
(to have NVDIMM with persistence guaranties).</li>
</ul>
</div></blockquote>
</div>
</div>
<div class="section" id="device-options">
<h2>Device options<a class="headerlink" href="#device-options" title="Permalink to this headline">¶</a></h2>
<div class="section" id="emulated-device-options">
<h3>Emulated device options<a class="headerlink" href="#emulated-device-options" title="Permalink to this headline">¶</a></h3>
<div class="section" id="device-virtio-blk-scsi-on-off-since-5-0">
<h4><code class="docutils literal notranslate"><span class="pre">-device</span> <span class="pre">virtio-blk,scsi=on|off</span></code> (since 5.0)<a class="headerlink" href="#device-virtio-blk-scsi-on-off-since-5-0" title="Permalink to this headline">¶</a></h4>
<p>The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature.  VIRTIO 1.0
and later do not support it because the virtio-scsi device was introduced for
full SCSI support.  Use virtio-scsi instead when SCSI passthrough is required.</p>
<p>Note this also applies to <code class="docutils literal notranslate"><span class="pre">-device</span> <span class="pre">virtio-blk-pci,scsi=on|off</span></code>, which is an
alias.</p>
</div>
<div class="section" id="device-sga-since-6-2">
<h4><code class="docutils literal notranslate"><span class="pre">-device</span> <span class="pre">sga</span></code> (since 6.2)<a class="headerlink" href="#device-sga-since-6-2" title="Permalink to this headline">¶</a></h4>
<p>The <code class="docutils literal notranslate"><span class="pre">sga</span></code> device loads an option ROM for x86 targets which enables
SeaBIOS to send messages to the serial console. SeaBIOS 1.11.0 onwards
contains native support for this feature and thus use of the option
ROM approach is obsolete. The native SeaBIOS support can be activated
by using <code class="docutils literal notranslate"><span class="pre">-machine</span> <span class="pre">graphics=off</span></code>.</p>
</div>
</div>
<div class="section" id="block-device-options">
<h3>Block device options<a class="headerlink" href="#block-device-options" title="Permalink to this headline">¶</a></h3>
<div class="section" id="backing-since-2-12">
<h4><code class="docutils literal notranslate"><span class="pre">&quot;backing&quot;:</span> <span class="pre">&quot;&quot;</span></code> (since 2.12)<a class="headerlink" href="#backing-since-2-12" title="Permalink to this headline">¶</a></h4>
<p>In order to prevent QEMU from automatically opening an image’s backing
chain, use <code class="docutils literal notranslate"><span class="pre">&quot;backing&quot;:</span> <span class="pre">null</span></code> instead.</p>
</div>
<div class="section" id="rbd-keyvalue-pair-encoded-filenames-since-3-1">
<h4><code class="docutils literal notranslate"><span class="pre">rbd</span></code> keyvalue pair encoded filenames: <code class="docutils literal notranslate"><span class="pre">&quot;&quot;</span></code> (since 3.1)<a class="headerlink" href="#rbd-keyvalue-pair-encoded-filenames-since-3-1" title="Permalink to this headline">¶</a></h4>
<p>Options for <code class="docutils literal notranslate"><span class="pre">rbd</span></code> should be specified according to its runtime options,
like other block drivers.  Legacy parsing of keyvalue pair encoded
filenames is useful to open images with the old format for backing files;
These image files should be updated to use the current format.</p>
<p>Example of legacy encoding:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">json</span><span class="p">:{</span><span class="s2">&quot;file.driver&quot;</span><span class="p">:</span><span class="s2">&quot;rbd&quot;</span><span class="p">,</span> <span class="s2">&quot;file.filename&quot;</span><span class="p">:</span><span class="s2">&quot;rbd:rbd/name&quot;</span><span class="p">}</span>
</pre></div>
</div>
<p>The above, converted to the current supported format:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">json</span><span class="p">:{</span><span class="s2">&quot;file.driver&quot;</span><span class="p">:</span><span class="s2">&quot;rbd&quot;</span><span class="p">,</span> <span class="s2">&quot;file.pool&quot;</span><span class="p">:</span><span class="s2">&quot;rbd&quot;</span><span class="p">,</span> <span class="s2">&quot;file.image&quot;</span><span class="p">:</span><span class="s2">&quot;name&quot;</span><span class="p">}</span>
</pre></div>
</div>
</div>
</div>
</div>
<div class="section" id="linux-user-mode-cpus">
<h2>linux-user mode CPUs<a class="headerlink" href="#linux-user-mode-cpus" title="Permalink to this headline">¶</a></h2>
<div class="section" id="ppc64abi32-cpus-since-5-2">
<h3><code class="docutils literal notranslate"><span class="pre">ppc64abi32</span></code> CPUs (since 5.2)<a class="headerlink" href="#ppc64abi32-cpus-since-5-2" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">ppc64abi32</span></code> architecture has a number of issues which regularly
trip up our CI testing and is suspected to be quite broken. For that
reason the maintainers strongly suspect no one actually uses it.</p>
</div>
<div class="section" id="mips-i7200-cpu-since-5-2">
<h3>MIPS <code class="docutils literal notranslate"><span class="pre">I7200</span></code> CPU (since 5.2)<a class="headerlink" href="#mips-i7200-cpu-since-5-2" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">I7200</span></code> guest CPU relies on the nanoMIPS ISA, which is deprecated
(the ISA has never been upstreamed to a compiler toolchain). Therefore
this CPU is also deprecated.</p>
</div>
</div>
<div class="section" id="backwards-compatibility">
<h2>Backwards compatibility<a class="headerlink" href="#backwards-compatibility" title="Permalink to this headline">¶</a></h2>
<div class="section" id="runnability-guarantee-of-cpu-models-since-4-1">
<h3>Runnability guarantee of CPU models (since 4.1)<a class="headerlink" href="#runnability-guarantee-of-cpu-models-since-4-1" title="Permalink to this headline">¶</a></h3>
<p>Previous versions of QEMU never changed existing CPU models in
ways that introduced additional host software or hardware
requirements to the VM.  This allowed management software to
safely change the machine type of an existing VM without
introducing new requirements (“runnability guarantee”).  This
prevented CPU models from being updated to include CPU
vulnerability mitigations, leaving guests vulnerable in the
default configuration.</p>
<p>The CPU model runnability guarantee won’t apply anymore to
existing CPU models.  Management software that needs runnability
guarantees must resolve the CPU model aliases using the
<code class="docutils literal notranslate"><span class="pre">alias-of</span></code> field returned by the <code class="docutils literal notranslate"><span class="pre">query-cpu-definitions</span></code> QMP
command.</p>
<p>While those guarantees are kept, the return value of
<code class="docutils literal notranslate"><span class="pre">query-cpu-definitions</span></code> will have existing CPU model aliases
point to a version that doesn’t break runnability guarantees
(specifically, version 1 of those CPU models).  In future QEMU
versions, aliases will point to newer CPU model versions
depending on the machine type, so management software must
resolve CPU model aliases before starting a virtual machine.</p>
</div>
</div>
<div class="section" id="guest-emulator-isas">
<h2>Guest Emulator ISAs<a class="headerlink" href="#guest-emulator-isas" title="Permalink to this headline">¶</a></h2>
<div class="section" id="nanomips-isa">
<h3>nanoMIPS ISA<a class="headerlink" href="#nanomips-isa" title="Permalink to this headline">¶</a></h3>
<p>The <code class="docutils literal notranslate"><span class="pre">nanoMIPS</span></code> ISA has never been upstreamed to any compiler toolchain.
As it is hard to generate binaries for it, declare it deprecated.</p>
</div>
</div>
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