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<section id="s390x-system-emulator">
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<span id="id1"></span><h1>s390x System emulator<a class="headerlink" href="#s390x-system-emulator" title="Link to this heading"></a></h1>
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<p>QEMU can emulate z/Architecture (in particular, 64 bit) s390x systems
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via the <code class="docutils literal notranslate"><span class="pre">qemu-system-s390x</span></code> binary. Only one machine type,
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<code class="docutils literal notranslate"><span class="pre">s390-ccw-virtio</span></code>, is supported (with versioning for compatibility
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handling).</p>
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<p>When using KVM as accelerator, QEMU can emulate CPUs up to the generation
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of the host. When using the default cpu model with TCG as accelerator,
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QEMU will emulate a subset of z13 cpu features that should be enough to run
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distributions built for the z13.</p>
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<section id="device-support">
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<h2>Device support<a class="headerlink" href="#device-support" title="Link to this heading"></a></h2>
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<p>QEMU will not emulate most of the traditional devices found under LPAR or
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z/VM; virtio devices (especially using virtio-ccw) make up the bulk of
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the available devices. Passthrough of host devices via vfio-pci, vfio-ccw,
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or vfio-ap is also available.</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="s390x/vfio-ap.html">Adjunct Processor (AP) Device</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ap.html#introduction">Introduction</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ap.html#ap-architectural-overview">AP Architectural Overview</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ap.html#start-interpretive-execution-sie-instruction">Start Interpretive Execution (SIE) Instruction</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#example-1-valid-configuration">Example 1: Valid configuration</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#example-2-valid-configuration">Example 2: Valid configuration</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#example-3-invalid-configuration">Example 3: Invalid configuration</a></li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ap.html#ap-matrix-configuration-on-linux-host">AP Matrix Configuration on Linux Host</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#binding-ap-devices-to-device-drivers">Binding AP devices to device drivers</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#configuring-an-ap-matrix-for-a-linux-guest">Configuring an AP matrix for a linux guest</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#starting-a-linux-guest-configured-with-an-ap-matrix">Starting a Linux Guest Configured with an AP Matrix</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#hot-plug-a-vfio-ap-device-into-a-running-guest">Hot plug a vfio-ap device into a running guest</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ap.html#hot-unplug-a-vfio-ap-device-from-a-running-guest">Hot unplug a vfio-ap device from a running guest</a></li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ap.html#example-configure-ap-matrices-for-three-linux-guests">Example: Configure AP Matrices for Three Linux Guests</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ap.html#limitations">Limitations</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="s390x/css.html">The virtual channel subsystem</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/css.html#examples">Examples</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="s390x/3270.html">3270 devices</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/3270.html#example-configuration">Example configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/3270.html#restrictions">Restrictions</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="s390x/vfio-ccw.html">Subchannel passthrough via vfio-ccw</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/vfio-ccw.html#example-configuration">Example configuration</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ccw.html#step-1-configure-the-host-device">Step 1: configure the host device</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/vfio-ccw.html#step-2-configure-qemu">Step 2: configure QEMU</a></li>
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</ul>
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</li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="s390x/pcidevices.html">PCI devices on s390x</a></li>
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</ul>
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</div>
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</section>
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<section id="architectural-features">
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<h2>Architectural features<a class="headerlink" href="#architectural-features" title="Link to this heading"></a></h2>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="s390x/bootdevices.html">Boot devices on s390x</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/bootdevices.html#booting-with-bootindex-parameter">Booting with bootindex parameter</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/bootdevices.html#booting-without-bootindex-parameter">Booting without bootindex parameter</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/bootdevices.html#selecting-kernels-with-the-loadparm-property">Selecting kernels with the <code class="docutils literal notranslate"><span class="pre">loadparm</span></code> property</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/bootdevices.html#booting-from-a-network-device">Booting from a network device</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="s390x/protvirt.html">Protected Virtualization on s390x</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/protvirt.html#prerequisites">Prerequisites</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/protvirt.html#running-a-protected-virtual-machine">Running a Protected Virtual Machine</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/protvirt.html#boot-process">Boot Process</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference internal" href="s390x/cpu-topology.html">CPU topology on s390x</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="s390x/cpu-topology.html#prerequisites">Prerequisites</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/cpu-topology.html#enabling-cpu-topology">Enabling CPU topology</a></li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/cpu-topology.html#default-topology-usage">Default topology usage</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="s390x/cpu-topology.html#hot-plug">Hot plug</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/cpu-topology.html#examples">Examples</a></li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/cpu-topology.html#polarization-entitlement-and-dedication">Polarization, entitlement and dedication</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="s390x/cpu-topology.html#polarization">Polarization</a></li>
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<li class="toctree-l3"><a class="reference internal" href="s390x/cpu-topology.html#entitlement">Entitlement</a></li>
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</ul>
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</li>
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<li class="toctree-l2"><a class="reference internal" href="s390x/cpu-topology.html#defining-the-topology-on-the-command-line">Defining the topology on the command line</a></li>
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</ul>
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