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<section id="pci-devices-on-s390x">
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<h1>PCI devices on s390x<a class="headerlink" href="#pci-devices-on-s390x" title="Link to this heading"></a></h1>
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<p>PCI devices on s390x work differently than on other architectures and need to
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be configured in a slightly different way.</p>
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<p>Every PCI device is linked with an additional <code class="docutils literal notranslate"><span class="pre">zpci</span></code> device.
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While the <code class="docutils literal notranslate"><span class="pre">zpci</span></code> device will be autogenerated if not specified, it is
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recommended to specify it explicitly so that you can pass s390-specific
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PCI configuration.</p>
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<p>For example, in order to pass a PCI device <code class="docutils literal notranslate"><span class="pre">0000:00:00.0</span></code> through to the
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guest, you would specify:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">s390x</span> <span class="o">...</span> \
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<span class="o">-</span><span class="n">device</span> <span class="n">zpci</span><span class="p">,</span><span class="n">uid</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span><span class="n">fid</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span><span class="n">target</span><span class="o">=</span><span class="n">hostdev0</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">zpci1</span> \
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<span class="o">-</span><span class="n">device</span> <span class="n">vfio</span><span class="o">-</span><span class="n">pci</span><span class="p">,</span><span class="n">host</span><span class="o">=</span><span class="mi">0000</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mf">00.0</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">hostdev0</span>
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</pre></div>
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</div>
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<p>Here, the zpci device is joined with the PCI device via the <code class="docutils literal notranslate"><span class="pre">target</span></code> property.</p>
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<p>Note that we don’t set bus, slot or function here for the guest as is common in
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other PCI implementations. Topology information is not available on s390x, and
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the guest will not see any of the bus, slot or function information specified
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on the command line.</p>
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<p>Instead, <code class="docutils literal notranslate"><span class="pre">uid</span></code> and <code class="docutils literal notranslate"><span class="pre">fid</span></code> determine how the device is presented to the guest
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operating system.</p>
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<p>In case of Linux, <code class="docutils literal notranslate"><span class="pre">uid</span></code> will be used in the <code class="docutils literal notranslate"><span class="pre">domain</span></code> part of the PCI
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identifier, and <code class="docutils literal notranslate"><span class="pre">fid</span></code> identifies the physical slot, i.e.:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span><span class="o">-</span><span class="n">system</span><span class="o">-</span><span class="n">s390x</span> <span class="o">...</span> \
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<span class="o">-</span><span class="n">device</span> <span class="n">zpci</span><span class="p">,</span><span class="n">uid</span><span class="o">=</span><span class="mi">7</span><span class="p">,</span><span class="n">fid</span><span class="o">=</span><span class="mi">8</span><span class="p">,</span><span class="n">target</span><span class="o">=</span><span class="n">hostdev0</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">zpci1</span> \
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<span class="o">...</span>
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</pre></div>
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</div>
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<p>will be presented in the guest as:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># lspci -v</span>
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<span class="mi">0007</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mf">00.0</span> <span class="o">...</span>
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<span class="n">Physical</span> <span class="n">Slot</span><span class="p">:</span> <span class="mi">00000008</span>
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<span class="o">...</span>
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</pre></div>
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