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<section id="subchannel-passthrough-via-vfio-ccw">
<h1>Subchannel passthrough via vfio-ccw<a class="headerlink" href="#subchannel-passthrough-via-vfio-ccw" title="Link to this heading"></a></h1>
<p>vfio-ccw (based upon the mediated vfio device infrastructure) allows to
make certain I/O subchannels and their devices available to a guest. The
host will not interact with those subchannels/devices any more.</p>
<p>Note that while vfio-ccw should work with most non-QDIO devices, only ECKD
DASDs have really been tested.</p>
<section id="example-configuration">
<h2>Example configuration<a class="headerlink" href="#example-configuration" title="Link to this heading"></a></h2>
<section id="step-1-configure-the-host-device">
<h3>Step 1: configure the host device<a class="headerlink" href="#step-1-configure-the-host-device" title="Link to this heading"></a></h3>
<p>As every mdev is identified by a uuid, the first step is to obtain one:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># uuidgen</span>
<span class="mf">7e270</span><span class="n">a25</span><span class="o">-</span><span class="n">e163</span><span class="o">-</span><span class="mi">4922</span><span class="o">-</span><span class="n">af60</span><span class="o">-</span><span class="mi">757</span><span class="n">fc8ed48c6</span>
</pre></div>
</div>
<p>Note: it is recommended to use the <code class="docutils literal notranslate"><span class="pre">mdevctl</span></code> tool for actually configuring
the host device.</p>
<p>To define the same device as configured below to be started
automatically, use</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># driverctl -b css set-override 0.0.0313 vfio_ccw</span>
<span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># mdevctl define -u 7e270a25-e163-4922-af60-757fc8ed48c6 \</span>
<span class="o">-</span><span class="n">p</span> <span class="mf">0.0.0313</span> <span class="o">-</span><span class="n">t</span> <span class="n">vfio_ccw</span><span class="o">-</span><span class="n">io</span> <span class="o">-</span><span class="n">a</span>
</pre></div>
</div>
<p>If using <code class="docutils literal notranslate"><span class="pre">mdevctl</span></code> is not possible or wanted, follow the manual procedure
below.</p>
<ul>
<li><p>Locate the subchannel for the device (in this example, <code class="docutils literal notranslate"><span class="pre">0.0.2b09</span></code>):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># lscss | grep 0.0.2b09 | awk &#39;{print $2}&#39;</span>
<span class="mf">0.0.0313</span>
</pre></div>
</div>
</li>
<li><p>Unbind the subchannel (in this example, <code class="docutils literal notranslate"><span class="pre">0.0.0313</span></code>) from the standard
I/O subchannel driver and bind it to the vfio-ccw driver:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># echo 0.0.0313 &gt; /sys/bus/css/devices/0.0.0313/driver/unbind</span>
<span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># echo 0.0.0313 &gt; /sys/bus/css/drivers/vfio_ccw/bind</span>
</pre></div>
</div>
</li>
<li><p>Create the mediated device (identified by the uuid):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">root</span><span class="nd">@host</span> <span class="o">~</span><span class="p">]</span><span class="c1"># echo &quot;7e270a25-e163-4922-af60-757fc8ed48c6&quot; &gt; \</span>
<span class="o">/</span><span class="n">sys</span><span class="o">/</span><span class="n">bus</span><span class="o">/</span><span class="n">css</span><span class="o">/</span><span class="n">devices</span><span class="o">/</span><span class="mf">0.0.0313</span><span class="o">/</span><span class="n">mdev_supported_types</span><span class="o">/</span><span class="n">vfio_ccw</span><span class="o">-</span><span class="n">io</span><span class="o">/</span><span class="n">create</span>
</pre></div>
</div>
</li>
</ul>
</section>
<section id="step-2-configure-qemu">
<h3>Step 2: configure QEMU<a class="headerlink" href="#step-2-configure-qemu" title="Link to this heading"></a></h3>
<ul>
<li><p>Reference the created mediated device and (optionally) pick a device id to
be presented in the guest (here, <code class="docutils literal notranslate"><span class="pre">fe.0.1234</span></code>, which will end up visible
in the guest as <code class="docutils literal notranslate"><span class="pre">0.0.1234</span></code>:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">device</span> <span class="n">vfio</span><span class="o">-</span><span class="n">ccw</span><span class="p">,</span><span class="n">devno</span><span class="o">=</span><span class="n">fe</span><span class="mf">.0.1234</span><span class="p">,</span><span class="n">sysfsdev</span><span class="o">=</span>\
<span class="o">/</span><span class="n">sys</span><span class="o">/</span><span class="n">bus</span><span class="o">/</span><span class="n">mdev</span><span class="o">/</span><span class="n">devices</span><span class="o">/</span><span class="mf">7e270</span><span class="n">a25</span><span class="o">-</span><span class="n">e163</span><span class="o">-</span><span class="mi">4922</span><span class="o">-</span><span class="n">af60</span><span class="o">-</span><span class="mi">757</span><span class="n">fc8ed48c6</span>
</pre></div>
</div>
</li>
<li><p>Start the guest. The device (here, <code class="docutils literal notranslate"><span class="pre">0.0.1234</span></code>) should now be usable:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">root</span><span class="nd">@guest</span> <span class="o">~</span><span class="p">]</span><span class="c1"># lscss -d 0.0.1234</span>
<span class="n">Device</span> <span class="n">Subchan</span><span class="o">.</span> <span class="n">DevType</span> <span class="n">CU</span> <span class="n">Type</span> <span class="n">Use</span> <span class="n">PIM</span> <span class="n">PAM</span> <span class="n">POM</span> <span class="n">CHPID</span>
<span class="o">----------------------------------------------------------------------</span>
<span class="mf">0.0.1234</span> <span class="mf">0.0.0007</span> <span class="mi">3390</span><span class="o">/</span><span class="mi">0</span><span class="n">e</span> <span class="mi">3990</span><span class="o">/</span><span class="n">e9</span> <span class="n">f0</span> <span class="n">f0</span> <span class="n">ff</span> <span class="mi">1</span><span class="n">a2a3a0a</span> <span class="mi">00000000</span>
<span class="p">[</span><span class="n">root</span><span class="nd">@guest</span> <span class="o">~</span><span class="p">]</span><span class="c1"># chccwdev -e 0.0.1234</span>
<span class="n">Setting</span> <span class="n">device</span> <span class="mf">0.0.1234</span> <span class="n">online</span>
<span class="n">Done</span>
<span class="p">[</span><span class="n">root</span><span class="nd">@guest</span> <span class="o">~</span><span class="p">]</span><span class="c1"># dmesg -t</span>
<span class="p">(</span><span class="o">...</span><span class="p">)</span>
<span class="n">dasd</span><span class="o">-</span><span class="n">eckd</span> <span class="mf">0.0.1234</span><span class="p">:</span> <span class="n">A</span> <span class="n">channel</span> <span class="n">path</span> <span class="n">to</span> <span class="n">the</span> <span class="n">device</span> <span class="n">has</span> <span class="n">become</span> <span class="n">operational</span>
<span class="n">dasd</span><span class="o">-</span><span class="n">eckd</span> <span class="mf">0.0.1234</span><span class="p">:</span> <span class="n">New</span> <span class="n">DASD</span> <span class="mi">3390</span><span class="o">/</span><span class="mi">0</span><span class="n">E</span> <span class="p">(</span><span class="n">CU</span> <span class="mi">3990</span><span class="o">/</span><span class="mi">01</span><span class="p">)</span> <span class="k">with</span> <span class="mi">10017</span> <span class="n">cylinders</span><span class="p">,</span> <span class="mi">15</span> <span class="n">heads</span><span class="p">,</span> <span class="mi">224</span> <span class="n">sectors</span>
<span class="n">dasd</span><span class="o">-</span><span class="n">eckd</span> <span class="mf">0.0.1234</span><span class="p">:</span> <span class="n">DASD</span> <span class="k">with</span> <span class="mi">4</span> <span class="n">KB</span><span class="o">/</span><span class="n">block</span><span class="p">,</span> <span class="mi">7212240</span> <span class="n">KB</span> <span class="n">total</span> <span class="n">size</span><span class="p">,</span> <span class="mi">48</span> <span class="n">KB</span><span class="o">/</span><span class="n">track</span><span class="p">,</span> <span class="n">compatible</span> <span class="n">disk</span> <span class="n">layout</span>
<span class="n">dasda</span><span class="p">:</span><span class="n">VOL1</span><span class="o">/</span> <span class="mh">0X2B09</span><span class="p">:</span> <span class="n">dasda1</span>
</pre></div>
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