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+<table class="head">
+ <tr>
+ <td class="head-ltitle">VIRTIO_SCSI(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">VIRTIO_SCSI(4)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">virtio_scsi</code> &#x2014;
+ <span class="Nd">VirtIO SCSI driver</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following lines
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device virtio_scsi</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+ the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>virtio_scsi_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">virtio_scsi</code> device driver provides
+ support for VirtIO SCSI devices.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+ TUNABLES</a></h1>
+<p class="Pp">Tunables can be set at the <a class="Xr">loader(8)</a> prompt
+ before booting the kernel or stored in <a class="Xr">loader.conf(5)</a>.</p>
+<dl class="Bl-tag">
+ <dt id="hw.vtscsi.bus_reset_disable"><var class="Va">hw.vtscsi.bus_reset_disable</var></dt>
+ <dd>In the initial QEMU release with VirtIO SCSI support, in-flight operations
+ were not aborted when stopping the device, rendering bus reset
+ ineffective. This tunable disables attempts to issue reset bus commands.
+ The default value is 1.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DEBUGGING"><a class="permalink" href="#DEBUGGING">DEBUGGING</a></h1>
+<p class="Pp">To enable debugging prints from the
+ <code class="Nm">virtio_scsi</code> driver, set the</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>hw.vtscsi.X.debug_level</pre>
+</div>
+<p class="Pp">variable, where X is the adapter number, either in
+ <a class="Xr">loader.conf(5)</a> or via <a class="Xr">sysctl(8)</a>. The
+ following bits have the described effects:</p>
+<div class="Bd-indent">
+<dl class="Bl-tag">
+ <dt>0x01</dt>
+ <dd>Enable informational prints.</dd>
+ <dt>0x02</dt>
+ <dd>Enable prints for driver errors.</dd>
+ <dt>0x04</dt>
+ <dd>Enable tracing prints.</dd>
+</dl>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">virtio(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">virtio_scsi</code> driver was written by
+ <span class="An">Bryan Venteicher</span>
+ &lt;<a class="Mt" href="mailto:bryanv@FreeBSD.org">bryanv@FreeBSD.org</a>&gt;.
+ It first appeared in <span class="Ux">FreeBSD 10.0</span>.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">June 24, 2012</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>