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<section id="qemu-vhost-user-rng-rng-emulation">
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<h1>QEMU vhost-user-rng - RNG emulation<a class="headerlink" href="#qemu-vhost-user-rng-rng-emulation" title="Link to this heading"></a></h1>
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<section id="background">
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<h2>Background<a class="headerlink" href="#background" title="Link to this heading"></a></h2>
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<p>What follows builds on the material presented in vhost-user.rst - it should
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be reviewed before moving forward with the content in this file.</p>
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</section>
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<section id="description">
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<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
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<p>The vhost-user-rng device implementation was designed to work with a random
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number generator daemon such as the one found in the vhost-device crate of
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the rust-vmm project available on github [1].</p>
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<p>[1]. <a class="reference external" href="https://github.com/rust-vmm/vhost-device">https://github.com/rust-vmm/vhost-device</a></p>
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</section>
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<section id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Link to this heading"></a></h2>
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<p>The daemon should be started first:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">host</span><span class="c1"># vhost-device-rng --socket-path=rng.sock -c 1 -m 512 -p 1000</span>
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</pre></div>
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</div>
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<p>The QEMU invocation needs to create a chardev socket the device can
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use to communicate as well as share the guests memory over a memfd.</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>host# qemu-system \
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-chardev socket,path=$(PATH)/rng.sock,id=rng0 \
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-device vhost-user-rng-pci,chardev=rng0 \
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-m 4096 \
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-object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on \
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-numa node,memdev=mem \
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...
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</pre></div>
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</div>
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