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<li class="toctree-l2 current"><a class="current reference internal" href="#">Multi-process QEMU</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#configuration">1) Configuration</a></li>
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<section id="multi-process-qemu">
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<span id="id1"></span><h1>Multi-process QEMU<a class="headerlink" href="#multi-process-qemu" title="Link to this heading"></a></h1>
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<p>This document describes how to configure and use multi-process qemu.
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For the design document refer to docs/devel/multi-process.rst.</p>
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<section id="configuration">
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<h2>1) Configuration<a class="headerlink" href="#configuration" title="Link to this heading"></a></h2>
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<p>multi-process is enabled by default for targets that enable KVM</p>
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</section>
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<section id="usage">
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<h2>2) Usage<a class="headerlink" href="#usage" title="Link to this heading"></a></h2>
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<p>Multi-process QEMU requires an orchestrator to launch.</p>
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<p>Following is a description of command-line used to launch mpqemu.</p>
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<ul>
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<li><p>Orchestrator:</p>
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<ul class="simple">
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<li><p>The Orchestrator creates a unix socketpair</p></li>
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<li><p>It launches the remote process and passes one of the
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sockets to it via command-line.</p></li>
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<li><p>It then launches QEMU and specifies the other socket as an option
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to the Proxy device object</p></li>
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</ul>
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</li>
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<li><p>Remote Process:</p>
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<ul>
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<li><p>QEMU can enter remote process mode by using the “remote” machine
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option.</p></li>
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<li><p>The orchestrator creates a “remote-object” with details about
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the device and the file descriptor for the device</p></li>
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<li><p>The remaining options are no different from how one launches QEMU with
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devices.</p></li>
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<li><p>Example command-line for the remote process is as follows:</p>
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<blockquote>
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<div><p>/usr/bin/qemu-system-x86_64 -machine x-remote -device lsi53c895a,id=lsi0 -drive id=drive_image2,file=/build/ol7-nvme-test-1.qcow2 -device scsi-hd,id=drive2,drive=drive_image2,bus=lsi0.0,scsi-id=0 -object x-remote-object,id=robj1,devid=lsi0,fd=4,</p>
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</div></blockquote>
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</li>
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</ul>
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</li>
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<li><p>QEMU:</p>
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<ul>
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<li><p>Since parts of the RAM are shared between QEMU & remote process, a
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memory-backend-memfd is required to facilitate this, as follows:</p>
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<p>-object memory-backend-memfd,id=mem,size=2G</p>
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</li>
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<li><p>A “x-pci-proxy-dev” device is created for each of the PCI devices emulated
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in the remote process. A “socket” sub-option specifies the other end of
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unix channel created by orchestrator. The “id” sub-option must be specified
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and should be the same as the “id” specified for the remote PCI device</p></li>
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<li><p>Example commandline for QEMU is as follows:</p>
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<blockquote>
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<div><p>-device x-pci-proxy-dev,id=lsi0,socket=3</p>
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</div></blockquote>
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</li>
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</ul>
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</li>
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