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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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534 lines
34 KiB
HTML
534 lines
34 KiB
HTML
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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|
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|
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.nav-footer > p > a {white-space: nowrap;}</style>
|
||
</head>
|
||
<body id="kvm" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect1">
|
||
<h2 id="kvm"><a class="anchor" href="#kvm"></a><a class="link" href="#kvm">10. KVM</a></h2>
|
||
<div class="sectionbody">
|
||
<div class="paragraph">
|
||
<p><a href="https://en.wikipedia.org/wiki/Kernel-based_Virtual_Machine">KVM</a> is Linux kernel interface that <a href="benchmark-linux-kernel-boot.html">greatly speeds up</a> execution of virtual machines.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>You can make QEMU or <a href="gem5-kvm.html">gem5</a> by passing enabling KVM with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --kvm</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>KVM works by running userland instructions natively directly on the real hardware instead of running a software simulation of those instructions.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Therefore, KVM only works if you the host architecture is the same as the guest architecture. This means that this will likely only work for x86 guests since almost all development machines are x86 nowadays. Unless you are <a href="https://www.youtube.com/watch?v=8ItXpmLsINs">running an ARM desktop for some weird reason</a> :-)</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We don’t enable KVM by default because:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>it limits visibility, since more things are running natively:</p>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>can’t use <a href="gdb.html">GDB</a></p>
|
||
</li>
|
||
<li>
|
||
<p>can’t do <a href="tracing.html">instruction tracing</a></p>
|
||
</li>
|
||
<li>
|
||
<p>on gem5, you lose <a href="gem5-run-benchmark.html">cycle counts</a> and therefor any notion of performance</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p>QEMU kernel boots are already <a href="benchmark-linux-kernel-boot.html">fast enough</a> for most purposes without it</p>
|
||
</li>
|
||
</ul>
|
||
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|
||
<div class="paragraph">
|
||
<p>One important use case for KVM is to fast forward gem5 execution, often to skip boot, take a <a href="gem5-checkpoint.html">gem5 checkpoint</a>, and then move on to a more detailed and slow simulation</p>
|
||
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|
||
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|
||
<ul>
|
||
<li>
|
||
<p><a href="kvm-arm.html">KVM arm</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-kvm.html">gem5 KVM</a></p>
|
||
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|
||
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|
||
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|
||
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|
||
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|
||
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|
||
<p>← Previous: <a href="device-tree-emulator-generation.html">Device tree emulator generation</a> | ↑ Up: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="kvm-arm.html">KVM arm</a> →</p>
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