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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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550 lines
34 KiB
HTML
550 lines
34 KiB
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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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</head>
|
||
<body id="qemu-record-and-replay" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="qemu-record-and-replay"><a class="anchor" href="#qemu-record-and-replay"></a><a class="link" href="#qemu-record-and-replay">23.9.5. QEMU record and replay</a></h4>
|
||
<div class="paragraph">
|
||
<p>QEMU runs, unlike gem5, are not deterministic by default, however it does support a record and replay mechanism that allows you to replay a previous run deterministically.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This awesome feature allows you to examine a single run as many times as you would like until you understand everything:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre># Record a run.
|
||
./run --eval-after './linux/rand_check.out;./linux/poweroff.out;' --record
|
||
# Replay the run.
|
||
./run --eval-after './linux/rand_check.out;./linux/poweroff.out;' --replay</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>A convenient shortcut to do both at once to test the feature is:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./qemu-rr --eval-after './linux/rand_check.out;./linux/poweroff.out;'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>By comparing the terminal output of both runs, we can see that they are the exact same, including things which normally differ across runs:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>timestamps of dmesg output</p>
|
||
</li>
|
||
<li>
|
||
<p><a href="rand-check-out.html">rand_check.out</a> output</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The record and replay feature was revived around QEMU v3.0.0. In v5.2.0 it is quite usable, almost all peripherals and vCPUs are supported.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Documented at: <a href="https://github.com/qemu/qemu/blob/v5.2.0/docs/replay.txt" class="bare">https://github.com/qemu/qemu/blob/v5.2.0/docs/replay.txt</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>replay may be used with with network:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./qemu-rr --eval-after 'ifup -a;wget -S google.com;./linux/poweroff.out;'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p><code>arm</code> and <code>aarch64</code> targets can also be used with rr:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./qemu-rr --arch aarch64 --eval-after './linux/rand_check.out;./linux/poweroff.out;'
|
||
./qemu-rr --arch aarch64 --eval-after 'ifup -a;wget -S google.com;./linux/poweroff.out;'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Replay also supports <a href="initrd.html">initrd</a> and no disk:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-buildroot --arch aarch64 --initrd
|
||
./qemu-rr --arch aarch64 --eval-after './linux/rand_check.out;./linux/poweroff.out;' --initrd</pre>
|
||
</div>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="qemu-reverse-debugging.html">QEMU reverse debugging</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="trace-source-lines.html">Trace source lines</a> | ↑ Up: <a href="tracing.html">Tracing</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="qemu-reverse-debugging.html">QEMU reverse debugging</a> →</p>
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