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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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568 lines
35 KiB
HTML
568 lines
35 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>>. EVERYTHING is built from source. <<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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font-size: 0.9em;} #content{display: flex; flex-direction: column; flex: 1 1 auto;}
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|
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</head>
|
||
<body id="gem5-9p" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="gem5-9p"><a class="anchor" href="#gem5-9p"></a><a class="link" href="#gem5-9p">15.4.3. gem5 9P</a></h4>
|
||
<div class="paragraph">
|
||
<p>Is possible on aarch64 as shown at: <a href="https://gem5-review.googlesource.com/c/public/gem5/+/22831" class="bare">https://gem5-review.googlesource.com/c/public/gem5/+/22831</a>, and it is just a matter of exposing to X86 for those that want it.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Enable it by passing the <code>--vio-9p</code> option on the fs.py gem5 command line:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --arch aarch64 --emulator gem5 -- --vio-9p</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then on the guest:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>mkdir -p /mnt/9p/gem5
|
||
mount -t 9p -o trans=virtio,version=9p2000.L,aname=/path/to/linux-kernel-module-cheat/out/run/gem5/aarch64/0/m5out/9p/share gem5 /mnt/9p/gem5
|
||
echo asdf > /mnt/9p/gem5/qwer</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Yes, you have to pass the full path to the directory on the host. Yes, this is horrible.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The shared directory is:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>out/run/gem5/aarch64/0/m5out/9p/share</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>so we can observe the file the guest wrote from the host with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>out/run/gem5/aarch64/0/m5out/9p/share/qwer</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and vice versa:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>echo zxvc > out/run/gem5/aarch64/0/m5out/9p/share/qwer</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>is now visible from the guest:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cat /mnt/9p/gem5/qwer</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Checkpoint restore with an open mount will likely fail because gem5 uses an ugly external executable to implement diod. The protocol is not very complex, and QEMU implements it in-tree, which is what gem5 should do as well at some point.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Also checkpoint without <code>--vio-9p</code> and restore with <code>--vio-9p</code> did not work either, the mount fails.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>However, this did work, on guest:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>unmount /mnt/9p/gem5
|
||
m5 checkpoint</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>then restore with the detalied CPU of interest e.g.</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --arch aarch64 --emulator gem5 -- --vio-9p --cpu-type DerivO3CPU --caches</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Tested on gem5 b2847f43c91e27f43bd4ac08abd528efcf00f2fd, LKMC 52a5fdd7c1d6eadc5900fc76e128995d4849aada.</p>
|
||
</div>
|
||
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|
||
<ul>
|
||
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|
||
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|
||
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|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="9p-getting-started.html">9P getting started</a> | ↑ Up: <a href="9p.html">9P</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="nfs.html">NFS</a> →</p>
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