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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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563 lines
36 KiB
HTML
563 lines
36 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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</style>
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|
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</head>
|
||
<body id="xen" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect1">
|
||
<h2 id="xen"><a class="anchor" href="#xen"></a><a class="link" href="#xen">20. Xen</a></h2>
|
||
<div class="sectionbody">
|
||
<div class="paragraph">
|
||
<p><a href="https://en.wikipedia.org/wiki/Xen" class="bare">https://en.wikipedia.org/wiki/Xen</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: get prototype working and then properly integrate:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-xen</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Source: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/build-xen">build-xen</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This script attempts to build Xen for aarch64 and feed it into QEMU through <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/submodules/boot-wrapper-aarch64">submodules/boot-wrapper-aarch64</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: other archs not yet attempted.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The current bad behaviour is that it prints just:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>Boot-wrapper v0.2</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and nothing else.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We will also need <code>CONFIG_XEN=y</code> on the Linux kernel, but first Xen should print some Xen messages before the kernel is ever reached.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>If we pass to QEMU the xen image directly instead of the boot wrapper one:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>-kernel ../xen/xen/xen</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>then Xen messages do show up! So it seems that the configuration failure lies in the boot wrapper itself rather than Xen.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Maybe it is also possible to run Xen directly like this: QEMU can already load multiple images at different memory locations with the generic loader: <a href="https://github.com/qemu/qemu/blob/master/docs/generic-loader.txt" class="bare">https://github.com/qemu/qemu/blob/master/docs/generic-loader.txt</a> which looks something along:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>-kernel file1.elf -device loader,file=file2.elf</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>so as long as we craft the correct DTB and feed it into Xen so that it can see the kernel, it should work. TODO does QEMU support patching the auto-generated DTB with pre-generated options? In the worst case we can just dump it hand hack it up though with <code>-machine dumpdtb</code>, see: <a href="device-tree-emulator-generation.html">Section 9.4, “Device tree emulator generation”</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Bibliography:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>this attempt was based on: <a href="https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/FastModels" class="bare">https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/FastModels</a> which is the documentation for the ARM Fast Models closed source simulators.</p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/qemu-system-aarch64" class="bare">https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions/qemu-system-aarch64</a> this is the only QEMU aarch64 Xen page on the web. It uses the Ubuntu aarc64 image, which has EDK2.</p>
|
||
<div class="paragraph">
|
||
<p>I however see no joy on blobs. Buildroot does not seem to support EDK 2.</p>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Link on readme <a href="https://stackoverflow.com/questions/49348453/xen-on-qemu-with-arm64-architecture" class="bare">https://stackoverflow.com/questions/49348453/xen-on-qemu-with-arm64-architecture</a></p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
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|
||
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|
||
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|
||
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|
||
<p>← Previous: <a href="arm-mbed.html">ARM Mbed</a> | ↑ Up: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="u-boot.html">U-Boot</a> →</p>
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