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<title>UML on 2G/2G hosts</title>
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<font size="-1"><a href="index.html">Site Home Page</a></font>
<br>
<font size="-1"><a href="http://uml.harlowhill.com">The UML Wiki</a></font>
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<font size="-1"><a href="http://usermodelinux.org">UML Community Site</a></font>
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<font size="-1"><a href="roadmap.html">The UML roadmap</a></font>
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<font size="-1"><a href="uses.html">What it's good for</a></font>
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<font size="-1"><a href="case-studies.html">Case Studies</a></font>
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<font size="-1"><a href="kernel.html">Kernel Capabilities</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/dl-sf.html">Downloading it</a></font>
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<font size="-1"><a href="run.html">Running it</a></font>
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<font size="-1"><a href="compile.html">Compiling</a></font>
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<font size="-1"><a href="install.html">Installation</a></font>
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<font size="-1"><a href="skas.html">Skas Mode</a></font>
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<font size="-1"><a href="patches.html">Incremental Patches</a></font>
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<font size="-1"><a href="tests.html">Test Suite</a></font>
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<font size="-1"><a href="devanon.html">Host memory use</a></font>
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<font size="-1"><a href="fs_making.html">Building filesystems</a></font>
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<font size="-1"><a href="faq.html">Troubles</a></font>
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<font size="-1"><a href="contrib.html">User Contributions</a></font>
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<font size="-1"><a href="links.html">Related Links</a></font>
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<font size="-1"><a href="todo.html">The ToDo list</a></font>
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<font size="-1"><a href="projects.html">Projects</a></font>
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<font size="-1"><a href="diary.html">Diary</a></font>
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<font size="-1"><a href="thanks.html">Thanks</a></font>
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<font size="-1"><a href="contacts.html">Contacts</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">Tutorials<br>
<font size="-1"><a href="UserModeLinux-HOWTO.html">The HOWTO (html)</a></font>
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<font size="-1"><a href="UserModeLinux-HOWTO.txt.gz">The HOWTO (text)</a></font>
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<font size="-1"><a href="hostfs.html">Host file access</a></font>
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<font size="-1"><a href="input.html">Device inputs</a></font>
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<font size="-1"><a href="shared_fs.html">Sharing filesystems</a></font>
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<font size="-1"><a href="fs.html">Creating filesystems</a></font>
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<font size="-1"><a href="resize.html">Resizing filesystems</a></font>
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<font size="-1"><a href="networking.html">Virtual Networking</a></font>
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<font size="-1"><a href="mconsole.html">Management Console</a></font>
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<font size="-1"><a href="debugging.html">Kernel Debugging</a></font>
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<font size="-1"><a href="honeypots.html">UML Honeypots</a></font>
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<font size="-1"><a href="gprof.html">gprof and gcov</a></font>
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<font size="-1"><a href="xtut.html">Running X</a></font>
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<font size="-1"><a href="trouble.html">Diagnosing problems</a></font>
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<font size="-1"><a href="config.html">Configuration</a></font>
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<font size="-1"><a href="slack_readme.html">Installing Slackware</a></font>
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<font size="-1"><a href="arch-port.html">Porting UML</a></font>
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<font size="-1"><a href="iomem.html">IO memory emulation</a></font>
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<font size="-1"><a href="2G-2G.html">UML on 2G/2G hosts</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/lksct/index.html">Adding a UML system call</a></font>
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<font size="-1"><a href="nesting.html">Running nested UMLs</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">How you can help<br>
<font size="-1"><a href="help-gen.html">Overview</a></font>
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<font size="-1"><a href="help-doc.html">Documentation</a></font>
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<font size="-1"><a href="help-userspace.html">Utilities</a></font>
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<font size="-1"><a href="help-kernel-v1.html">Kernel bugs</a></font>
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<font size="-1"><a href="projects.html">Kernel projects</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">Screenshots<br>
<font size="-1"><a href="net.html">A virtual network</a></font>
<br>
<font size="-1"><a href="x.html">An X session</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">Transcripts<br>
<font size="-1"><a href="login.html">A login session</a></font>
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<font size="-1"><a href="debug-session.html">A debugging session</a></font>
<br>
<font size="-1"><a href="slackinst.html">Slackware installation</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">Reference<br>
<font size="-1"><a href="switches.html">Kernel switches</a></font>
<br>
<font size="-1"><a href="slack_readme.html">Slackware README</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">Papers<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2000/index.html">ALS 2000 paper (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2000.tex">ALS 2000 paper (TeX)</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/als2000/slides.html">ALS 2000 slides</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/lca2001/lca.html">LCA 2001 slides</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ols2001/index.html">OLS 2001 paper (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/ols2001.tex">OLS 2001 paper (TeX)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2001/index.html">ALS 2001 paper (html)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/als2001.tex">ALS 2001 paper (TeX)</a></font>
<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ists2002/umlsec.htm">UML security (html)</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/lca2002/lca2002.htm">LCA 2002 (html)</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/wvu2002/wvu2002.htm">WVU 2002 (html)</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ists_rt/ists_rt.htm">Security Roundtable (html)</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/ols2002/ols2002.html">OLS 2002 slides</a></font>
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<font size="-1"><a href="http://user-mode-linux.sourceforge.net/slides/lwe2005/LWE2005.html">LWE 2005 slides</a></font>
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<tr align="left"><td valign="top" bgcolor="#e0e0e0">Fun and Games<br>
<font size="-1"><a href="http://user-mode-linux.sourceforge.net/cgi-bin/hangman">Kernel Hangman</a></font>
<br>
<font size="-1"><a href="sdotm.html">Disaster of the Month</a></font>
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</table>
</td>
<td valign="top" align="left">
<center>
<h3>UML on 2G/2G hosts</h3>
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<a name="Introduction"/><table width="100%" bgcolor="#e0e0e0">
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<td>
<b>
<font color="black">Introduction</font>
</b>
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<blockquote head="Introduction">
Most Linux machines are configured so that the kernel occupies the
upper 1G (0xc0000000 - 0xffffffff) of the 4G address space and
processes use the lower 3G (0x00000000 - 0xbfffffff). However, some
machine are configured with a 2G/2G split, with the kernel occupying
the upper 2G (0x80000000 - 0xffffffff) and processes using the lower
2G (0x00000000 - 0x7fffffff).
</blockquote>
<a name="The problem"/><table width="100%" bgcolor="#e0e0e0">
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<td>
<b>
<font color="black">The problem</font>
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<blockquote head="The problem">
The prebuilt UML binaries on this site will not run on 2G/2G hosts
because UML occupies the upper .5G of the 3G process address space
(0xa0000000 - 0xbfffffff). Obviously, on 2G/2G hosts, this is right
in the middle of the kernel address space, so UML won't even load - it
will immediately segfault.
</blockquote>
<a name="The solution"/><table width="100%" bgcolor="#e0e0e0">
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<td>
<b>
<font color="black">The solution</font>
</b>
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<blockquote head="The solution">
The fix for this is to rebuild UML from source after enabling
CONFIG_HOST_2G_2G (under 'General Setup'). This will cause UML to
load itself in the top .5G of that smaller process address space,
where it will run fine. See <a href="compile.html">
this page</a> if you need help building UML from source.
</blockquote>
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