xen setup

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install xen on centos 5.0:
http://www.howtoforge.com/centos_5.0_xen
install xen on Fedora 8:
http://blog.xen.org/index.php/2008/04/08/install-and-run-xen-on-fedora-8/
http://sysdigg.blogspot.com/2008/01/how-to-install-xen-in-fedora-8.html

Virtualization in Fedora 8: (more detailed info)
http://fedoraproject.org/wiki/Docs/Fedora8VirtQuickStart

Problem
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1. the display problem
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(EE) GARTInit: Unable to open /dev/agpgart

/etc/X11/xorg.conf:
Identifier "Videocard0"
Driver "Intel" => "vesa"

But Resolution can only be adjusted to 1280x1024.
sucks.

2. two mouse cursors exist in the window
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Press Ctrl+Alt to release the pointer of the console window.
when clicking on the virtual console window, the mouse pointer will be 'grabbed' and confined to the console window until Ctrl+Alt is pressed.

3. start problem
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When the OS in Xen is shut down, it can not be restarted again.
$ sudo service xend restart
can do the trick.