http://lists.xensource.com/archives/html/xen-devel/2008-10/msg00195.html
2. build option :
Xen provides a number of build-time options which should be set as environment variables or passed on make's command-line.
- verbose=y
- Enable debugging messages when Xen detects an unexpected condition. Also enables console output from all domains.
- debug=y
- Enable debug assertions. Implies verbose=y. (Primarily useful for tracing bugs in Xen).
- debugger=y
- Enable the in-Xen debugger. This can be used to debug Xen, guest OSes, and applications.
- perfc=y
- Enable performance counters for significant events within Xen. The counts can be reset or displayed on Xen's console via console control keys.
http://en.opensuse.org/How_to_Capture_Xen_Hypervisor_and_Kernel_Messages_using_a_Serial_Cable
4. KDB
http://lists.xensource.com/archives/html/xen-devel/2008-11/msg00165.html
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