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[Xen-devel] debugging hypervisor console I/O

If you have a guest you are just booting with no console I/O device for 
xen in the guest, I assume that HYPERVISOR_console_io(0, "HI!\n", 4)

will get some console I/O down to xen, right? And that xen will arrange 
for the console I/o to appear on port, e.g., 9611 if I have set the 
console_port to 9611 in /etc/xc/defaults. 

I have a guest that can exit but not do console I/O, and I'm trying to 
track down what is missing. 

What's a reasonable starting point to debug a lack of console I/O? debug 
print in Xen for domains > 0?



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