Your Grub config shows you're passing: com1=115200 to Xen. I suspect Xen 
would reject that format and not produce any serial output. You really do 
need the full: com1=115200,8n1 or it might not work.
Unfortunately, having the serial console working in Linux is not quite enough 
because Xen has control of the serial port and XenLinux has to go through Xen. 
 You should at least be seeing something of Xen output on the serial line even 
if Linux isn't booting.
Thanks for your patience, you should be up and running again soon.
HTH,
Mark
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