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Re: [Xen-devel] Printing debug message from hypervisor

  • To: Sandesh <sandesh.ahiremath@xxxxxxxxx>
  • From: Grzegorz MiÅoÅ <gm281@xxxxxxxxx>
  • Date: Tue, 10 Jun 2008 12:26:54 +0100
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Tue, 10 Jun 2008 04:27:24 -0700
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Which log are you looking at? Does 'xm dmesg' show anything more?
dmesg dose'nt contain any of my messages!!!

I did really mean:
xm dmesg

code it seems like we cant directly use printk, because the guest checks the
'console I/O ring buffer after receving an event for the same from
hypervisor ' . I chekced the functions of drivers/char/console.c and it has the funciton printk which is does generate the event for console I/ O but the

printk prototype is in lib.h (include/xen/lib.h)

Are you able to see _any_ output from the hypervisor at all? I don't
think printk in do_domctl will be any different.
I get only the messages from xend and from xc_lib but none of the
hypervisor printks' are getting printed.
Atleast i dont know where they are getting printed?? Is it in the
xenstore..i think not!!!

Xen can be configured to output it's messages on the serial line, and it also puts it in a buffer (console ring) for Dom0's attention, xm dmesg should print all the hypervisors output.



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