Sending messages from Xen to a domain with VIRQ_DEBUG

[Rami Rosen <rosenrami@gmail.com>]

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Hello,

Is there a way to send messages (for debugging purposes) from Xen to a 
domain with some text?

I want to add "printk" messages in certain points in Xen for tracing
and debugging purposes.

As I understand, when I add printk messages to Xen they will appear only in
boot time on the terminal. After domain 0 is created and up, printk() 
messages
in Xen will not appear in /var/log/messages or on terminal.

I had tried to add in some point in Xen:

.........
for_each_vcpu(d,v)
send_guest_virq(v,VIRQ_DEBUG);
.....
When I reach this point in Xen , it generates the following:
in the syslog (of domain0)
...
netif_schedule_list:
kernel: ** End of netif_schedule_list **
...

(I assume that this is somehow connected to the call: 
request_irq(bind_virq_to_irq(VIRQ_DEBUG),...
in netback.c but I don't know the exact origin of this message)


Is there a way to send a message from Xen to a domain with some chosen text 
? 

Regards,
Rami Rosen

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