[Xen-users] Where do System calls go?

[helicoterus-elih@xxxxxxxx]

I have a doubt about system calls on paravirtualized Xen environment (without 
virtualization extensions).
When a program on a domU invokes a sys call, this arrives to its kernel (on 
ring 3) and then it is send to VMM (on ring 0) or system call goes directly to 
VMM?
Normally a system call goes to its O.S. libc and then a handler on kernel 
carries it on.
I do not understand what is the problem of sys call.

Thank you.





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