[Xen-devel] [Q] guest system call doesn't do do_iret() ?

["Min Lee" <min.lee@xxxxxxxxxx>]

Hello.
Basically I'd like to intercept guest's (of course, Linux) system call 
entry/exit,
so I've commented out fast path and I could intercept 'int 0x80' calls,
and I expected every system call should call xen's do_iret() , i.e,
HYPERVISOR_iret, but it doesn't seem that they call it !
Any idea or comments? What am I missing here?
If the guest doesn't use HYPERVISOR_iret, how do they return to userland?
Thanks in advance.

Min 

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