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

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

Yes, I've tried Dom0's.
Does it make difference if I try DomU's?

----- Original Message ----- 
From: Ashish Bijlani 
To: Min Lee 
Sent: Friday, December 07, 2007 10:53 AM
Subject: Re: [Xen-devel] [Q] guest system call doesn't do do_iret() ?


are you trying to intercept Dom0's system calls? 

On Dec 5, 2007 11:22 PM, Min Lee <min.lee@xxxxxxxxxx> wrote:

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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