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

from [Min Lee]

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To:	"Ashish Bijlani" <ashish.bijlani@xxxxxxxxx>
Subject:	Re: [Xen-devel] [Q] guest system call doesn't do do_iret() ?
From:	"Min Lee" <min.lee@xxxxxxxxxx>
Date:	Fri, 7 Dec 2007 14:36:29 -0500
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Yes, I've tried Dom0's.
Does it make difference if I try DomU's?

----- Original Message -----From: Ashish BijlaniTo: Min LeeSent: 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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