* [Q] guest system call doesn't do do_iret() ?
@ 2007-12-06 4:22 Min Lee
[not found] ` <ec55b17e0712070753q3677a610y5a4a252e967268da@mail.gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: Min Lee @ 2007-12-06 4:22 UTC (permalink / raw)
To: xen-devel
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
^ permalink raw reply [flat|nested] 2+ messages in thread[parent not found: <ec55b17e0712070753q3677a610y5a4a252e967268da@mail.gmail.com>]
* Re: [Q] guest system call doesn't do do_iret() ? [not found] ` <ec55b17e0712070753q3677a610y5a4a252e967268da@mail.gmail.com> @ 2007-12-07 19:36 ` Min Lee 0 siblings, 0 replies; 2+ messages in thread From: Min Lee @ 2007-12-07 19:36 UTC (permalink / raw) To: Ashish Bijlani; +Cc: xen-devel 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@gatech.edu> 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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel ^ permalink raw reply [flat|nested] 2+ messages in thread
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2007-12-06 4:22 [Q] guest system call doesn't do do_iret() ? Min Lee
[not found] ` <ec55b17e0712070753q3677a610y5a4a252e967268da@mail.gmail.com>
2007-12-07 19:36 ` Min Lee
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