Re: [Xen-users] {Beginner's question}: Invoking hypercalls from domU PV guest domain

[Lakshman Jayaraju <Chethu2288@xxxxxxxxx>]

Hi Ian,


Am a student. As a part of my thesis, I am doing vulnerability analysis on
Xen hypervisor. Am still in initial stage. As per my understanding since am
trying to find vulnerability, I have to try from within user
boundaries(guest domain). I started with domU PV guest since it has got
hypercall interface.

Initially I tried in dom0 and I was able to invoke hypercalls successfully
by using xenctrl library. But am totally stuck in writing a program inside
domU PV guest domain. Am not getting how exactly I can invoke hypercalls in
my program.  

I could find xen.h and other files on my PV guest domain which contains
hypercalls and its definitions. But confused of whats next. Do I need to
write assembly code using *int 0x82h * in my LKM or any wrappers code
available to invoke hypercalls.

Kindly suggest me on this.


Thanks,
Lakshman.





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