[Xen-devel] HYPERVISOR_iret()

["Swapna Shingre" <amuswaps@xxxxxxxxx>]

I am trying to add a hypercall to replace the iret instruction in xenolinux, so that everytime control comes to xen when guest OS executes 'iret'.
I found that there already exists a hypercall HYPERVISOR_iret in xen. 
  What is the exact functionality of HYPERVISOR_iret? In which cases is it called by the guest OS? 



Please help.
-swapna


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