Xen users - Sep 2007 - How to set VMX trap on a perticular Memory Page

I am trying to locate the code (xen hypervisor or dom0) where xen is
configuring to hide the physical phages (MMIO or other physical pages)
from domain(s). This way CPU generates pagefault when domain tries to
access them, which causes VMExit to occur. 

 

In otherwords, there may be some where we must be registering pages to
hide from domain. ????? 

 

I do know where it gets handled (hvm_mmio_intercept, hvm_mmio_handlers,
hvm_mmio_access, hvm_send_assist_req in QEMU). But where do I
configure/set for example a specific 4K page to always pagefault based
VMExit. 

 

Appreciate any pointers...

-CD

 

 



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