Help With Identifying CPUID faulting logic in Xen code

[Fonyuy-Asheri Caleb <fonyuy-asheri.caleb@xxxxxxxx>]

Hello,

I am interested in finding understanding how xen handles CPUID faulting and 

VM exits in general. Please can someone indicate to me the concerned files? 

I want to know how xen detects the execution of the CPUID instruction and 

ensures a guest only gets the features defined in cpuid-autogen.h file 

depending on the guest type. 

I started looking at the file xen/arch/x86/cpuid.c but don't really know which other 

files to check next. 

Thanks

Caleb