[Xen-devel] Information required on TRACE_VMEXIT working.

[aditya shevalkar <aditya27783@xxxxxxxxxxx>]

Hi all,

Can anybody explain the process of TRACE_VMEXIT ?
I am trying to understand its use in xen3.0.3\xen\arch\x86\hvm\vmx\vmx.c 
file in the vmx_vmexit_handler function. 
Also explain the meaning of its arguments and from where does it fetches 
the values for different arguments. 
Some code snippets from above file are given below: 


TRACE_VMEXIT(0,exit_reason); 
switch ( exit_reason ) 
{ 
case EXIT_REASON_EXCEPTION_NMI: 



vector &= INTR_INFO_VECTOR_MASK; 
TRACE_VMEXIT(1,vector); 


__vmread(EXIT_QUALIFICATION, &va); 
__vmread(VM_EXIT_INTR_ERROR_CODE, &regs->error_code); 
TRACE_VMEXIT(3, regs->error_code); 
TRACE_VMEXIT(4, va); 

Also trying to understand the following expression in the same file: 
#define TRACE_VMEXIT(index,value) this_cpu(trace_values)[index]=value 


With Regards, 
Aditya Shevalkar.


                
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