terovn

AMD-V (SVM) intercept software interrupt, how to get vector number?

Discussion created by terovn on Apr 15, 2009
Latest reply on May 13, 2009 by devcentral
AMD-V (SVM) intercept software interrupt, how to get vector number?

I was able to intercept int n by setting up the SINT flag.

But my question is how to know the value of n (vector number)?

The manual does not tell how to do it. I tested by creating a custom int x and searched for x  in VMCB and visible registers after #VMEXIT but could not find it.

I guess I could try to fetch the opcode from guest cs:ip, but then I have to write code to handle guest segmentation and paging, which is tedious. And I couldnot think of any reason why AMD does not give the vector number to the VMM after a software interrupt interception. Hope someone knows the answer.

Thanks,

 

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