AMD-V missing page offset on NPF for instruction fetches

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Hello,

we want to implement a page tracing mechanism in KVM based on AMD SVM
using the second layer address translation.
As specified in AMD's system programmer's manual the hardware should
provide the faulting GPA in the EXITINFO2 field in VMCB when a PF/NPF
occurs. However, we have the problem that the last 12 bits of the GPA
are all 0 if the access was an instruction fetch. We now wanted to ask
if someone knows if this is a 'feature' implemented by AMD (and we
simply do not find it in the documentation) or if this behavior was
added by KVM?





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