Injecting a page fault into the guest OS?

["Estrada, Zachary J" <zestrad2@illinois.edu>]

Hi all,

I'm trying to inject a page fault into a Linux guest, but when tracing the guest 
OS I don't see the injected fault making it to do_page_fault in the guest. That 
is, I don't see a do_page_fault call with a CR2 matching the address I'm passing.

I'm currently calling the kvm_inject_page_fault(vcpu, &exception) function from
a custom kernel module. I have a simple callback at the top of vmx_vcpu_run that 
invokes my module before the asm for vmlaunch/resume. I have tried with various 
permutations of exception.error_code, but haven't found anything that works. Is 
there something else I need to do? My system does not have tdp, but I am looking 
for something that's agnostic of the underlying virtual mmu.

Thanks!
--Zak