Marcelo Tosatti wrote:
Some updates to the MMU audit code. The third patch is "guessy" because I could not find the notrap spte documentation, all I can see is the page-fault error code mask and match fields in the VMCS, but can't see the link of that to sptes. Can someone point it out please?
When bypass_guest_pf is set, we tell vmx not to trap if the fault is due to page-not-present. So if we know gpte.p == 0, we set spte.p = 0 and allow not-present page faults to go directly to the guest without trapping.
Of course, we still need to trap cases where gpte.p = 1 but we haven't mapped the page yet. So we set a reserved bit in the spte and trap on that.
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