https://bugzilla.kernel.org/show_bug.cgi?id=27052





--- Comment #12 from Marcelo Tosatti <mtosa...@redhat.com>  2011-01-25 13:55:05 
---
It gets inconsistent if mmu_set_spte updates an already present spte with a 
different gfn. For example:

- unsync page spte N gfn A
- guest updates gpte that spte N shadows with gfn B
- page fault updates sptes N with gfn B, via mmu_set_spte
- sp->gfns[] contains stale data

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