KVM: MMU: fix mmu notifier invalidate handler for huge spte
The index wasn't calculated correctly (off by one) for huge spte so KVM guest was unstable with transparent hugepages. Signed-off-by: NAndrea Arcangeli <aarcange@redhat.com> Reviewed-by: NReviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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