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    Subject[PATCH v7 00/10] KVM: MMU: fast page fault
    Changlog:
    - always atomicly update the spte if it can be updated out of mmu-lock
    - rename spte_can_be_writable() to spte_is_locklessly_modifiable()
    - cleanup and comment spte_write_protect()

    Performance result:
    (The benchmark can be found at: http://www.spinics.net/lists/kvm/msg73011.html)

    before after
    Run 10 times, Avg time: 538233957 ns. 249809853 ns. +53.6%



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