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Subject[PATCH v7 00/10] KVM: MMU: fast page fault
- 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:

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

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