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Subject[PATCH v5 0/9] KVM: fast page fault
This are some changes from Marcelo's review:
- drop SPTE_WRITE_PROTECT bit, now, only one bit is needed to do
lockless update.

- always atomicly update spte if it can be updated out of mmu-lock.

- flod the judgement of tlb flush into mmu_spte_update(), make the
code easilyer audited.

Performance result:
- autoest migration test (smp2.Fedora.16.64.migrate.with_autotest.dbench.unix):
before after
smp2.Fedora.16.64.migrate.unix 93 91 +2.1%
smp2.Fedora.16.64.migrate.with_autotest.dbench.unix 218 188 +13.7%

- the benchmark attached is used to measure the resuming time
after dirty-log
before after
Run 10 times, Avg time: 512466818 ns. 269231261 ns +47.5%
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