[PATCH 0/4] KVM: MMU: mmu audit code improved

[Xiao Guangrong]

The audit can help us to detect the mmu bugs as early as possible, it's also
can help us to fix them.

It's so useful but the linux distribution is imposable to use it since:

- it need enable it by define "AUDIT" macro and compile it
- the audit code is very high overload, it lets the guest mostly hung

So, this patchset supports to enable/disable it dynamically, it's very low
overhead if disable it, and it lowers the audit frequency to assure the guest
running.

After this patchset, we can enable it by:
mount -t debugfs none debugfs
echo 1 > debugfs/kvm/mmu-debug

disable it by:
echo 0 > debugfs/kvm/mmu-debug

default, the audit is disabled

[PATCH 1/4] KVM: MMU: support disable/enable mmu audit dynamically
[PATCH 2/4] KVM: MMU: improve active sp audit
[PATCH 3/4] KVM: MMU: improve spte audit
[PATCH 4/4] KVM: MMU: lower the aduit frequency
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