In page fault handlers, both mapping_level_dirty_bitmap() and mapping_level()
do a memory slot search, binary search, through kvm_vcpu_gfn_to_memslot(), which
may not be negligible especially for virtual machines with many memory slots.
With a bit of cleanup effort, the patch set reduces this overhead.
[PATCH 1/5] KVM: x86: MMU: Make force_pt_level bool
[PATCH 2/5] KVM: x86: MMU: Simplify force_pt_level calculation code in
FNAME(page_fault)()
[PATCH 3/5] KVM: x86: MMU: Merge mapping_level_dirty_bitmap() into
mapping_level()
[PATCH 4/5] KVM: x86: MMU: Remove mapping_level_dirty_bitmap()
[PATCH 5/5] KVM: x86: MMU: Eliminate an extra memory slot search in
mapping_level()
Takuya
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