Changelog v1->v2: dropped slot_hint and wrapper.

As Avi said, get_user() alone achieved most of the improvement.

Before
  2.994 us   |  paging64_walk_addr_generic();
  1.480 us   |  paging64_walk_addr_generic();
  0.996 us   |  paging64_walk_addr_generic();
  1.108 us   |  paging64_walk_addr_generic();
  0.962 us   |  paging64_walk_addr_generic();
  2.063 us   |  paging64_walk_addr_generic();
  1.379 us   |  paging64_walk_addr_generic();
  0.962 us   |  paging64_walk_addr_generic();
  1.085 us   |  paging64_walk_addr_generic();
  2.965 us   |  paging64_walk_addr_generic();

After
  2.264 us   |  paging64_walk_addr_generic();
  1.079 us   |  paging64_walk_addr_generic();
  0.648 us   |  paging64_walk_addr_generic();
  0.703 us   |  paging64_walk_addr_generic();
  0.635 us   |  paging64_walk_addr_generic();
  0.869 us   |  paging64_walk_addr_generic();
  0.529 us   |  paging64_walk_addr_generic();
  0.702 us   |  paging64_walk_addr_generic();
  0.529 us   |  paging64_walk_addr_generic();
  0.691 us   |  paging64_walk_addr_generic();


A little surprise was that the original version itself was
a bit fater than before.

But I tested this with today's latest kvm.git and some parts
had been changed, so it could be.

Anyway, this patch improves by some degree!


Takuya
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