[PATCH V3 00/10] KVM: x86: MMU: Clean up x86's mmu code for future work

[Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>]

It seems like you all are busy now, so I've made this patch set so that
mechanical and trivial changes come before.

V2->V3:
Patch 01: Rebased and moved here. Updated stale comments.
  We may also want to use a union, inside the struct, to eliminate casting to
  (u64 *) type when spte is in the head in the future.
Patch 02-05: No change.
  About patch 03: There was a comment on the usage of braces for a single line
  else-if statement from Xiao. As I answered, checkpatch did not complain about
  this, and when the corresponding if block has multiple lines, some developers
  prefer/recommend this style. Feel free to modify it if you don't like it.
Patch 06: Changed WARN_ON to BUG_ON as Marcelo suggested.
Patch 07: Removed unnecessary zero-initialization of sp->parent_ptes as Xiao
  suggested.

I think these seven patches are ready for inclusion.

Patch 08-10: No change now, though there were a few comments.
  This patch set is not intended to optimize anything, so these patches try to
  keep the way mark_unsync() gets called as much as possible: the only changes
  are when this gets called for the new parent_pte and when
  mmu_page_add_parent_pte() gets called.

For these three, I'm not sure what we should do now, still RFC?
We can also consider other approaches, e.g. moving link_shadow_page() in the
kvm_get_mmu_page() as Paolo suggested before.

  Takuya

Takuya Yoshikawa (10):
  [01] KVM: x86: MMU: Encapsulate the type of rmap-chain head in a new struct
  [02] KVM: x86: MMU: Remove unused parameter of __direct_map()
  [03] KVM: x86: MMU: Add helper function to clear a bit in unsync child bitmap
  [04] KVM: x86: MMU: Make mmu_set_spte() return emulate value
  [05] KVM: x86: MMU: Remove is_rmap_spte() and use is_shadow_present_pte()
  [06] KVM: x86: MMU: Consolidate BUG_ON checks for reverse-mapped sptes
  [07] KVM: x86: MMU: Move initialization of parent_ptes out from kvm_mmu_alloc_page()
  [08] KVM: x86: MMU: Use for_each_rmap_spte macro instead of pte_list_walk()
  [09] KVM: x86: MMU: Move parent_pte handling from kvm_mmu_get_page() to link_shadow_page()
  [10] KVM: x86: MMU: Remove unused parameter parent_pte from kvm_mmu_get_page()

 Documentation/virtual/kvm/mmu.txt |   4 +-
 arch/x86/include/asm/kvm_host.h   |   8 +-
 arch/x86/kvm/mmu.c                | 370 ++++++++++++++++++--------------------
 arch/x86/kvm/mmu_audit.c          |  15 +-
 arch/x86/kvm/paging_tmpl.h        |  20 +--
 5 files changed, 201 insertions(+), 216 deletions(-)

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2.1.0