[PATCH v2 00/15] vMTRR bugfix and optimization

[Xiao Guangrong]

Changlog:
- let's fix the bugs for noncoherent_dma guests first

- these changes are from Paolo's review
  1) use inline functions instead of union definition for 'struct kvm_mtrr'
  2) improve code style
  3) fix fixed_msr_to_range_index which does not return the actual value
  4) introduce kvm_set_var_mtrr() to make the code more clearer
  5) improve mtrr_for_each_mem_type() APIs and clean it up
  6) drop @unit_size in 'struct fixed_mtrr_segment'

- these changes are from David Matlack's review
  1) improve comment
  2) fix fixed_mtrr_range_end_addr that did not count entries correctly
  

There are some bugs in current code if noncoherent_dma is detected:
- KVM still uses hugepage even if the 4K pages in that ranges span between
  on different memory types and uses the cache type of first page to do memory
  mapping
  
- CR0.CD is not checked so that guest memory is not UC as it expected  

This patchset fixes these bugs and also do optimization and cleanups.

Xiao Guangrong (15):
  KVM: x86: fix CR0.CD virtualization
  KVM: x86: move MTRR related code to a separate file
  KVM: MTRR: handle MSR_MTRRcap in kvm_mtrr_get_msr
  KVM: MTRR: remove mtrr_state.have_fixed
  KVM: MTRR: exactly define the size of variable MTRRs
  KVM: MTRR: clean up mtrr default type
  KVM: MTRR: do not split 64 bits MSR content
  KVM: MTRR: improve kvm_mtrr_get_guest_memory_type
  KVM: MTRR: introduce fixed_mtrr_segment table
  KVM: MTRR: introduce var_mtrr_range
  KVM: MTRR: sort variable MTRRs
  KVM: MTRR: introduce fixed_mtrr_addr_* functions
  KVM: MTRR: introduce mtrr_for_each_mem_type
  KVM: MTRR: simplify kvm_mtrr_get_guest_memory_type
  KVM: MTRR: do not map huage page for non-consistent range

 arch/x86/include/asm/kvm_host.h |  17 +-
 arch/x86/kvm/Makefile           |   2 +-
 arch/x86/kvm/mmu.c              | 123 ++-----
 arch/x86/kvm/mtrr.c             | 708 ++++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/vmx.c              |  32 +-
 arch/x86/kvm/x86.c              | 223 +------------
 arch/x86/kvm/x86.h              |   6 +
 7 files changed, 778 insertions(+), 333 deletions(-)
 create mode 100644 arch/x86/kvm/mtrr.c

-- 
2.1.0

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