x86/mm: Memory Sharing Overhaul V2

This patch series proposes a comprehensive overhaul of the memory sharing code. We include

- Clean ups.
- A reworked locking discipline. We introduce the use of per page locks to protect additions and removals of gfns to shared pages. We use RCU to manage a global list of shared pages used for auditing. The end result is the removal of the sharing global lock.
- New features:
+ Polling stats via console.
+ More stats: frames that are shared, pages that are saved. due to sharing
+ New sharing domctl to add a shared page directly to a whole in the physmap.
+ New sharing domctl to perform audits.
Relevant tools patches sent in a separate series.

A consequence of our modifications is a change to the sharing API. While we refresh the only user of the sharing API in the tree, we want to make sure we are not affecting any other users of the sharing API.

 xen/arch/x86/mm.c                 |    6 +-
 xen/arch/x86/mm/mem_sharing.c     |   91 +++--
 xen/arch/x86/mm/mem_sharing.c     |  560 +++++++++++++++++++------------------
 xen/include/asm-x86/mem_sharing.h |   19 +-
 xen/include/asm-x86/mm.h          |   11 +-
 xen/include/public/domctl.h       |    3 +
 xen/arch/x86/mm/mem_sharing.c     |   57 +++-
 xen/include/public/domctl.h       |    9 +
 xen/arch/x86/mm.c                 |    6 -
 xen/arch/x86/mm/mem_sharing.c     |   29 +
 xen/arch/x86/x86_64/compat/mm.c   |    6 +
 xen/arch/x86/x86_64/mm.c          |    7 +
 xen/include/asm-x86/mem_sharing.h |    1 +
 xen/include/public/memory.h       |    1 +
 xen/arch/x86/mm.c                 |   74 +----
 xen/arch/x86/mm/mem_sharing.c     |  280 +++++++++++++++++-
 xen/arch/x86/mm/mm-locks.h        |   31 +-
 xen/include/asm-x86/mm.h          |   28 +-
 xen/arch/x86/mm/mem_sharing.c     |  104 +++++++
 xen/include/public/domctl.h       |    3 +-
 xen/arch/ia64/xen/mm.c            |    6 +
 xen/arch/x86/mm/mem_sharing.c     |    8 +
 xen/common/keyhandler.c           |    7 +-
 xen/include/xen/mm.h              |    3 +
 xen/arch/x86/mm/mem_sharing.c     |   15 +-
 xen/include/public/domctl.h       |    1 +
 xen/arch/x86/mm/mem_sharing.c     |   83 ++---
 xen/arch/x86/mm/mm-locks.h        |   18 -
 xen/include/asm-x86/mem_sharing.h |    3 +-
 29 files changed, 957 insertions(+), 513 deletions(-)

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