[PATCH 0 of 9] x86/mm: Memory Sharing Overhaul V2

[Andres Lagar-Cavilla <andres@lagarcavilla.org>]

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.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Adin Scannell <adin@scannell.ca>

 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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