[Xen-devel] [PATCH 00 of 12] Sharing overhaul

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

This patch series brings about a set of changes to the sharing support
in the hypervisor and tools. Specifically:

- Granular scalable locking: lock mfn's individually when sharing/unsharing
 them. Do not rely on a global lock. Use RCU to maintain a list of all
 shared frames for audit purposes.

- Refreshed stats: they now work (tm), and are accesible via libxc
 and console.

- Basic libxl/xl support for sharing.

- New sharing command "add to physmap", to directly populate a new domain
 with shared frames.

- Toolstack and memshr kept in sync.

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.

Patches 9, 10 11 are tools patches. Patches 1 to 8 are x86/mm. These hypervisor
bits apply on top of patch "x86/mm: Improve ring management for memory events.
Do not lose guest events" currently traversing the chain of reviewing.

Patch 12 is a simple testing tool for showcasing new functionality
and facilitating testing.

Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
Signed-off-by: Adin Scannell <adin@xxxxxxxxxxx>

 xen/arch/x86/mm/mem_sharing.c        |  550 +++++++++++++++++-----------------
 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                    |   74 +----
 xen/arch/x86/mm/mem_sharing.c        |  257 +++++++++++++++-
 xen/arch/x86/mm/mm-locks.h           |   15 +-
 xen/include/asm-x86/mm.h             |   27 +-
 xen/arch/x86/mm/mem_sharing.c        |   91 +++--
 xen/arch/x86/mm/mm-locks.h           |   18 +-
 xen/include/asm-x86/mm.h             |    3 +-
 xen/arch/x86/mm.c                    |    6 -
 xen/arch/x86/mm/mem_sharing.c        |   24 +
 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/mem_sharing.c        |  104 ++++++
 xen/include/public/domctl.h          |    3 +-
 xen/arch/ia64/xen/mm.c               |    5 +
 xen/arch/x86/mm.c                    |   14 +
 xen/common/keyhandler.c              |    7 +-
 xen/include/xen/mm.h                 |    3 +
 xen/arch/x86/mm/mem_sharing.c        |   94 ++---
 xen/arch/x86/mm/mm-locks.h           |   18 -
 xen/include/asm-x86/mem_sharing.h    |    3 +-
 tools/blktap2/drivers/tapdisk-vbd.c  |    6 +-
 tools/blktap2/drivers/tapdisk.h      |    2 +-
 tools/libxc/xc_memshr.c              |   63 +++-
 tools/libxc/xenctrl.h                |   19 +-
 tools/memshr/bidir-daemon.c          |   34 +-
 tools/memshr/bidir-hash.h            |   12 +-
 tools/memshr/interface.c             |   30 +-
 tools/memshr/memshr.h                |   11 +-
 tools/libxc/xc_memshr.c              |   10 +
 tools/libxc/xenctrl.h                |   17 +
 docs/man/xl.pod.1                    |   13 +
 tools/libxl/libxl.c                  |    2 +
 tools/libxl/libxl_types.idl          |    2 +
 tools/libxl/xl.h                     |    1 +
 tools/libxl/xl_cmdimpl.c             |   66 ++++
 tools/libxl/xl_cmdtable.c            |    5 +
 tools/tests/mem-sharing/Makefile     |   26 +
 tools/tests/mem-sharing/memshrtool.c |  165 ++++++++++
 46 files changed, 1371 insertions(+), 543 deletions(-)

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