[PATCH v11] claim and its friends for allocating multiple self-ballooning guests.

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

[This is mostly a copy-n-paste from the cover letter from v10 of the patches]

Two of these patches (Dan's) have been posted in the past, but I took it upon
myself to expand them and address some of the concerns and also continue the
discussion around them. I believe most people have been roped in the email
conversation about this and know what these patches are for. The first patch
(mmu: Introduce XENMEM_claim_pages (subop of memory ops) has a good blurb
about the problem/solution/alternative solutions.

The patches follow the normal code-flow - the patch to implement the two hypercalls:
XENMEM_claim_pages and XENMEM_get_outstanding_pages.

Then the patches to utilize them in the libxc. The hypercall's are only utilized
if the toolstack (libxl) sets the claim_mode to anything but zero.

Then the toolstack (libxl + xl) patches. They revolve around two different changes:
 1). Add 'claim_mode=[off|on]' global configuration value that determines
     whether the claim hypercall should be used as part of guest creation.
 2). Add an extra parameter -c to the 'xl info' to provide the output of how many
     pages are claimed by different guests. This is more of a diagnostic patch.

That is it.

 docs/man/xl.conf.pod.5         |  25 +++++++++
 tools/examples/xl.conf         |   5 ++
 tools/libxc/xc_dom.h           |   1 +
 tools/libxc/xc_dom_x86.c       |  12 +++++
 tools/libxc/xc_domain.c        |  25 +++++++++
 tools/libxc/xc_hvm_build_x86.c |  17 ++++++
 tools/libxc/xenctrl.h          |   7 +++
 tools/libxc/xenguest.h         |   2 +
 tools/libxl/libxl.c            |  18 +++++++
 tools/libxl/libxl.h            |   3 ++
 tools/libxl/libxl_dom.c        |   3 +-
 tools/libxl/libxl_types.idl    |  12 ++++-
 tools/libxl/xl.c               |   5 ++
 tools/libxl/xl.h               |   1 +
 tools/libxl/xl_cmdimpl.c       |  34 ++++++++++--
 tools/libxl/xl_cmdtable.c      |   4 +-
 tools/libxl/xl_sxp.c           |   1 +
 xen/common/domain.c            |   1 +
 xen/common/domctl.c            |   1 +
 xen/common/memory.c            |  33 ++++++++++++
 xen/common/page_alloc.c        | 116 ++++++++++++++++++++++++++++++++++++++++-
 xen/include/public/domctl.h    |   3 +-
 xen/include/public/memory.h    |  35 ++++++++++++-
 xen/include/xen/mm.h           |   3 ++
 xen/include/xen/sched.h        |   1 +
 25 files changed, 356 insertions(+), 12 deletions(-)


Dan Magenheimer (3):
      mmu: Introduce XENMEM_claim_pages (subop of memory ops).
      xc: use XENMEM_claim_pages during guest creation.
      xc: XENMEM_claim_pages outstanding claims value

Konrad Rzeszutek Wilk (3):
      xl: Implement XENMEM_claim_pages support via 'claim_mode' global config
      xl: export 'outstanding_pages' value from xcinfo
      xl: 'xl list' supports '-c' for global claim information.