[PATCH 0 of 5] Memory event interface improvements

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

In this patch series we improve the management of congestion in the memory
events ring. We ensure no guest events are lost, even in the face of unbounded
flooding from foreign maps, or balloon.

Also, we enable resumption of mem events via an event channel kick from
user-space to Xen. This is more light-weight and scalable than the current
domctl interface, and allows for batching as well.

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

 xen/common/memory.c             |   29 +++++-
 xen/arch/x86/hvm/hvm.c          |   20 ++-
 xen/arch/x86/mm/mem_event.c     |  205 ++++++++++++++++++++++++++++++---------
 xen/arch/x86/mm/mem_sharing.c   |   27 +++-
 xen/arch/x86/mm/p2m.c           |  104 ++++++++++---------
 xen/common/memory.c             |    7 +-
 xen/include/asm-x86/mem_event.h |   16 ++-
 xen/include/asm-x86/p2m.h       |    6 +-
 xen/include/xen/mm.h            |    2 +
 xen/include/xen/sched.h         |    5 +-
 xen/arch/ia64/vmx/vmx_init.c    |    2 +-
 xen/arch/x86/hvm/hvm.c          |    7 +-
 xen/arch/x86/mm/mem_event.c     |    3 +-
 xen/common/event_channel.c      |   75 +++++++++++---
 xen/include/xen/event.h         |    5 +-
 xen/include/xen/sched.h         |    2 +-
 xen/arch/x86/mm/mem_access.c    |    3 +-
 xen/arch/x86/mm/p2m.c           |    3 +-
 xen/include/asm-x86/p2m.h       |    2 +-
 xen/arch/x86/mm/mem_event.c     |   26 +++-
 20 files changed, 389 insertions(+), 160 deletions(-)