[PATCH 0 of 5] xenpaging: improve page-out path

[Olaf Hering <olaf@aepfle.de>]

The following series makes mapping a gfn from foreign domains more robust. Now
that xc_mem_paging_load() takes care of the page-in path, adjust also the
page-out path. This moves the pager out of the way and all places where a p2mt
check is done can now return -ENOENT right away.

Olaf

Changes:
xenpaging: extend xc_mem_paging_enable() to handle interface version
xenpaging: map gfn before nomination
xenpaging: add need_populate and paged_no_mfn checks
xenpaging: restore p2mt if gfn is needed before evict
xenpaging: improve evict error handling

 tools/libxc/xc_mem_paging.c      |    3 +-
 tools/libxc/xenctrl.h            |    1 
 tools/xenpaging/xenpaging.c      |   49 ++++++++++++++++++++++++----------
 xen/arch/x86/hvm/emulate.c       |    3 +-
 xen/arch/x86/hvm/hvm.c           |   17 +++++++-----
 xen/arch/x86/mm.c                |   55 +++++++++++----------------------------
 xen/arch/x86/mm/guest_walk.c     |    3 +-
 xen/arch/x86/mm/hap/guest_walk.c |    6 ++--
 xen/arch/x86/mm/mem_event.c      |    9 ++++++
 xen/arch/x86/mm/p2m-ept.c        |    3 --
 xen/arch/x86/mm/p2m.c            |   33 ++++++++++++-----------
 xen/common/grant_table.c         |    3 +-
 xen/include/asm-x86/p2m.h        |    9 ++++--
 xen/include/public/mem_event.h   |    2 +
 14 files changed, 110 insertions(+), 86 deletions(-)