[Xen-devel] [PATCH v2 0/6] Allow setting up shared memory areas between VMs from xl config files

[Zhongze Liu <blackskygg@xxxxxxxxx>]

This series implements the new xl config entry proposed in [1]. Users can use
the new config entry to statically setup shared memory areas among VMs that
don't have grant table support so that they could communicate with each other
through the static shared memory areas.

[1] Proposla to allow setting up shared memory areas between VMs from xl config 
file:
  https://lists.xen.org/archives/html/xen-devel/2017-08/msg03242.html

v2:
  * fixed several code style issues.
  * introduce MMU__SHARE_MEM in flask av permissions, and add a check to this.
    permission in the flask hook for xsm_map_gmfn_foreign.
  * support rolling back during creation on partial failure.
  * refcounting the sshm path instead of using "alive" and "zombie" to label the
    master and counting the slaves.

Cheers,

Zhongze Liu (6):
  libxc: add xc_domain_remove_from_physmap to wrap
    XENMEM_remove_from_physmap
  libxl: introduce a new structure to represent static shared memory
    regions
  libxl:xl: add parsing code to parse "libxl_static_sshm" from xl config
    files
  xsm: flask: change the dummy xsm policy and flask hook for
    map_gmfn_foregin
  libxl: support mapping static shared memory areas during domain
    creation
  libxl: support unmapping static shared memory areas during domain
    destruction

 tools/flask/policy/modules/xen.if   |   2 +
 tools/libxc/include/xenctrl.h       |   4 +
 tools/libxc/xc_domain.c             |  11 +
 tools/libxl/Makefile                |   4 +-
 tools/libxl/libxl.h                 |   4 +
 tools/libxl/libxl_arch.h            |   6 +
 tools/libxl/libxl_arm.c             |  15 ++
 tools/libxl/libxl_create.c          |  27 ++
 tools/libxl/libxl_domain.c          |   5 +
 tools/libxl/libxl_internal.h        |  15 ++
 tools/libxl/libxl_sshm.c            | 480 ++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl_types.idl         |  34 ++-
 tools/libxl/libxl_x86.c             |  18 ++
 tools/libxl/libxlu_sshm.c           | 210 ++++++++++++++++
 tools/libxl/libxlutil.h             |   6 +
 tools/xl/xl_parse.c                 |  24 +-
 xen/arch/arm/mm.c                   |   2 +-
 xen/arch/x86/mm/p2m.c               |   2 +-
 xen/include/xsm/dummy.h             |   8 +-
 xen/include/xsm/xsm.h               |   7 +-
 xen/xsm/flask/hooks.c               |  10 +-
 xen/xsm/flask/policy/access_vectors |   4 +
 22 files changed, 883 insertions(+), 15 deletions(-)
 create mode 100644 tools/libxl/libxl_sshm.c
 create mode 100644 tools/libxl/libxlu_sshm.c

-- 
2.14.0


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