[Xen-devel] [PATCH v4 0/4] detect and initialize CDP (Code/Data Prioritization) feature

[He Chen <he.chen@xxxxxxxxxxxxxxx>]

Changes in v4:
- x86:
  * remove union member name in struct `psr_cat_cbm` (suggested by Jan)
  * fix log info of CAT & CDP (suggested by Chao & Jan)
  * add a helper `cdp_is_enabled` to tell the status of CDP and CDP initialize
    failed is considered (Jan's comment)
  * XEN_SYSCTL_INTERFACE_VERSION 0x0000000C -> 0x0000000D (suggested by Jan)
  * refine CBM type check logic in get/set CBM function (suggested by Jan)
  * loop optimization in function `find_cos` (suggested by Jan)
- tools: Address Chao's comments.
- docs: Address Chao's comments.
- code style

Changes in v3:
- x86: remove redundant CDP field in cat_socket_enable (suggested by Chao)
- tools: simplify CBM setting function in tools (suggested by Jan)
- docs: Add boot parameter description (suggested by Chao & Ian)
- code style

Changes in v2:
- x86: Enable CDP by boot parameter instead of enabling/disabling CDP at
       runtime (suggested by Andrew)
- tools: remove psr-cat-cdp-enable/disable xl commands
- code style

Code/Data Prioritization(CDP) is offered in Intel Broadwell and later server
platforms, which is an extension of CAT. CDP enables isolation and separate
prioritization of code and data fetches to the L3 cache in a software
configurable manner, which can enable workload prioritization and tuning of
cache capacity to the characteristics of the workload. CDP extends Cache
Allocation Technology (CAT) by providing separate code and data capacity bit
masks(CBM) per Class of Service (COS). CDP is used on VM basis in the Xen
implementation.

More information about CDP, please refer to Intel SDM, Volumn 3, section 17.16
http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-manual-325462.pdf

This patch series enables CDP feature in Xen based on CAT code, and extends
CBM operation functions to support CDP. For all the changes, please see in
each patch.

This v4 patchset has been tested on Intel Broadwell server platform.

To make this patchset better, any comment or suggestion is welcomed, I would
really appreciate it.

Thanks

He Chen (4):
  x86: Support enable CDP by boot parameter and add get CDP status
  x86: add domctl cmd to set/get CDP code/data CBM
  tools: add tools support for Intel CDP
  docs: add document to introduce CDP command

 docs/man/xl.pod.1                   |  14 +++
 docs/misc/xen-command-line.markdown |  11 +-
 docs/misc/xl-psr.markdown           |  44 ++++++-
 tools/libxc/include/xenctrl.h       |   7 +-
 tools/libxc/xc_psr.c                |  17 ++-
 tools/libxl/libxl.h                 |   7 ++
 tools/libxl/libxl_psr.c             |   5 +-
 tools/libxl/libxl_types.idl         |   3 +
 tools/libxl/xl_cmdimpl.c            |  49 ++++++--
 tools/libxl/xl_cmdtable.c           |   3 +
 xen/arch/x86/domctl.c               |  32 ++++-
 xen/arch/x86/psr.c                  | 239 +++++++++++++++++++++++++++++-------
 xen/arch/x86/sysctl.c               |   5 +-
 xen/include/asm-x86/msr-index.h     |   3 +
 xen/include/asm-x86/psr.h           |  23 +++-
 xen/include/public/domctl.h         |   4 +
 xen/include/public/sysctl.h         |   4 +-
 17 files changed, 395 insertions(+), 75 deletions(-)

-- 
1.9.1


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