[Xen-devel] [PATCH v8] detect and initialize CDP (Code/Data Prioritization) feature

[He Chen <he.chen@xxxxxxxxxxxxxxx>]

Changes in v8:
- x86:
  * x86/psr part is not included in this version since it had been merged
    to upstream
- tools & docs:
  * fix per socekt CDP status show bug
  * fix word missing in xl-psr.markdown
  * coding style

Changes in v7:
- x86:
  * amend function find_cos and pick_avail_cos to ignore reference count
    for COS0
  * write CDP data mask (mask1) before turning CDP on
  * check CDP status before clear enabled bit in function cat_cpu_fini
  * code style
- tools & docs:
  * LIBXL_PSR_CBM_TYPE_L3_CODE (DATA) =>
    LIBXL_PSR_CBM_TYPE_L3_CBM_CODE (DATA)
  * refactor psr_cat_print_one_domain and add a helper to print different
    type CBM
  * fix docs wrap

Changes in v6:
- x86:
  * remove unnecessary parameter in cdp_is_enabled function
  * remove variable need_write and restruct code in psr_set_l3_cbm
- tools & docs:
  * separate CBM headings in the output of xl psr-cat-show
  * revert the numbers of SDM chapter in xl-psr.markdown
  * XC_PSR_CAT_L3_CODE (DATA) => XC_PSR_CAT_L3_CBM_CODE (DATA)
  * correct error message of passing -c and -d at the same time

Changes in v5:
- x86: address Andrew's and Jan's coments.
- tools: refine options parsing in psr-cat-cbm-set and invalidate passing -c
  and -d at the same time
- merge tools and docs patches.
- code style

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 v8 patch 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 (1):
  tools & docs: add tools and docs support for Intel CDP

 docs/man/xl.pod.1             | 15 ++++++++++
 docs/misc/xl-psr.markdown     | 53 ++++++++++++++++++++++++++++++++++
 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      | 67 +++++++++++++++++++++++++++++++++++--------
 tools/libxl/xl_cmdtable.c     |  2 ++
 9 files changed, 160 insertions(+), 16 deletions(-)

-- 
1.9.1


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