Expose hypervisor, logical processor, partition, and virtual processor
statistics via debugfs. These are provided by mapping 'stats' pages via
hypercall.

Patch #1: Update hv_call_map_stats_page() to return success when
          HV_STATS_AREA_PARENT is unavailable, which is the case on some
          hypervisor versions, where it can fall back to HV_STATS_AREA_SELF
Patch #2: Introduce the definitions needed for the various stats pages
Patch #3: Add mshv_debugfs.c, and integrate it with the mshv_root driver to
          expose the partition and VP stats.

---
Changes in v2:
- Remove unnecessary pr_debug_once() in patch 1 [Stanislav Kinsburskii]
- CONFIG_X86 -> CONFIG_X86_64 in patch 2 [Stanislav Kinsburskii]

---
Nuno Das Neves (2):
  mshv: Add definitions for stats pages
  mshv: Add debugfs to view hypervisor statistics

Purna Pavan Chandra Aekkaladevi (1):
  mshv: Ignore second stats page map result failure

 drivers/hv/Makefile            |    1 +
 drivers/hv/mshv_debugfs.c      | 1122 ++++++++++++++++++++++++++++++++
 drivers/hv/mshv_root.h         |   34 +
 drivers/hv/mshv_root_hv_call.c |   41 +-
 drivers/hv/mshv_root_main.c    |   52 +-
 include/hyperv/hvhdk.h         |  437 +++++++++++++
 6 files changed, 1662 insertions(+), 25 deletions(-)
 create mode 100644 drivers/hv/mshv_debugfs.c

-- 
2.34.1