Linux kernel 7.0 introduced PERF_PKG_MON support in resctrl filesystem
which exposes per-workload energy and performance monitoring.

This series enables per-VM energy monitoring via core_energy (Joules) and
activity (Farads) counters. Energy monitors can be configured through new
<energytune> element under <cputune> following earlier cachetune and
memorytune patterns.

Design notes:

Energy values from resctrl are floating-point. I added separate dvals/ndvals
pair to virResctrlMonitorStats to handle them. I kept them in a single
struct for easier integration with performance counters (integers and floats
within same monitor) that might be integrated in another patch.

The new XML element is <energytune> under <cputune> following earlier pattern for
resctrl features (cachetune, memorytune). Energytune doesn't currently support
the "tuning" part, only monitoring. I added it as energytune for consistency with
cache and memory features, keeping all resctrl handling under cputune. This also makes
sense with current resctrl architecture - all monitoring groups are part of an
allocation group. This approach allows for easy opt-in/out on the monitoring features.

Changes since v1 (RFC):
 - Split into 5 patches (see below)
 - Changed VIR_INFO/VIR_WARN to VIR_DEBUG
 - Tightened energyMonitorFeature to <choice> of core_energy/activity instead of regex
 - Renamed test case energytune-basic -> energytune
 - Minor comment cleanups in virresctrl.h

Jedrzej Wasiukiewicz (5):
  util: add PERF_PKG_MON energy monitoring support in virresctrl
  conf: report energy monitoring in host capabilities
  conf: add energytune to domain XML
  qemu: resctrl energy counters via domstats
  NEWS: document resctrl energy monitoring

 NEWS.rst                                  |   6 +
 docs/formatdomain.rst                     |  20 +++
 include/libvirt/libvirt-domain.h          |  65 ++++++++
 src/conf/capabilities.c                   |  42 +++++
 src/conf/capabilities.h                   |   6 +
 src/conf/domain_conf.c                    |  99 ++++++++++++
 src/conf/schemas/capability.rng           |  27 ++++
 src/conf/schemas/domaincommon.rng         |  19 +++
 src/conf/virconftypes.h                   |   2 +
 src/qemu/qemu_driver.c                    |  70 ++++++++-
 src/util/virresctrl.c                     | 180 ++++++++++++++++++----
 src/util/virresctrl.h                     |  10 +-
 tests/genericxml2xmlindata/energytune.xml |  32 ++++
 tests/genericxml2xmltest.c                |   1 +
 14 files changed, 542 insertions(+), 37 deletions(-)
 create mode 100644 tests/genericxml2xmlindata/energytune.xml

--
2.34.1
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