[PATCH 0/4] hw/block/nvme: Implement ZNS finish-zone ZDC AEN

[<clay.mayers@kioxia.com>]

From: Clay Mayers <clay.mayers@kioxia.com>

ZNS controllers have the option to limit the time a zone can remain in
the active state.  It begins with a background process in the controller
setting the finish-zone-recommended FZR attribute for a zone.  As part of
setting this attribute, the zone's id is added to the namespace's
zone-descriptor-changed (ZDC) log page. If enabled, items added to the
ZDC log page generate a ZDC "asynchronous event notification" AEN. Optionally,
the control can induce a "zone excursion" forcing the zone into the finished
state that also generates a ZDC event.

Zone enabled applications need to properly handle ZDC events. In a real device,
the timeout is many hours making testing an application difficult.
Implemented is the generation of FZR ZDC events to speed up O/S and application
testing.

Added to the zoned NVMe command set is an optional, per-namespace timer
(zoned.finish_time) to set the FZR attr for long-lived active zones; A per
namespace ZDC log page; AEN results to including CQE.DW1 (the NSID of the ZDC
AEN) and generating a ZDC AEN if it's been enabled. Zone excursions are not
modeled.

See section 5.5 of the NVMe Zoned Namespace Command Set Specification v1.1
for more details.

Clay Mayers (4):
  hw/block/nvme: add ZONE_FINISH_RECOMMENDED functionality
  hw/block/nvme: add zone descriptor changed log page
  hw/block/nvme: supply dw1 for aen result
  hw/block/nvme: add zone descriptor changed AEN

 docs/system/devices/nvme.rst |   5 ++
 hw/nvme/ctrl.c               | 166 +++++++++++++++++++++++++++++++++--
 hw/nvme/ns.c                 |  15 ++++
 hw/nvme/nvme.h               |  37 +++++++-
 hw/nvme/trace-events         |   3 +-
 include/block/nvme.h         |  14 ++-
 6 files changed, 225 insertions(+), 15 deletions(-)

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2.27.0