RE: [PATCH V2 0/4] hw/block/nvme: Implement ZNS finish-zone ZDC AEN

[Clay Mayers <Clay.Mayers@kioxia.com>]

> From:  clay.mayers@kioxia.com
> Sent: Friday, October 21, 2022 4:11 PM
> To: qemu-devel@nongnu.org
> Cc: Keith Busch <kbusch@kernel.org>; Klaus Jensen <its@irrelevant.dk>; Fam
> Zheng <fam@euphon.net>; Phlippe Mathieu-Daudé <f4bug@amsat.org>
> Subject: [PATCH V2 0/4] hw/block/nvme: Implement ZNS finish-zone ZDC AEN
> 
> 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.
> 
> Changes since v1
> - Fixed offset length checking in zdc log page
> - Moved zdc_event_queued to the patch 4
> - Unwatched zdc events in nvme_exit()
> 
> 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               | 174 +++++++++++++++++++++++++++++++++--
>  hw/nvme/ns.c                 |  15 +++
>  hw/nvme/nvme.h               |  37 +++++++-
>  hw/nvme/trace-events         |   3 +-
>  include/block/nvme.h         |  14 ++-
>  6 files changed, 233 insertions(+), 15 deletions(-)
> 
> --
> 2.27.0

I forgot to add Dmitry to the CC list for v2