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[RFC,v2,0/8] hw/block/nvme: metadata and end-to-end data protection support

Message ID 20210207214940.281889-1-its@irrelevant.dk (mailing list archive)
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Series hw/block/nvme: metadata and end-to-end data protection support | expand

Message

Klaus Jensen Feb. 7, 2021, 9:49 p.m. UTC 
From: Klaus Jensen <k.jensen@samsung.com>

This is RFC v2 of a series that adds support for metadata and end-to-end
data protection.

First, on the subject of metadata, in v1, support was restricted to
extended logical blocks, which was pretty trivial to implement, but
required special initialization and broke DULBE. In v2, metadata is
always stored continuously at the end of the underlying block device.
This has the advantage of not breaking DULBE since the data blocks
remains aligned and allows bdrv_block_status to be used to determinate
allocation status. It comes at the expense of complicating the extended
LBA emulation, but on the other hand it also gains support for metadata
transfered as a separate buffer.

The end-to-end data protection support blew up in terms of required
changes. This is due to the fact that a bunch of new commands has been
added to the device since v1 (zone append, compare, copy), and they all
require various special handling for protection information. If
potential reviewers would like it split up into multiple patches, each
adding pi support to one command, shout out.

The core of the series (metadata and eedp) is preceeded by a set of
patches that refactors mapping (yes, again) and tries to deal with the
qsg/iov duality mess (maybe also again?).

Support fro metadata and end-to-end data protection is all joint work
with Gollu Appalanaidu.

Klaus Jensen (8):
  hw/block/nvme: remove redundant len member in compare context
  hw/block/nvme: remove block accounting for write zeroes
  hw/block/nvme: fix strerror printing
  hw/block/nvme: try to deal with the iov/qsg duality
  hw/block/nvme: remove the req dependency in map functions
  hw/block/nvme: refactor nvme_dma
  hw/block/nvme: add metadata support
  hw/block/nvme: end-to-end data protection

 hw/block/nvme-ns.h    |   41 +-
 hw/block/nvme.h       |   44 +-
 include/block/nvme.h  |   26 +-
 hw/block/nvme-ns.c    |   29 +-
 hw/block/nvme.c       | 1687 +++++++++++++++++++++++++++++++++++------
 hw/block/trace-events |   19 +-
 6 files changed, 1574 insertions(+), 272 deletions(-)