This patch adds zoned storage emulation to the virtio-blk driver. It
implements the virtio-blk ZBD support standardization that is
recently accepted by virtio-spec. The link to related commit is at

https://github.com/oasis-tcs/virtio-spec/commit/b4e8efa0fa6c8d844328090ad15db65af8d7d981

The Linux zoned device code that implemented by Dmitry Fomichev has been
released at the latest Linux version v6.3-rc1.

Aside: adding zoned=on alike options to virtio-blk device will be
considered in following-up plan.

v11:
- drop update virtio-blk header patch
- fix CI issues [Stefan]

v10:
- adapt to the latest zone-append patches: rename bs->bl.wps to bs->wps

v9:
- address review comments
  * add docs for zoned emulation use case [Matias]
  * add the zoned feature bit to qmp monitor [Matias]
  * add the version number for newly added configs of accounting [Markus]

v8:
- address Stefan's review comments
  * rm aio_context_acquire/release in handle_req
  * rename function return type
  * rename BLOCK_ACCT_APPEND to BLOCK_ACCT_ZONE_APPEND for clarity

v7:
- update headers to v6.3-rc1

v6:
- address Stefan's review comments
  * add accounting for zone append operation
  * fix in_iov usage in handle_request, error handling and typos

v5:
- address Stefan's review comments
  * restore the way writing zone append result to buffer
  * fix error checking case and other errands

v4:
- change the way writing zone append request result to buffer
- change zone state, zone type value of virtio_blk_zone_descriptor
- add trace events for new zone APIs

v3:
- use qemuio_from_buffer to write status bit [Stefan]
- avoid using req->elem directly [Stefan]
- fix error checkings and memory leak [Stefan]

v2:
- change units of emulated zone op coresponding to block layer APIs
- modify error checking cases [Stefan, Damien]

v1:
- add zoned storage emulation

Sam Li (4):
  virtio-blk: add zoned storage emulation for zoned devices
  block: add accounting for zone append operation
  virtio-blk: add some trace events for zoned emulation
  docs/zoned-storage:add zoned emulation use case

 block/qapi-sysemu.c          |  11 +
 block/qapi.c                 |  18 ++
 docs/devel/zoned-storage.rst |  17 ++
 hw/block/trace-events        |   7 +
 hw/block/virtio-blk-common.c |   2 +
 hw/block/virtio-blk.c        | 405 +++++++++++++++++++++++++++++++++++
 hw/virtio/virtio-qmp.c       |   2 +
 include/block/accounting.h   |   1 +
 qapi/block-core.json         |  68 +++++-
 qapi/block.json              |   4 +
 tests/qemu-iotests/227.out   |  18 ++
 11 files changed, 542 insertions(+), 11 deletions(-)

-- 
2.40.0