[Qemu-block] [PATCH v4 0/9] block: Add VFIO based driver for NVMe device

[Fam Zheng]

v4: - Rebase, address Stefan's comments.
    - Add QAPI and doc patches.

v3: Rebase, small tweaks/fixes and add locks to provide basic thread safety
    (basic because it is not really tested).

v2:
    - Implement "split vfio addr space" appraoch. [Paolo]
    - Add back 'device reset' in nvme_close(). [Paolo]
    - Better variable namings. [Stefan]
    - "Reuse" macro definitions from NVMe emulation code.
    - Rebase onto current master which has polling by default and update
      performance results accordingly.
    - Update MAINTAINERS.
    - Specify namespace in URI.
    - The sporadical I/O error from v1 "disappeared" in this version.
    - Tests one: qemu-img bench, fio, bonnie++ and installation of
      ubuntu/fedora/rhel on QEMU emulated nvme and a Intel P3700 card.

Fam Zheng (9):
  stubs: Add stubs for ram block API
  util: Introduce vfio helpers
  block: Add VFIO based NVMe driver
  block: Introduce buf register API
  block/nvme: Implement .bdrv_(un)register_buf
  qemu-img: Map bench buffer
  block: Move NVMe constants to a separate header
  docs: Add section for NVMe VFIO driver
  qapi: Add NVMe driver options to the schema

 MAINTAINERS                    |    6 +
 block/Makefile.objs            |    1 +
 block/block-backend.c          |   10 +
 block/io.c                     |   24 +
 block/nvme.c                   | 1143 ++++++++++++++++++++++++++++++++++++++++
 block/trace-events             |   21 +
 docs/qemu-block-drivers.texi   |   32 ++
 hw/block/nvme.h                |  698 +-----------------------
 include/block/block.h          |   11 +-
 include/block/block_int.h      |    9 +
 include/block/nvme.h           |  700 ++++++++++++++++++++++++
 include/qemu/vfio-helpers.h    |   30 ++
 include/sysemu/block-backend.h |    3 +
 qapi/block-core.json           |   16 +-
 qemu-img.c                     |    9 +-
 stubs/Makefile.objs            |    1 +
 stubs/ram-block.c              |   16 +
 util/Makefile.objs             |    1 +
 util/trace-events              |   11 +
 util/vfio-helpers.c            |  723 +++++++++++++++++++++++++
 20 files changed, 2765 insertions(+), 700 deletions(-)
 create mode 100644 block/nvme.c
 create mode 100644 include/block/nvme.h
 create mode 100644 include/qemu/vfio-helpers.h
 create mode 100644 stubs/ram-block.c
 create mode 100644 util/vfio-helpers.c

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2.14.3