[Qemu-block] [PATCH v2 0/5] virtio-blk: add DISCARD and WRITE ZEROES features

[Stefano Garzarella]

This series adds the support of DISCARD and WRITE ZEROES commands
and extends the virtio-blk-test to test WRITE_ZEROES command when
the feature is enabled.

v2:
- added patch 1 to use virtio_blk_handle_rw_error() with discard operation
- added patch 2 to make those new features machine-type dependent (thanks David)
- fixed patch 3 (previously patch 1/2) adding more checks, block_acct_start()
                for WRITE_ZEROES requests, and configurable parameters to
                initialize the limits (max_sectors, wzeroes_may_unmap).
                (thanks Stefan)
                I moved in a new function the code to handle a single segment,
                in order to simplify the support of multiple segments in the
                future.
- added patch 4 to change the assert on data_size following the discussion with
                Thomas, Changpeng, Michael, and Stefan (thanks all)
- fixed patch 5 (previously patch 2/2) using local dwz_hdr variable instead of
                dynamic allocation (thanks Thomas)

This series requires the new virtio headers from linux v5.0-rc1
already imported by Paolo:

Based-on: <address@hidden>

Thanks,
Stefano

Stefano Garzarella (5):
  virtio-blk: add acct_failed param to virtio_blk_handle_rw_error()
  virtio-blk: add "discard-wzeroes" boolean property
  virtio-blk: add DISCARD and WRITE ZEROES features
  tests/virtio-blk: change assert on data_size in virtio_blk_request()
  tests/virtio-blk: add test for WRITE_ZEROES command

 hw/block/virtio-blk.c          | 185 ++++++++++++++++++++++++++++++++-
 hw/core/machine.c              |   1 +
 include/hw/virtio/virtio-blk.h |   3 +
 tests/virtio-blk-test.c        |  75 ++++++++++++-
 4 files changed, 259 insertions(+), 5 deletions(-)

-- 
2.20.1