Commit dc15541d authored by Stefan Hajnoczi's avatar Stefan Hajnoczi
Browse files

block: add block_set_io_throttle virtio-blk-pci QMP example 



The block_set_io_throttle command can look up BlockBackends by the
attached qdev device ID.  virtio-blk-pci is a special case because the
actual VirtIOBlock device is the "/virtio-backend" child of the PCI
adapter device.

Add a QMP schema example so clients will know how to use
block_set_io_throttle on the virtio-blk-pci device.

The alternative is to implement some sort of aliasing for qmp_get_blk()
but that is likely to cause confusion and could break future use cases.
Let's not go there.

Cc: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarAlberto Garcia <berto@igalia.com>
Message-id: 20180117090700.25811-1-stefanha@redhat.com
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent b384cd95

qapi/block-core.json

+18 −0
Original line number Diff line number Diff line
@@ -1799,6 +1799,24 @@ 
# Example:

#

# -> { "execute": "block_set_io_throttle",

#      "arguments": { "id": "virtio-blk-pci0/virtio-backend",

#                     "bps": 0,

#                     "bps_rd": 0,

#                     "bps_wr": 0,

#                     "iops": 512,

#                     "iops_rd": 0,

#                     "iops_wr": 0,

#                     "bps_max": 0,

#                     "bps_rd_max": 0,

#                     "bps_wr_max": 0,

#                     "iops_max": 0,

#                     "iops_rd_max": 0,

#                     "iops_wr_max": 0,

#                     "bps_max_length": 0,

#                     "iops_size": 0 } }

# <- { "return": {} }

#

# -> { "execute": "block_set_io_throttle",

#      "arguments": { "id": "ide0-1-0",

#                     "bps": 1000000,

#                     "bps_rd": 0,