[Qemu-devel] [PATCH 0/4 V6] char: Add CirMemCharDriver and provide QMP interface

[Lei Li <lilei@linux.vnet.ibm.com>]

This patch series attempts to add new char backend CirMemCharDriver with
a circular buffer and expose it to users by introducing QMP interface
memchar-write and memchar-read and via the command line like the other
CharDriverStates.

Serial ports in qemu always use CharDriverStates as there backends,
Right now, all of our backends always try to write the data from the
guest to a socket or file. The concern from OpenStack is that this could
lead to unbounded disk space usage since they log the serial output.
For more detail of the background info:
https://bugs.launchpad.net/nova/+bug/832507

So we want to use a circular buffer in QEMU instead, and then OpenStack
can periodically read the buffer in QEMU and log it.

The QMP commands introduced like:

{ 'command': 'memchar-write',
  'data': {'chardev': 'str', 'size': 'int', 'data': 'str',
           'format': 'str' } }

{ 'command': 'memchar-read',
  'data': {'chardev': 'str', 'size': 'int', 'format': 'str' },
  'returns': 'str' }

Expose CirMemCharDriver via the command line like:

qemu -chardev memchr,id=foo,maxcapacity=640k -serial chardev:foo

Introduce HMP command 'console' like:

(qemu) console foo
foo: Input data

Note:
Now all of the feature were implemented, and the pervious comments
are fixed up too. Please comment and let me know if there is anything
else need to be improved. Your suggestion would be very appreciated!

Changes since v5:
  - Avoid writing the IAC information to the queue.
  - Grammar of the doc for command line options improved from Eric.

Changes since v4:
  - Get rid of all CongestionControl bits, and assume a dropping behavior
    based on Luiz's suggestion for now. Will add it when we add async
    support to QMP.
  - Squashed the patches about CirMemCharDriver in one.
  - Other fixups from Luiz.

Changes since v3:
  - Improve the algorithm of circular buffer based on Anthony's
    suggestion.
  - Some changes suggested by Luiz and Blue.
  - And other fixups.

Changes since v2:
  - Add congestion mechanism. For the 'block' option as sync command,
    will support it later when we gain the necessary infrastructure
    enhancement.
  - Add HMP 'console' command so that can interact with multiple
    chardevs via a single monitor socket.
  - Make the circular buffer backend and the current MemCharDriver
    live in parallel, expose a new char backend with circular buffer
    CirMemCharDriver suggested by Luiz.
  - Other fixs from Eric and Markus.

Changes since v1:
  - Exposing the MemCharDriver via command line.
  - Support base64 data format suggested by Anthony and Eric.
  - Follow the new rule for the name of qmp command from Eric.


Lei Li (4):
  qemu-char: Add new char backend CirMemCharDriver
  QAPI: Introduce memchar-write QMP command
  QAPI: Introduce memchar-read QMP command
  HMP: Introduce console command

 hmp-commands.hx  |   72 +++++++++++++++++++
 hmp.c            |   99 +++++++++++++++++++++++
 hmp.h            |    3 +
 monitor.c        |   15 ++++
 monitor.h        |    3 +
 qapi-schema.json |   96 +++++++++++++++++++++++++
 qemu-char.c      |  217 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 qemu-config.c    |    3 +
 qemu-options.hx  |   10 +++
 qmp-commands.hx  |   89 +++++++++++++++++++++
 10 files changed, 607 insertions(+), 0 deletions(-)