[Qemu-devel] [PATCH 0/8] block: generic image streaming

[Stefan Hajnoczi]

This series adds the 'block_stream' command which copies the contents of a
backing file into the image file while the VM is running.  The series builds on
copy-on-read and zero detection features which I sent out recently and I
suggest grabbing my git tree to try it out without merging these dependencies
yourself:

http://repo.or.cz/w/qemu/stefanha.git/shortlog/refs/heads/image-streaming-api

The image streaming HMP/QMP commands are documented in the patch and also
described here:

http://wiki.qemu.org/Features/LiveBlockMigration/ImageStreamingAPI

The basic idea is to execute 'block_stream virtio0' while the guest is running.
Progress can be monitored using 'info block-jobs'.  When the streaming
operation completes it raises a QMP event.

This series includes a Python test script called test-stream.py.  When run in a
QEMU source tree it performs basic image streaming QMP tests.

TODO:
 * support 'base' argument for stream partial backing file chains
 * rate-limiting support, currently a NotSupported error is raised

My plan is to add rate-limiting shortly but the 'base' argument will require
more work later.  I'm sending these patches out to share the general direction
and let folks know what to expect as I continue to test this code.

Stefan Hajnoczi (8):
  coroutine: add co_sleep_ns() coroutine sleep function
  block: add BlockJob interface for long-running operations
  block: add image streaming block job
  qmp: add block_stream command
  qmp: add block_job_set_speed command
  qmp: add block_job_cancel command
  qmp: add query-block-jobs
  test: add image streaming test cases

 Makefile.objs          |    3 +-
 block/stream.c         |  135 ++++++++++++++++++++++++++++++++
 block_int.h            |   98 +++++++++++++++++++++++
 blockdev.c             |  183 +++++++++++++++++++++++++++++++++++++++++++
 blockdev.h             |    8 ++
 hmp-commands.hx        |   45 +++++++++++
 monitor.c              |   19 +++++
 monitor.h              |    1 +
 qemu-coroutine-sleep.c |   38 +++++++++
 qemu-coroutine.h       |    6 ++
 qerror.c               |    4 +
 qerror.h               |    3 +
 qmp-commands.hx        |  173 +++++++++++++++++++++++++++++++++++++++++
 test-stream.py         |  200 ++++++++++++++++++++++++++++++++++++++++++++++++
 trace-events           |   10 +++
 15 files changed, 925 insertions(+), 1 deletions(-)
 create mode 100644 block/stream.c
 create mode 100644 qemu-coroutine-sleep.c
 create mode 100644 test-stream.py

-- 
1.7.7