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
