[Qemu-devel] [PATCH V4 0/3] Block migration if any of the block device is busy

[benoit.canet@gmail.com]

From: Benoît Canet <benoit@irqsave.net>

This patchset is designed to avoid starting a live migration while any of
the block device is busy.

Tested with the following sequence:

QEMU 1.1.50 monitor - type 'help' for more information
(qemu) block_stream virtio0 1k
(qemu) migrate tcp:localhost:4444
migrate: Migration is blocked by streaming
(qemu)  block_job_cancel virtio0
(qemu)  migrate tcp:localhost:4444
migrate: Connection can not be completed immediately
(qemu) 
=> migration then succeed

in v2:
stefanha: Rename bdrv_have_block_jobs() to bdrv_are_busy() and make it return -EBUSY.
paolo: remove spurious bdrv_close()

in v3
pm215: rewrite confusing error message

in v4:
stefanha: make the error message more general

Benoît Canet (3):
  block: Add bdrv_are_busy()
  qerror: Add error telling that block dev usage prevents migration
  migration: block migration when streaming block jobs are running.

 block.c     |   13 +++++++++++++
 block.h     |    2 ++
 migration.c |    5 +++++
 qerror.c    |    4 ++++
 qerror.h    |    3 +++
 5 files changed, 27 insertions(+)

-- 
1.7.9.5