Re: [Xen-devel] [RFC PATCH 0/7] domain snapshot implementation

["Chun Yan Liu" <cyliu@xxxxxxxx>]

ping?

>>> On 8/11/2015 at 06:44 PM, in message
<1439289896-27849-1-git-send-email-cyliu@xxxxxxxx>, Chunyan Liu
<cyliu@xxxxxxxx> wrote: 
> Add vm snapshot implementation. Support snapshot-create and 
> snapshot-revert. 
>  
> Current Limitations: 
>  
> About disk snapshot create, there are many cases: 
>  - qdisk, internal, should calls qmp command to do the work. 
>  - qdisk, external, should calls qmp command to do the work, qemu 
>    will replace disk backend file after creating external snapshot. 
>  - nonqdisk, internal, should call 'qemu-img snapshot' to do the work. 
>  - nonqdisk, external, should call 'qemu-img create' to create a new file 
>    with the original disk file as backing file. And libxl should replace 
>    domain disk from original disk to the new file. 
>  
>  To the last case, during domain snapshot, between domain suspend and 
>  resume, how to replace the disk backend file from libxl? Especially if 
>  disk file format is changed (original disk backend file is 'raw', new file 
>  is 'qcow2')? 
>  
>  Considering this, currently I exclude the non-qdisk cases, let the API 
>  support qdisk only. About the non-qdisk and external case, any suggestion? 
>  
> About disk snapshot revert: 
>  
>  Reverting from external disk snapshot is actually starting domain from a 
>  specified backing file, since backing file should be kept read-only, that 
>  will involve block copy operation. Currently this case is not supported. 
>  
>  Only support reverting from internal disk snapshot. 
>  
> Design document: 
>  
> Latest design document is just posted. 
>  
>  
> Chunyan Liu (7): 
>   libxl_types.idl: add definitions for vm snapshot 
>   qmp: add qmp handlers to create disk snapshots 
>   libxl: save disk format to xenstore 
>   libxl: add snapshot APIs 
>   xl: add domain snapshot commands 
>   qmp: add qmp handlers to delete internal/external disk snapshot 
>   libxl: add APIs to delete internal/external disk snapshots 
>  
>  Config.mk                            |   2 +- 
>  config/Paths.mk.in                   |   1 + 
>  configure                            |   3 + 
>  docs/man/xl.snapshot.conf.pod.5      |  59 +++ 
>  m4/paths.m4                          |   3 + 
>  tools/configure                      |   3 + 
>  tools/examples/snapshot.cfg.external |   4 + 
>  tools/examples/snapshot.cfg.internal |   4 + 
>  tools/libxl/Makefile                 |   2 + 
>  tools/libxl/libxl.c                  |  10 +- 
>  tools/libxl/libxl.h                  |  51 +++ 
>  tools/libxl/libxl_internal.h         |  38 ++ 
>  tools/libxl/libxl_qmp.c              | 224 ++++++++++++ 
>  tools/libxl/libxl_snapshot.c         | 321 +++++++++++++++++ 
>  tools/libxl/libxl_types.idl          |  31 ++ 
>  tools/libxl/libxl_types_internal.idl |   8 + 
>  tools/libxl/libxl_utils.c            |  16 + 
>  tools/libxl/libxl_utils.h            |   1 + 
>  tools/libxl/xl.h                     |   2 + 
>  tools/libxl/xl_cmdimpl.c             | 677  
> +++++++++++++++++++++++++++++++++++ 
>  tools/libxl/xl_cmdtable.c            |  16 + 
>  21 files changed, 1474 insertions(+), 2 deletions(-) 
>  create mode 100644 docs/man/xl.snapshot.conf.pod.5 
>  create mode 100644 tools/examples/snapshot.cfg.external 
>  create mode 100644 tools/examples/snapshot.cfg.internal 
>  create mode 100644 tools/libxl/libxl_snapshot.c 
 



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