Re: [Qemu-devel] [PATCH 14/17] add new RanState RAN_STATE_FLIPPING_MIGRATE

[Eric Blake <eblake@redhat.com>]

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On 10/22/2013 04:25 AM, Lei Li wrote:
> Introduce new RanState RAN_STATE_FLIPPING_MIGRATE and
> add it to runstate_needs_reset().
> 
> Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
> ---
>  qapi-schema.json |   11 +++++++----
>  vl.c             |   12 +++++++++++-
>  2 files changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 523a5b2..8178d0c 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -176,12 +176,15 @@
>  # @watchdog: the watchdog action is configured to pause and has been triggered
>  #
>  # @guest-panicked: guest has been panicked as a result of guest OS panic
> +#
> +# @flipping-migrate: guest is paused to start unix_page_flipping migration
> +# process

We probably ought to enhance the docs to mention '(since 1.8)' for this
field (and likewise for other enum values added after the original
introduction of the enum).

Last time we added a new user-visible runstate, it broke migration with
older libvirt versions that weren't prepared to see the new state (hmm,
I need to check if libvirt has fixed that in the meantime; adding a
cc...).  Paolo's advice at the time was that it is okay to require a new
libvirt when using a new qemu, and that libvirt should be taught to
treat all unknown RunState as if they were 'running'; although for this
particular addition it might be nicer to have libvirt lump 'inmigrate'
and 'flipping-migrate' to the same usage.

>  ##
>  { 'enum': 'RunState',
> -  'data': [ 'debug', 'inmigrate', 'internal-error', 'io-error', 'paused',
> -            'postmigrate', 'prelaunch', 'finish-migrate', 'restore-vm',
> -            'running', 'save-vm', 'shutdown', 'suspended', 'watchdog',
> -            'guest-panicked' ] }
> +  'data': [ 'debug', 'flipping-migrate', 'inmigrate', 'internal-error',
> +            'io-error', 'paused', 'postmigrate', 'prelaunch', 'finish-migrate',
> +            'restore-vm', 'running', 'save-vm', 'shutdown', 'suspended',
> +            'watchdog', 'guest-panicked' ] }
>  


-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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