Re: [Qemu-devel] [PATCH 01/12] chardev: ringbuf: add optional save parameter to save state

[Eric Blake]

On 06/19/2013 09:40 PM, Anthony Liguori wrote:
> It is very useful to use the ringbuf chardev for writing test
> cases and even more useful if the state of the ringbuf is migrated
> with the guest.  Otherwise it's hard to detect data loss in a test
> case.
> 
> Signed-off-by: Anthony Liguori <address@hidden>
> ---
>  qapi-schema.json |  3 ++-
>  qemu-char.c      | 45 +++++++++++++++++++++++++++++++++++++++++++--
>  2 files changed, 45 insertions(+), 3 deletions(-)
> 
> diff --git a/qapi-schema.json b/qapi-schema.json
> index a80ee40..90602d1 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -3280,10 +3280,11 @@
>  # Configuration info for memory chardevs
>  #
>  # @size: #optional Ringbuffer size, must be power of two, default is 65536
> +# @save: #optional Register a savevm handler, default false

Useful to have a '(since 1.6)' notation on the added field.

>  #
>  # Since: 1.5
>  ##
> -{ 'type': 'ChardevMemory', 'data': { '*size'  : 'int' } }
> +{ 'type': 'ChardevMemory', 'data': { '*size'  : 'int', '*save': 'bool' } }

Yet another case for introspection discovering an added feature to an
existing command.

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

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