Re: [Qemu-devel] [PATCH 3/6] qmp: Add "alias-of" field to query-cpu-definitions

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, Jun 25, 2019 at 02:00:05AM -0300, Eduardo Habkost wrote:
> Management software will be expected to resolve CPU model name
> aliases using the new field.
> 
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
> Cc: Eric Blake <eblake@redhat.com>
> Cc: Markus Armbruster <armbru@redhat.com>
> ---
>  qapi/target.json | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/qapi/target.json b/qapi/target.json
> index 1d4d54b600..0197c7962c 100644
> --- a/qapi/target.json
> +++ b/qapi/target.json
> @@ -475,6 +475,12 @@
>  #            to introspect properties configurable using -cpu or -global.
>  #            (since 2.9)
>  #
> +# @alias-of: Name of CPU model this model is an alias for.  The target of the
> +#            CPU model alias may change depending on the machine type.
> +#            Management software is supposed to translate CPU model aliases
> +#            in the VM configuration, because aliases may stop being
> +#            migration-safe in the future (since 4.1)
> +#
>  # @unavailable-features is a list of QOM property names that
>  # represent CPU model attributes that prevent the CPU from running.
>  # If the QOM property is read-only, that means there's no known
> @@ -498,7 +504,8 @@
>              '*migration-safe': 'bool',
>              'static': 'bool',
>              '*unavailable-features': [ 'str' ],
> -            'typename': 'str' },
> +            'typename': 'str',
> +            '*alias-of' : 'str' },
>    'if': 'defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_I386) || defined(TARGET_S390X) || defined(TARGET_MIPS)' }

IIUC, this means that data for a "Haswell" CPU model will now report
"alias-of": "Haswell-NNN"  (for some arbitrary NNN which may change
at will in any release).


Regards,
Daniel
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