Re: [Qemu-devel] [PATCH for-2.10 07/10] migration: Clean up around tls_creds, tls_hostname

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Markus Armbruster (armbru@redhat.com) wrote:
> Optional MigrationParameters members tls_creds and tls_hostname can't
> actually be absent outside qmp_migrate_set_parameters() since commit
> 4af245d (v2.9.0).
> 
> Note that commit 4af245d reverted the part of commit de63ab6 (v2.8.0)
> that made tls_creds and tls_hostname absent instead of "" in the value
> of query-migrate-parameters, even though commit de63ab6 called that a
> mistake.  What a mess.
> 
> Drop the redundant tests for presence, and update documentation.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  hmp.c                 |  6 ++++--
>  migration/migration.c |  4 ++--
>  qapi-schema.json      | 11 +++++------
>  3 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/hmp.c b/hmp.c
> index 2993586..2b2db3c 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -313,12 +313,14 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
>          monitor_printf(mon, "%s: %" PRId64 "\n",
>              MigrationParameter_lookup[MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT],
>              params->cpu_throttle_increment);
> +        assert(params->has_tls_creds);
>          monitor_printf(mon, "%s: '%s'\n",
>              MigrationParameter_lookup[MIGRATION_PARAMETER_TLS_CREDS],
> -            params->has_tls_creds ? params->tls_creds : "");
> +            params->tls_creds);
> +        assert(params->has_tls_hostname);
>          monitor_printf(mon, "%s: '%s'\n",
>              MigrationParameter_lookup[MIGRATION_PARAMETER_TLS_HOSTNAME],
> -            params->has_tls_hostname ? params->tls_hostname : "");
> +            params->tls_hostname);
>          assert(params->has_max_bandwidth);
>          monitor_printf(mon, "%s: %" PRId64 " bytes/second\n",
>              MigrationParameter_lookup[MIGRATION_PARAMETER_MAX_BANDWIDTH],
> diff --git a/migration/migration.c b/migration/migration.c
> index a0db40d..bae9808 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -438,9 +438,9 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
>      params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
>      params->has_cpu_throttle_increment = true;
>      params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
> -    params->has_tls_creds = !!s->parameters.tls_creds;
> +    params->has_tls_creds = true;
>      params->tls_creds = g_strdup(s->parameters.tls_creds);
> -    params->has_tls_hostname = !!s->parameters.tls_hostname;
> +    params->has_tls_hostname = true;
>      params->tls_hostname = g_strdup(s->parameters.tls_hostname);
>      params->has_max_bandwidth = true;
>      params->max_bandwidth = s->parameters.max_bandwidth;
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 485767f..7b75cf1 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -1054,9 +1054,7 @@
>  # @MigrationParameters:
>  #
>  # Optional members can be omitted on input ('migrate-set-parameters')
> -# but most members will always be present on output
> -# ('query-migrate-parameters'), with the exception of tls-creds and
> -# tls-hostname.
> +# but members will always be present on output.
>  #
>  # @compress-level: compression level
>  #
> @@ -1077,10 +1075,10 @@
>  #             channel. On the outgoing side of the migration, the credentials
>  #             must be for a 'client' endpoint, while for the incoming side the
>  #             credentials must be for a 'server' endpoint. Setting this
> -#             will enable TLS for all migrations. The default is unset,
> -#             resulting in unsecured migration at the QEMU level. (Since 2.7)
> +#             to a non-empty string enables TLS for all migrations.
>  #             An empty string means that QEMU will use plain text mode for
> -#             migration, rather than TLS (Since 2.9)
> +#             migration, rather than TLS (Since 2.7)
> +#             Note: 2.8 reports this by omitting tls-creds instead.
>  #
>  # @tls-hostname: hostname of the target host for the migration. This
>  #                is required when using x509 based TLS credentials and the
> @@ -1090,6 +1088,7 @@
>  #                certificate identity can be validated. (Since 2.7)
>  #                An empty string means that QEMU will use the hostname
>  #                associated with the migration URI, if any. (Since 2.9)
> +#                Note: 2.8 reports this by omitting tls-hostname instead.
>  #
>  # @max-bandwidth: to set maximum speed for migration. maximum speed in
>  #                 bytes per second. (Since 2.8)
> -- 
> 2.7.5
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK