Re: [PATCH v3 1/6] migration/tls: save hostname into MigrationState

[Daniel P . Berrangé]

On Sun, Sep 13, 2020 at 10:47:31AM +0800, Chuan Zheng wrote:
> hostname is need in multifd-tls, save hostname into MigrationState.
> 
> Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
> Signed-off-by: Yan Jin <jinyan12@huawei.com>
> ---
>  migration/channel.c   | 6 ++++++
>  migration/migration.c | 1 +
>  migration/migration.h | 5 +++++
>  3 files changed, 12 insertions(+)
> 
> diff --git a/migration/channel.c b/migration/channel.c
> index 20e4c8e..0e4104a 100644
> --- a/migration/channel.c
> +++ b/migration/channel.c
> @@ -66,6 +66,11 @@ void migration_channel_connect(MigrationState *s,
>      trace_migration_set_outgoing_channel(
>          ioc, object_get_typename(OBJECT(ioc)), hostname, error);
>  
> +    /* Save hostname into MigrationState for handshake */
> +    if (hostname) {
> +        s->hostname = g_strdup(hostname);
> +    }
> +
>      if (!error) {
>          if (s->parameters.tls_creds &&
>              *s->parameters.tls_creds &&
> @@ -90,5 +95,6 @@ void migration_channel_connect(MigrationState *s,
>          }
>      }
>      migrate_fd_connect(s, error);
> +    g_free(s->hostname);
>      error_free(error);
>  }

IIUC, this means hostname is free'd once the initial connection is
established. Don't we have to wait until all the multifd connections
exist too ?

IOW, should we be doing this somewhere in a cleanup path. Perhaps
migrate_fd_cancel() is the rigt place ?

> diff --git a/migration/migration.c b/migration/migration.c
> index 58a5452..e20b778 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -1883,6 +1883,7 @@ void migrate_init(MigrationState *s)
>      s->migration_thread_running = false;
>      error_free(s->error);
>      s->error = NULL;
> +    s->hostname = NULL;
>  
>      migrate_set_state(&s->state, MIGRATION_STATUS_NONE, 
> MIGRATION_STATUS_SETUP);
>  
> diff --git a/migration/migration.h b/migration/migration.h
> index bdc7450..bc96322 100644
> --- a/migration/migration.h
> +++ b/migration/migration.h
> @@ -259,6 +259,11 @@ struct MigrationState
>       * (which is in 4M chunk).
>       */
>      uint8_t clear_bitmap_shift;
> +
> +    /*
> +     * This save hostname when out-going migration starts
> +     */
> +    char *hostname;
>  };
>  
>  void migrate_set_state(int *state, int old_state, int new_state);
> -- 
> 1.8.3.1
> 

Regards,
Daniel
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