Re: [Qemu-devel] [PATCH spice-server 00/13] semi-seamless migration v2 (RHBZ #738266, 725009)

[Alon Levy <alevy@redhat.com>]

On Wed, Sep 21, 2011 at 06:51:10PM +0300, Yonit Halperin wrote:
> same as the previous version with the following changes:
> 

Reviewed-by: Alon Levy <alevy@redhat.com>

Looks good.

> (1) I'm sending only the spice-server patches. I will send the client fixes later.
>     (and then I will move the "Release 0.8.3" patch to the head).
> (2) migration interface changes:
>     * spice_server_migrate_connect was added.
>       It is called on client_migrate_info cmd, if spice-server is new (instead of spice_server_migrate_info).
>     * migrate_end_complete callback was added to the migration interface.
>       In case we will need it for future seamless migration implementation
>     * bump release to 0.8.3
> (3) fall back to the switch host scheme in case of client failure to connect the target
> (4) fix accessing the wrong ticket in the target side (legacy from old seamless migration code)
> (5) fix not calling to migrate_connect_complete callback when no client is connected 
> 
> 
> reminder:
> 
> Here is a summary of the new migration scheme (copied from the commit msg of the first patch)
>     
>     migration source side
>     ---------------------
>     (1) spice_server_migrate_connect (*): tell client to link
>         to the target side - send SPICE_MSG_MAIN_MIGRATE_BEGIN.
>         It will be called on client_migrate_info cmd. client_migrate_info is asynchronous.
>     (2) Complete client_migrate_info only when the client has been connected
>         to the target - wait for SPICE_MSGC_MAIN_MIGRATE_(CONNECTED|CONNECT_ERROR) or a timeout.
>     (3) spice_server_migrate_end: tell client migration it can switch to the target - send
>         SPICE_MSG_MAIN_MIGRATE_END.
>     (4) client cleans up all data related to the connection to the source and switches to the target.
>         It sends SPICE_MSGC_MAIN_MIGRATE_END.
>     
>     migration target side
>     ---------------------
>     (1) the server identifies itself as a migraiton target since the client is linked with (connection_id != 0)
>     (2) server doesn't start the channels' logic (channel->link) till it receives SPICE_MSGC_MAIN_MIGRATE_END
>         from the client.
>     
>     *   After migration starts, the target qemu is blocked and cannot accept new spice client
>         connections. Thus, we trigger the connection to the target upon client_migrate_info
>         command.
> 
> Yonit Halperin (13):
>   server/spice.h: semi-seamless migration interface, RHBZ #738266
>   server: handle migration interface addition
>   configure: spice-protocol >= 0.8.2 (semi-seamless migration protocol)
>   server,proto: tell the client to connect to the migration target
>     before migraton starts
>   spice.proto: add SPICE_MSG_MAIN_MIGRATE_END &
>     SPICE_MSGC_MAIN_MIGRATE_END
>   server: send SPICE_MSG_MAIN_MIGRATE_END on spice_server_migrate_end
>   server: move SPICE_MSG_MAIN_INIT sending code to a separate routine
>   server: move the linking of channels to a separate routine
>   server: handling semi-seamless migration in the target side
>   server: call migrate_connect_complete callback when no client is
>     connected
>   server: turn spice_server_migrate_start into a valid call
>   server: fall back to switch host scheme in case semi-seamless
>     connection to target fails
>   Release 0.8.3
> 
>  NEWS                        |    7 +
>  common/messages.h           |    2 +
>  configure.ac                |    4 +-
>  server/reds.c               |  545 +++++++++++++++++++++++++++++++++----------
>  server/reds.h               |    4 +
>  server/spice-experimental.h |    3 -
>  server/spice-server.syms    |    4 +
>  server/spice.h              |   29 +++-
>  spice.proto                 |    9 +-
>  9 files changed, 474 insertions(+), 133 deletions(-)
> 
> -- 
> 1.7.4.4
>