[PATCH v3 0/3] qapi/ui: change vnc addresses

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Hi all!

v3: - instead of creating new qmp command add an argument to existing
      display-reload
    - also don't touch websockets for now. I'm not sure we need it.
      Additional argument for changing websockets may be added later on
      demand

Recently our customer requested a possibility to change VNC listen port
dynamically.

Happily in Rhel7-based Qemu we already have this possibility: through
deprecated "change" qmp command.

But since 6.0 "change" qmp command was removed, with recommendation to
use change-vnc-password or blockdev-change-medium instead. Of course,
neither of them allow change VNC listen port.

So, let's reimplement the possibility.

Note: now, reconnecting may trigger existing deadlock, as I described
in my message "Re: [PULL 09/11] ui/vnc: clipboard support":
 <973ddebe-14a9-4ba7-c389-7a97d6017237@virtuozzo.com>

Simple hack helps, but I'm not sure it's safe itself:

    diff --git a/ui/vnc.c b/ui/vnc.c
    index 69bbf3b6f6..8c6b378e2e 100644
    --- a/ui/vnc.c
    +++ b/ui/vnc.c
    @@ -1354,12 +1354,12 @@ void vnc_disconnect_finish(VncState *vs)
             /* last client gone */
             vnc_update_server_surface(vs->vd);
         }
    +    vnc_unlock_output(vs);
    +
         if (vs->cbpeer.update.notify) {
             qemu_clipboard_peer_unregister(&vs->cbpeer);
         }
     
    -    vnc_unlock_output(vs);
    -
         qemu_mutex_destroy(&vs->output_mutex);
         if (vs->bh != NULL) {
             qemu_bh_delete(vs->bh);

Vladimir Sementsov-Ogievskiy (3):
  ui/vnc: refactor arrays of addresses to SocketAddressList
  qapi/ui: display-reload: add possibility to change listen address
  avocado/vnc: add test_change_listen

 docs/about/removed-features.rst |   3 +-
 qapi/ui.json                    |   6 +-
 include/ui/console.h            |   2 +-
 monitor/qmp-cmds.c              |   4 +-
 ui/vnc.c                        | 166 ++++++++++++++++----------------
 tests/avocado/vnc.py            |  10 ++
 6 files changed, 100 insertions(+), 91 deletions(-)

-- 
2.31.1