vnc: remove vnc_display global

Replace with a vnc_displays list, so we can have multiple vnc server
instances.  Add vnc_server_find function to lookup a display by id.
With no id supplied return the first vnc server, for backward
compatibility reasons.

It is not possible (yet) to actually create multiple vnc server
instances.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/ui/vnc.h b/ui/vnc.h
index 334de9ddb1..6fe8278126 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -171,6 +171,8 @@ struct VncDisplay
     struct VncSurface guest;   /* guest visible surface (aka ds->surface) */
     pixman_image_t *server;    /* vnc server surface */
 
+    const char *id;
+    QTAILQ_ENTRY(VncDisplay) next;
     char *display;
     char *password;
     time_t expires;