Re: [Qemu-devel] [PATCH 0/3] client_migrate_switch and auto_switch (RHBZ 725009)

[Gerd Hoffmann]

  Hi,

> > Ok, so I think we should be able to fix the race outlined above
> > without adding new monitor commands, just by letting libvirt set the
> > spice ticket in stage 2.
>
> Is that different then what I suggested in my reply to Daniel's 5 stage outline?

I think we have to care to not mix up switch-host and seamless spice 
client migration, your reply seems to refer top some seamless spice 
migration implementation ideas.

Today we seem to have this workflow:

   (1)  migration src->dst (stage 3)
   (2a) libvirt sets spice ticket at dst (not sure which stage)
   (2b) spice client switches connection to dst

2a and 2b are racing here.  I think we can fix the race by doing this 
instead:

  (1) libvirt sets spice ticket at dst (stage 2)
  (2) migration src->dst (stage 3)
  (3) spice client switches connection to dst

cheers,
  Gerd