Re: [Qemu-devel] [Spice-devel] seamless migration with spice

[Alon Levy]

On Mon, Mar 12, 2012 at 01:44:47PM +0100, Gerd Hoffmann wrote:
> On 03/12/12 12:45, Alon Levy wrote:
> > On Mon, Mar 12, 2012 at 12:34:42PM +0100, Gerd Hoffmann wrote:
> >> On 03/12/12 12:29, Alon Levy wrote:
> >>>
> >>> Actually the agent protocol does extend nicely to multiple clients - I
> >>> forgot the name but there is an additional wrapper between the
> >>> client/server originating message and the guest received message, that
> >>> is currently used for server or client originating messages, and can be
> >>> reused to have multiple in flight different client messages.
> >>
> >> I think you'll have issues in the layer above though.  Two spice clients
> >> doing cut+paste operations at the same time?  Two spice clients
> >> requesting different screen resolutions?
> > 
> > Yeah, you're right of course, this needs to be dealt with somehow.
> >  cut+paste: maps nicely to a number of different buffers. Would need
> >  some policy, and the session agent becomes closer to a buffer manager.
> >  resolutions: again policy, perhaps have a master client, or if none
> >  defined let the last or just the first choose. Not sure.
> > 
> > But these issues don't need to be solved now, do they?
> 
> Surely not.  But better keep it in mind when figuring how to handle
> migration, so we are prepared to xfer all needed state in case we
> implement that some day.
> 
> How does multi-client handle this today?

Just a single agent iirc. Or perhaps it breaks..

> 
> cheers,
>   Gerd
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