Re: [Qemu-devel] [PATCH 1/6] Allow multiple monitor devices (v2)

[Avi Kivity]

Anthony Liguori wrote:
> Hollis Blanchard wrote:
> > On Wed, 2009-04-08 at 13:34 -0500, Anthony Liguori wrote:
> >  
> > > Right now only one monitor device can be enabled at a time.  In 
> > > order to support
> > > asynchronous notification of events, I would like to introduce a 
> > > 'wait' command
> > > that waits for an event to occur.  This implies that we need an 
> > > additional
> > > monitor session to allow commands to still be executed while waiting 
> > > for an
> > > asynchronous notification.
> > >     
> >
> > Was there any consensus reached in this thread? I'm once again looking
> > for ways to communicate qemu watchdog events to libvirt.
> >   
>
> We can do multiple monitors as a debugging tool, but to support 
> events, a proper machine monitor mode is a prerequisite.
>
> The real requirement is that events are obtainable via a single 
> communication channel instead of requiring two separate communication 
> channels.  Internal implementation will look at lot like these patches.
>
> The reasoning for requiring a single channel is that coordinating 
> between the two channels is expected to be prohibitively difficult.  
> To have a single channel, we need a machine mode.  It cannot be done 
> in a human readable fashion.
>
> I think this summarizes the consensus we reached.  I don't agree fully 
> with the above but I'm okay with it.

If you don't agree with it, it isn't a consensus.

> Would you agree Avi?

It represents my views fairly accurately.  I'm not convinced that you 
can't to event notifications without machine mode, but on the other hand 
I do think introducing machine mode and layering notifications on top of 
that is the best way to proceed, so I can't complain.

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