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Date: Sat, 12 Dec 2009 21:48:58 +0200
From: Izik Eidus <ieidus@redhat.com>
Subject: Re: [Qemu-devel] Re: Spice project is now open
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org

On Sat, 12 Dec 2009 13:26:30 -0600
Anthony Liguori <anthony@codemonkey.ws> wrote:

> Izik Eidus wrote:
> > On Sat, 12 Dec 2009 11:40:21 -0600
> > Anthony Liguori <anthony@codemonkey.ws> wrote:
> >
> >   
> >> FWIW, I don't see any reason why Spice couldn't be made to be
> >> separate from guest emulation.  I think it would just require the
> >> right interfacing in qemu.  I think that's purely an implementation
> >> detail.
> >>     
> >
> > The QXL device is one of the core compoments of spice..., how can
> > you separate it from the guest visible state? (it is pci device)
> >   
> 
> How does live migration work then?  Do you have to query libspice for 
> it's state?  Does it return an opaque blob?  How can it integrate
> with VMState since libspice doesn't have any knowledge of something
> like VMState?

QXL transfer the device states by itself using qemu migration
mechanisem.

The spice server just need that the pci memory (and the qxl ram/rom
state) will be migrate. (From the point of view of guest visible state)

All this guest visible states are transfered by the qxl device using
qemu.

> 
> Regards,
> 
> Anthony Liguori
>