Re: [Qemu-devel] Spice project is now open

[Izik Eidus]

On Fri, 11 Dec 2009 20:48:28 +0200
Izik Eidus <address@hidden> wrote:

> On Fri, 11 Dec 2009 09:57:48 -0600
> Anthony Liguori <address@hidden> wrote:
> 
> > Yaniv Kamay wrote:
> > > Hi,
> > >
> > > Spice project is now open, for more information visit
> > > http://spice-space.org, due to a server relocation the site will
> > > be down during this weekend.
> > >
> > > Spice ship patched QEMU based on fairly old KVM snapshot as a
> > > reference implementation. The Spice team plane to push all the
> > > relevant bits into QEMU upstream.
> > >   
> > 
> > Historically, we have not supported multiple display mechanisms
> > favoring making one mechanism as good as it can be.
> > 
> > Supporting both Spice and VNC would go against this policy.  It's
> > not outside the realm of possibility, but there has to be a good 
> > justification for it.
> > 
> > We need to separate the advantages of having a paravirtual display 
> > driver from the advantages of a remote display protocol.  For
> > instance, VNC is capable of doing ARGB cursor offloading to the
> > client.  We do not support it in QEMU because the VGA drivers we
> > emulate do not support this functionality.  Likewise, VNC can
> > support sound tunneling and QEMU does implement this (although
> > virt-manager does not yet).
> > 
> > So from a protocol perspective, what are the advantages of Spice
> > over VNC?
> 
> 
> Spice desgien is highly diffrence than VNC
> The first thing about spice is that it isnt just a framebuffer drawing
> and not a bitmaps protocol.
> 
> Spice protocl support multiple graphics commands, multiple surfaces
> drawings, Spice is desgined to render as less as it can on the server
> and instead to render on the client side much of the work,
> To achive this spice use all kind of techniques such as depth viewing
> tree.
> 
> We already have patchs that support offscreen surfaces -> the
> architacture for high end 3d, this make things even more complicated.
> 
> Spice is a library, it is library for remote display, it handle by
> itself all the connection between the spice client to the host that
> run the guest, it include:
> sound, display, keyboard, usb, network tunneling (for printers) and so
> on...
> 

I want to add that qemu is not the sole user of spice, Spice will be
used as a protocol to connect into physical windows/linux machines....

So how can we change the library just for qemu?