Re: [Qemu-devel] [Xen-devel] [XEN][RFC PATCH V2 12/17] xl: Add interface to handle qemu disaggregation

[Julien Grall]

On 08/24/2012 02:03 PM, Ian Campbell wrote:
> > > > @@ -246,6 +246,20 @@ libxl_domain_sched_params = Struct("domain_sched_params",[
> > > >        ("extratime",    integer, {'init_val': 
> > > > 'LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT'}),
> > > >        ])
> > > >
> > > > +libxl_dm_cap = Enumeration("dm_cap", [
> > > > +    (1, "UI"), # Emulate all UI + default device
> > > >
> > > >          
> > > What does "default device" equate too?
> > >
> > >        
> > The following devices:
> >      - i440fx
> >      - piix3
> >      - piix4
> >      - dma
> >      - xen apic
> >      - xen platform
> >      
> So this is more like "CORE" than "UI"?
>
> Is there a reason why UI (which I guess means the VGA, spice and VFB
> devices?) are required to be in the same emulator as these?
>
>    

VGA, keyboard and mouse (that can be plug via USB) need
to be in the same emulator. Otherwise we can't use VNC or
something like that.

I made this choice, after discussion with Stefano, because
theses devices depends each others. For instance, keyboard
emulates A20.