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Date: Fri, 24 Aug 2012 14:23:32 +0100
From: Julien Grall <julien.grall@citrix.com>
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Subject: Re: [Qemu-devel] [Xen-devel] [XEN][RFC PATCH V2 12/17] xl: Add
 interface to handle qemu disaggregation
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To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: "christian.limpach@gmail.com" <christian.limpach@gmail.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>

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.