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Date: Mon, 10 Mar 2014 13:26:02 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 2/2] Fix return value of vga
 initlization on ppc
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To: Alexey Kardashevskiy <aik@ozlabs.ru>, Mark Wu <wudxw@linux.vnet.ibm.com>, qemu-devel@nongnu.org, qemu-ppc@nongnu.org
Cc: afaerber@suse.de, aliguori@amazon.com, Alex Graf <agraf@suse.de>

Il 10/03/2014 13:23, Alexey Kardashevskiy ha scritto:
> On 03/10/2014 05:07 AM, Paolo Bonzini wrote:
>> Il 08/03/2014 14:26, Alexey Kardashevskiy ha scritto:
>>>>> I think that after this patch, "-nodefaults -device VGA" will get a USB
>>>>> controller that it didn't get before.
>>>
>>> I suspect what was meant by "the machine not aware of the graphics device"
>>>  is that the guest won't work with VGA and without keyboard (default
>>> console will be vga + keyboard and not serial) which is USB and this is why
>>> the patch is trying to add USB.
>>
>> But with -nodefaults QEMU should never be adding USB.
>
> As I was told in this list before, even with -nodefaults, QEMU should not
> create a machine which is known for not working or not being supported.
> Having VGA and not having any input device is kind of such a config, no?

-nodefaults is exactly the opposite of that: no magic whatsoever.  No 
VGA, no serial, nothing.

And especially, with -nodefaults adding a VGA means just that: adding a VGA.

Paolo