Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 2/2] Fix return value of vga initlization on ppc

[Alexey Kardashevskiy]

On 03/10/2014 11:26 PM, Paolo Bonzini wrote:
> 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.


qemu-system-x86_64 -enable-kvm -nographic -nodefaults -monitor stdio

"info qtree" shows a whole bunch of devices like "i440FX-pcihost",
"isa-fdc", "piix3-ide", "vmmouse", "vmport" (what are the last two?). I was
told here that 8042 is to emulate A20, ok, but others - I do not really
understand. "q35" is bit different than "pc" but not smaller. The point was
made that there is no point in emulating a machine which does not exist in
the real world. Has it changed recently?


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

Usual issue - libvirt expects keyboard with VGA and x86 provides this as it
always has keyboard. PPC does not have such default.


-- 
Alexey