Re: [qemu-s390x] [Qemu-devel] [PATCH] hw/s390x: Fix the function arguments in the pci stub file

[Thomas Huth]

On 2019-02-11 11:48, Cornelia Huck wrote:
> On Fri, 1 Feb 2019 09:23:56 +0100
> Cornelia Huck <address@hidden> wrote:
> 
>> On Fri, 1 Feb 2019 07:46:40 +0100
>> Thomas Huth <address@hidden> wrote:
> 
>>> So I see two options now:
>>>
>>> 1) Finally really make the device optional, at least for new machine
>>> types, so we can really disable CONFIG_PCI and get a working executable.
>>>
>>> 2) Scratch the idea completely to make this optional, always link the
>>> s390-pci-bus.o and s390-pci-inst.o files unconditionally, and remove the
>>> s390-pci-stub.c file.
>>>
>>> I assume options 2 is preferred, since we likely rather want to move
>>> into the PCI direction in the long run, instead of ignoring it...  
>>
>> I think both options are viable, but option 1 is of course more work.
>> The win there is that we could disable an entire subsystem.
>>
>> I guess that the basic questions are: How important is it that
>> subsystems can be compiled out, and do we see a use case for a pci-less
>> s390 machine in the future? We really don't want to spend much time on
>> something of dubious use...
> 
> Any thoughts on this?
> 
> I'm currently tending towards option 2 (and can cook up a patch for
> that). Unless someone is already working on option 1 :)

Since nobody currently has a need to completely disable PCI, I think we
should go with option 2.

 Thomas