[libvirt] [Qemu-devel] [RFC 00/15] qmp: Report supported device types on 'query-machines'

[Markus Armbruster]

Marcel Apfelbaum <marcel at redhat.com> writes:

> On 11/24/2016 03:34 PM, Markus Armbruster wrote:
>> Eduardo Habkost <ehabkost at redhat.com> writes:
>>
>>> On Wed, Nov 23, 2016 at 06:43:16PM +0200, Marcel Apfelbaum wrote:
>>>> On 11/22/2016 03:11 AM, Eduardo Habkost wrote:
>>>>> The Problem
>>>
>
> [...]
>
>> Our decision to have hybrid PCI/PCIe devices and buses breeds
>> considerable complexity.  I wish we had avoided them, but I believe it's
>> too late to change now.
>>
>>>> This still does not solve the problem that some devices makes
>>>> sense only on a specific arch.
>>
>
> Hi Markus,
>
>> Examples?
>>
>
> One quick example would be that we don't want to see
> Intel's IOH 3420 PCIe Root Port in an ARM machine,
> or a pxb on a Q35 machine (in this case we want pxb-pcie)

Such a device would be weird.  But would it be wrong?  Wrong enough for
QEMU to reject it?  Unless QEMU rejects it, there's no reason not to
list it as pluggable.

> I do believe there are other examples, I'll try to think of more.
>
> Thanks,
> Marcel
>
> [...]