Re: [libvirt] [Qemu-devel] [RFC 00/15] qmp: Report supported device types on 'query-machines'
On 11/24/2016 05:41 PM, Markus Armbruster wrote:
Marcel Apfelbaum <marcel(a)redhat.com> writes:
> On 11/24/2016 03:34 PM, Markus Armbruster wrote:
>> Eduardo Habkost <ehabkost(a)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?
Define wrong :)
Wrong enough for
QEMU to reject it?
QEMU accepts them and they even function correctly as far as I know.
Unless QEMU rejects it, there's no reason not to
list it as pluggable.
This is the gray area I can't argue. I do think that Eduardo's
work may present an opportunity to change QEMU's mantra:
"everything goes as long as it works" to "here is what this configuration
supports".
Thanks,
Marcel
> I do believe there are other examples, I'll try to think of
more.
>
> Thanks,
> Marcel
>
> [...]