Re: [Qemu-arm] [Qemu-devel] [qemu-s390x] [RFC PATCH 1/3] hw/Kconfig: PCI bus implies PCI_DEVICES

[Paolo Bonzini]

On 17/07/19 14:59, Collin Walling wrote:
> On 7/16/19 11:04 AM, Thomas Huth wrote:
>> On 16/07/2019 15.06, Markus Armbruster wrote:
>>> Paolo Bonzini <address@hidden> writes:
>>>
>>>> On 15/07/19 18:12, Cornelia Huck wrote:
>>>>>> Is it INTx vs. MSI vs. MSI-X?
>>>>>
>>>>> I think for s390x we need (INTx || MSI) vs MSI-X...
>>>>
>>>> I think MSI vs MSI-X is just how it's configured, not the actual
>>>> behavior, so it should be irrelevant.
>>>
>>> My best guesses from confusing information, please correct
>>> misunderstandings:
>>>
>>> 1. PCI devices need to support MSI or MSI-X to work with s390x.
>>
>> I think Cornelia mentioned that we might even require MSI-X there ...
>> Collin (being listed as "S390 PCI" maintainer), can you confirm?
> 
> MSI-X is mandatory for PCI devices in the s390 architecture.

How are MSI and MSI-X distinguished?

Paolo