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

[Markus Armbruster]

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.

2. We want a way to Kconfig the PCI devices that work, i.e. only the
   ones that support MSI or MSI-X.

I don't like calling devices without any MSI capability "classic" or
"conventional devices".  I'd rather call them "MSI-capable" or
"MSI/MSI-X devices".

Since PCI-E devices must implement MSI or MSI-X, we could perhaps
configure just the PCI-E devices for s390x.  No need to invent a new
name then.  Do we even have device models that can do MSI but not E?