[virtio-dev] Re: [virtio-comment] Re: [PATCH 09/11] transport-pci: Describe PCI MMR dev config registers

Michael S. Tsirkin
2023-04-14T07:05:26Z

On Fri, Apr 14, 2023 at 03:51:01AM +0000, Parav Pandit wrote:
>
>
> > From: Jason Wang <jasowang@redhat.com>
> > Sent: Thursday, April 13, 2023 11:38 PM
>
> > > > 1) spec doesn't enforce the size of a specific structure
> > > Spec will be extended in coming time.
> >
> > It's too late to do any new restriction without introducing a flag.
> We are really diverging from the topic.
> I don’t think it is late. The work in this area of PCI VF has not even begun fully.

I think Jason means that any new feature needs some kind of approach for
compatibility, given a huge installed base, a flag day where all old
drivers stop working on new devices does not look acceptable to him.

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MST