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Subject: Re: [virtio-comment] Re: [virtio-dev] Re: [PATCH v3 0/3] transport-pci: Introduce legacy registers access using AQ
On Sun, Jun 11, 2023 at 02:08:07AM +0000, Parav Pandit wrote: > > > > From: Michael S. Tsirkin <mst@redhat.com> > > Sent: Saturday, June 10, 2023 8:27 PM > > > > Interesting this actually violates a spec recommendation: > > > > If a device has successfully negotiated a set of features > > at least once (by accepting the FEATURES_OK \field{device > > status} bit during device initialization), then it SHOULD > > NOT fail re-negotiation of the same set of features after > > a device or system reset. Failure to do so would interfere > > with resuming from suspend and error recovery. > > > This is how we have seen mlx5 device and it has evolved now to break free such limitation. It's not conformant to that statement then :( It's a SHOULD which means if you know exactly what you are doing, there could be exceptions. In this case it's a SHOULD because it was added after 1.0 and we did not find a way to negotiate this requirement since it's the feature negotiation itself. -- MST
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