RE: [virtio-comment] Re: [virtio-dev] Re: [PATCH v3 0/3] transport-pci: Introduce legacy registers access using AQ

[Parav Pandit <parav@nvidia.com>]

> 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.

> Nothing is tied to admin queue here btw - it's using admin commands.

Sure.  It is admin command, presently using AQ. May be some other transport tomorrow.