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

Sat, 10 Jun 2023 19:08:27 -0700 


> From: Michael S. Tsirkin <[email protected]>
> 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.


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