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diff --git a/content.tex b/content.tex index 4bf5b1e..4c98774 100644 --- a/content.tex +++ b/content.tex @@ -127,6 +127,13 @@ which was not offered. The device SHOULD accept any valid subset of features the driver accepts, otherwise it MUST fail to set the FEATURES_OK \field{device status} bit when the driver writes it. +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. + \subsection{Legacy Interface: A Note on Feature Bits}\label{sec:Basic Facilities of a Virtio Device / Feature Bits / Legacy Interface: A Note on Feature Bits} |