Re: [virtio-comment] [PATCH RFC v2] clarify device reset

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Cornelia Huck (cohuck@redhat.com) wrote:
> Properly specify that the method for the driver to request a
> device reset is transport specific, and some action the device
> has to take.
> 
> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
> ---
> 
> RFC -> RFC v2:
>   - moved reset spec to basic facilities
> 
> ---
>  conformance.tex |  1 +
>  content.tex     | 13 +++++++++++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/conformance.tex b/conformance.tex
> index eb3324053080..3be499ae3c5e 100644
> --- a/conformance.tex
> +++ b/conformance.tex
> @@ -271,6 +271,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets}
>  \begin{itemize}
>  \item \ref{devicenormative:Basic Facilities of a Virtio Device / Device Status Field}
>  \item \ref{devicenormative:Basic Facilities of a Virtio Device / Feature Bits}
> +\item \ref{devicenormative:Basic Facilities of a Virtio Device / Device Reset}
>  \item \ref{devicenormative:Basic Facilities of a Virtio Device / Device Configuration Space}
>  \item \ref{devicenormative:Basic Facilities of a Virtio Device / Message Framing}
>  \item \ref{devicenormative:Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table}
> diff --git a/content.tex b/content.tex
> index 620c0e28c9a7..782ddf3ed78d 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -193,6 +193,19 @@ \section{Notifications}\label{sec:Basic Facilities of a Virtio Device
>  terminology. Occasionally, the term event is used to refer to
>  a notification or a receipt of a notification.
>  
> +\section{Device Reset}\label{sec:Basic Facilities of a Virtio Device / Device Reset}
> +
> +The driver may initiate a device reset at various times; notably, during
> +device initialization and device cleanup.
> +
> +The mechanism used by the driver to initiate the reset is transport specific.
> +
> +\devicenormative{\subsection}{Device Reset}{Basic Facilities of a Virtio Device / Device Reset}
> +
> +A device MUST reinitialize device status to 0 after receiving a reset.
> +
> +A device MUST NOT send notifications after receiving a reset.
> +

This feels like a bit of a race in the description;  a Device may have
just sent a notification at the point that it receives a reset.
When a driver initiates a reset, how does the driver know that the
device has received it?

Dave

>  \section{Device Configuration Space}\label{sec:Basic Facilities of a Virtio Device / Device Configuration Space}
>  
>  Device configuration space is generally used for rarely-changing or
> -- 
> 2.26.2
> 
> 
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-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK


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