On Mon, Aug 14, 2023 at 7:29 PM Zhu Lingshan <[email protected]> wrote:
>
> This commit specifies the actions to be taken by the device upon
> SUSPEND.
>
> Signed-off-by: Jason Wang <[email protected]>
> Signed-off-by: Eugenio PÃrez <[email protected]>
> Signed-off-by: Zhu Lingshan <[email protected]>
> ---
> content.tex | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/content.tex b/content.tex
> index 074f43e..43bd5de 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -96,6 +96,15 @@ \section{\field{Device Status} Field}\label{sec:Basic
> Facilities of a Virtio Dev
> If VIRTIO_F_SUSPEND is negotiated and SUSPEND is set, the device MUST clear
> SUSPEND
> and resumes operation upon DRIVER_OK.
>
> +If VIRTIO_F_SUSPEND is negotiated, when SUSPEND is set, the device MUST
> perform the following operations:
> +\begin{itemize}
> +\item Stop comsuming any descriptors
Typo.
> +\item Mark all finished descriptors as used and send used buffer
> notification to the driver
What happens to the unfinished descriptors?
> +\item Record Virtqueue State of each enabled virtqueue, see section
> \ref{sec:Virtqueues / Virtqueue State}
This basically means those states are only available after suspending
or not? It would be still useful for debugging if we allow it without
suspending.
> +\item Pause its operation and preserve all configurations in its Device
> Configuration Space, see \ref{sec:Basic Facilities of a Virtio Device /
> Device Configuration Space}
We probably need to define the "pause" here (e.g what happens to the
inflight descriptors).
Thanks
> +\item Present SUSPEND in \field{device status}
> +\end{itemize}
> +
> \section{Feature Bits}\label{sec:Basic Facilities of a Virtio Device /
> Feature Bits}
>
> Each virtio device offers all the features it understands. During
> --
> 2.35.3
>
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