On Tue, Jun 11 2024, Parav Pandit parav@nvidia.com wrote:

Hi Viresh,

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From: Viresh Kumar viresh.kumar@linaro.org Sent: Tuesday, June 11, 2024 11:06 AM

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diff --git a/content.tex b/content.tex index 0a62dce5f65f..e2a836327818 100644 --- a/content.tex +++ b/content.tex @@ -631,8 +631,86 @@ \section{Device Cleanup}\label{sec:General Initialization And Device Operation /

\chapter{Virtio Transport Options}\label{sec:Virtio Transport Options}

-Virtio can use various different buses, thus the standard is split -into virtio general and bus-specific sections. +Devices and drivers can use different transport methods to enable +interaction, for example PCI, MMIO, or Channel I/O. The transport +methods define various aspects of the communication between the device +and the driver, like device discovery, exchanging capabilities, +interrupt handling, data transfer, etc. For example, in a host/guest +architecture, the host might expose a device to the guest on a PCI bus, +and the guest will use a PCI-specific driver to interact with it.

+The standard contains sections describing the transport-agnostic parts +of virtio, and sections describing how individual transports implement +virtio.

+\section{Virtio Transport Requirements}\label{sec:Virtio Transport +Options / Virtio Transport Requirements}

+There are some mechanisms that any transport is required to implement, +and some requirements that devices and drivers are required to follow.

+\subsection{Transport Requirements}\label{sec:Virtio Transport Options +/ Virtio Transport Requirements / Transport Requirements}

+A transport provides a mechanism for the driver to discover the device.

I would like to add a normative.

A transport MAY provide a mechanism to create and destroy virtio devices.

(for example PCI transport provides this).

I'm not a fan of that statement: the transport already allows for the driver to discover a device, whether that happens statically or dynamically really is the choice of the transport, and I don't think we should go into that much detail.

[I'll go offline now, so please don't expect further responses from me right now...]