Re: [PATCH v2 1/3] shared-mem: introduce page alignment restrictions

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Mar 31, 2025 at 11:05:46AM -0400, Sergio Lopez wrote:
> Add a subsection for page alignment restrictions.
> 
> Signed-off-by: Sergio Lopez <slp@redhat.com>
> ---
>  shared-mem.tex | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/shared-mem.tex b/shared-mem.tex
> index 6e6f6c4..2021083 100644
> --- a/shared-mem.tex
> +++ b/shared-mem.tex
> @@ -34,6 +34,12 @@ \subsection{Addressing within regions}\label{sec:Basic Facilities of a Virtio De
>  The \field{shmid} may be explicit or may be inferred from the
>  context of the reference.
>  
> +\subsection{Page alignment restrictions}\label{sec:Basic Facilities of a Virtio Device / Shared Memory Regions / Page alignment restrictions}
> +
> +When requesting the device to map memory into a shared memory region
> +the driver MUST obtain the page size information from the transport
> +and honor the page alignment constrains derived from that page size.
> +

will make existing drivers autmatically incompliant with new devices.

we generally avoid things like this.

>  \devicenormative{\subsection}{Shared Memory Regions}{Basic Facilities of a Virtio
>  Device / Shared Memory Regions}
>  Shared memory regions MUST NOT expose shared memory regions which
> -- 
> 2.49.0