Re: [PATCH v2 1/3] iommu/virtio: Add topology description to virtio-iommu config space

["Jacob Pan (Jun)" <jacob.jun.pan@intel.com>]

On Wed, 4 Mar 2020 18:40:46 +0100
Joerg Roedel <joro@8bytes.org> wrote:

> On Wed, Mar 04, 2020 at 04:38:21PM +0100, Jean-Philippe Brucker wrote:
> > I agree with this. The problem is I don't know how to get a new
> > ACPI table or change an existing one. It needs to go through the
> > UEFI forum in order to be accepted, and I don't have any weight
> > there. I've been trying to get the tiny change into IORT for ages.
> > I haven't been given any convincing reason against it or offered
> > any alternative, it's just stalled. The topology description
> > introduced here wasn't my first choice either but unless someone
> > can help finding another way into ACPI, I don't have a better
> > idea.  
> 
> A quote from the ACPI Specification (Version 6.3, Section 5.2.6,
> Page 119):
> 
> 	Table signatures will be reserved by the ACPI promoters and
> 	posted independently of this specification in ACPI errata and
> 	clarification documents on the ACPI web site. Requests to
> 	reserve a 4-byte alphanumeric table signature should be sent
> to the email address info@acpi.info and should include the purpose
> 	of the table and reference URL to a document that describes
> the table format. Tables defined outside of the ACPI specification
> 	may define data value encodings in either little endian or big
> 	endian format. For the purpose of clarity, external table
> 	definition documents should include the endian-ness of their
> 	data value encodings.
> 
> So it sounds like you need to specifiy the table format and send a
> request to info@acpi.info to get a table signature for it.
> 
+ Mike and Erik who work closely on UEFI and ACPICA.

Copy paste Erik's initial response below on how to get a new table,
seems to confirm with the process you stated above.

"Fairly easy. You reserve a 4-letter symbol by sending a message
requesting to reserve the signature to Mike or the ASWG mailing list or
info@acpi.info

There is also another option. You can have ASWG own this new table so
that not one entity or company owns the new table."

> Regards,
> 
> 	Joerg