From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E87BC3F2CE for ; Wed, 4 Mar 2020 21:37:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5D70021741 for ; Wed, 4 Mar 2020 21:37:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729930AbgCDVhr (ORCPT ); Wed, 4 Mar 2020 16:37:47 -0500 Received: from mga09.intel.com ([134.134.136.24]:34763 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728482AbgCDVhr (ORCPT ); Wed, 4 Mar 2020 16:37:47 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Mar 2020 13:37:46 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,515,1574150400"; d="scan'208";a="413294350" Received: from jpan9-mobl2.amr.corp.intel.com (HELO localhost) ([10.254.51.15]) by orsmga005.jf.intel.com with ESMTP; 04 Mar 2020 13:37:45 -0800 Date: Wed, 4 Mar 2020 13:37:44 -0800 From: "Jacob Pan (Jun)" To: Joerg Roedel Cc: Jean-Philippe Brucker , "Michael S. Tsirkin" , Auger Eric , , , , , , , , , jacob.jun.pan@intel.com, "Kaneda, Erik" , "Rothman, Michael A" Subject: Re: [PATCH v2 1/3] iommu/virtio: Add topology description to virtio-iommu config space Message-ID: <20200304133744.00000fdb@intel.com> In-Reply-To: <20200304174045.GC3315@8bytes.org> References: <20200228172537.377327-1-jean-philippe@linaro.org> <20200228172537.377327-2-jean-philippe@linaro.org> <20200302161611.GD7829@8bytes.org> <9004f814-2f7c-9024-3465-6f9661b97b7a@redhat.com> <20200303130155.GA13185@8bytes.org> <20200303084753-mutt-send-email-mst@kernel.org> <20200303155318.GA3954@8bytes.org> <20200303105523-mutt-send-email-mst@kernel.org> <20200304133707.GB4177@8bytes.org> <20200304153821.GE646000@myrica> <20200304174045.GC3315@8bytes.org> Organization: intel X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; i686-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Wed, 4 Mar 2020 18:40:46 +0100 Joerg Roedel 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