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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 DCD7FC04AB5 for ; Thu, 6 Jun 2019 16:21:57 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B5CE320693 for ; Thu, 6 Jun 2019 16:21:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B5CE320693 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:34874 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYv9I-0001VZ-Fw for qemu-devel@archiver.kernel.org; Thu, 06 Jun 2019 12:21:56 -0400 Received: from eggs.gnu.org ([209.51.188.92]:54102) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hYv8U-00011Q-22 for qemu-devel@nongnu.org; Thu, 06 Jun 2019 12:21:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hYv8H-0004Ad-9K for qemu-devel@nongnu.org; Thu, 06 Jun 2019 12:21:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45170) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hYv84-0001ah-5t for qemu-devel@nongnu.org; Thu, 06 Jun 2019 12:20:41 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C2AFF3DE10; Thu, 6 Jun 2019 16:19:52 +0000 (UTC) Received: from paraplu.localdomain (ovpn-116-19.ams2.redhat.com [10.36.116.19]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DBE1116907; Thu, 6 Jun 2019 16:19:45 +0000 (UTC) Received: by paraplu.localdomain (Postfix, from userid 1001) id 08F133E0029; Thu, 6 Jun 2019 18:19:44 +0200 (CEST) Date: Thu, 6 Jun 2019 18:19:43 +0200 From: Kashyap Chamarthy To: qemu-devel@nongnu.org Message-ID: <20190606161943.GA9657@paraplu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.11.3 (2019-02-01) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Thu, 06 Jun 2019 16:19:52 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] PCI(e): Documentation "io-reserve" and related properties? X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi folks, Today I learnt about some obscure PCIe-related properties, in context of the adding PCIe root ports to a guest, namely: io-reserve mem-reserve bus-reserve pref32-reserve pref64-reserve Unfortunately, the commit[*] that added them provided no documentation whatsover. In my scenario, I was specifically wondering about what does "io-reserve" mean, in what context to use it, etc. (But documentation about other properties is also welcome.) Anyone more well-versed in this area care to shed some light? [*] 6755e618d0 (hw/pci: add PCI resource reserve capability to legacy PCI bridge, 2018-08-21) -- /kashyap