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Fri, 06 Sep 2019 22:32:29 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x86MTBXC121161; Fri, 6 Sep 2019 22:30:28 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 2uum4hqb2a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 06 Sep 2019 22:30:28 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x86MURrW017351; Fri, 6 Sep 2019 22:30:27 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 06 Sep 2019 15:30:27 -0700 Subject: Re: [PATCH] xen/pci: try to reserve MCFG areas earlier To: Igor Druzhinin , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: jgross@suse.com References: <1567556431-9809-1-git-send-email-igor.druzhinin@citrix.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <1567556431-9809-1-git-send-email-igor.druzhinin@citrix.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9372 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=961 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060222 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9372 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060222 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/3/19 8:20 PM, Igor Druzhinin wrote: > If MCFG area is not reserved in E820, Xen by default will defer its usage > until Dom0 registers it explicitly after ACPI parser recognizes it as > a reserved resource in DSDT. Having it reserved in E820 is not > mandatory according to "PCI Firmware Specification, rev 3.2" (par. 4.1.2) > and firmware is free to keep a hole E820 in that place. Xen doesn't know > what exactly is inside this hole since it lacks full ACPI view of the > platform therefore it's potentially harmful to access MCFG region > without additional checks as some machines are known to provide > inconsistent information on the size of the region. > > Now xen_mcfg_late() runs after acpi_init() which is too late as some basic > PCI enumeration starts exactly there. Trying to register a device prior > to MCFG reservation causes multiple problems with PCIe extended > capability initializations in Xen (e.g. SR-IOV VF BAR sizing). There are > no convenient hooks for us to subscribe to so try to register MCFG > areas earlier upon the first invocation of xen_add_device(). Where is MCFG parsed? pci_arch_init()? -boris > Keep the > existing initcall in case information of MCFG areas is updated later > in acpi_init(). > 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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_SANE_1 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 E51F2C43331 for ; Fri, 6 Sep 2019 22:32:51 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B3E19208C3 for ; Fri, 6 Sep 2019 22:32:51 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Fri, 06 Sep 2019 22:32:29 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x86MTBXC121161; Fri, 6 Sep 2019 22:30:28 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 2uum4hqb2a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 06 Sep 2019 22:30:28 +0000 Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x86MURrW017351; Fri, 6 Sep 2019 22:30:27 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 06 Sep 2019 15:30:27 -0700 To: Igor Druzhinin , xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org References: <1567556431-9809-1-git-send-email-igor.druzhinin@citrix.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <1567556431-9809-1-git-send-email-igor.druzhinin@citrix.com> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9372 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=961 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060222 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9372 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060222 Subject: Re: [Xen-devel] [PATCH] xen/pci: try to reserve MCFG areas earlier X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: jgross@suse.com Content-Type: text/plain; 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