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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 34FA4C49ED9 for ; Tue, 10 Sep 2019 21:20:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E6EE32171F for ; Tue, 10 Sep 2019 21:20:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="hAhbaJBA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726017AbfIJVUN (ORCPT ); Tue, 10 Sep 2019 17:20:13 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:36126 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725832AbfIJVUN (ORCPT ); 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Tue, 10 Sep 2019 21:19:59 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8ALDmCb184572; Tue, 10 Sep 2019 21:19:58 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 2uxk0sh7tu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 10 Sep 2019 21:19:58 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x8ALJuw2031843; Tue, 10 Sep 2019 21:19:57 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 10 Sep 2019 14:19:56 -0700 Subject: Re: [Xen-devel] [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> <5054ad91-5b87-652c-873a-b31758948bd7@oracle.com> <43b7da04-5c42-80d8-898b-470ee1c91ed2@oracle.com> <1695c88d-e5ad-1854-cdef-3cd95c812574@oracle.com> <4d3bf854-51de-99e4-9a40-a64c581bdd10@citrix.com> <43e492ff-f967-7218-65c4-d16581fabea3@oracle.com> <416ff4b7-3186-f61a-75fa-bcfc968f8117@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: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9376 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909100203 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9376 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=1015 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-1909100203 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/10/19 4:36 PM, Igor Druzhinin wrote: > On 10/09/2019 18:48, Boris Ostrovsky wrote: >> On 9/10/19 5:46 AM, Igor Druzhinin wrote: >>> On 10/09/2019 02:47, Boris Ostrovsky wrote: >>>> On 9/9/19 5:48 PM, Igor Druzhinin wrote: >>>>> On 09/09/2019 20:19, Boris Ostrovsky wrote: >>>>> >>>>>> The other question I have is why you think it's worth keeping >>>>>> xen_mcfg_late() as a late initcall. How could MCFG info be updated >>>>>> between acpi_init() and late_initcalls being run? I'd think it can only >>>>>> happen when a new device is hotplugged. >>>>>> >>>>> It was a precaution against setup_mcfg_map() calls that might add new >>>>> areas that are not in MCFG table but for some reason have _CBA method. >>>>> It's obviously a "firmware is broken" scenario so I don't have strong >>>>> feelings to keep it here. Will prefer to remove in v2 if you want. >>>> Isn't setup_mcfg_map() called before the first xen_add_device() which is where you are calling xen_mcfg_late()? >>>> >>> setup_mcfg_map() calls are done in order of root bus discovery which >>> happens *after* the previous root bus has been enumerated. So the order >>> is: call setup_mcfg_map() for root bus 0, find that >>> pci_mmcfg_late_init() has finished MCFG area registration, perform PCI >>> enumeration of bus 0, call xen_add_device() for every device there, call >>> setup_mcfg_map() for root bus X, etc. >> Ah, yes. Multiple busses. >> >> If that's the case then why don't we need to call xen_mcfg_late() for >> the first device on each bus? >> > Ideally, yes - we'd like to call it for every bus discovered. But boot > time buses are already in MCFG (otherwise system boot might not simply > work as Jan pointed out) so it's not strictly required. The only case is > a potential PCI bus hot-plug but I'm not sure it actually works in > practice and we certainly didn't support it before. It might be solved > theoretically by subscribing to acpi_bus_type that is available after > acpi_init(). OK. Then *I think* we can drop late_initcall() but I would really like to hear when others think. -boris 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=-2.3 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 DBC56C49ED9 for ; Tue, 10 Sep 2019 21:20:23 +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 A64D1216F4 for ; Tue, 10 Sep 2019 21:20:23 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Tue, 10 Sep 2019 21:19:59 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8ALDmCb184572; Tue, 10 Sep 2019 21:19:58 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 2uxk0sh7tu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 10 Sep 2019 21:19:58 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x8ALJuw2031843; Tue, 10 Sep 2019 21:19:57 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 10 Sep 2019 14:19:56 -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> <5054ad91-5b87-652c-873a-b31758948bd7@oracle.com> <43b7da04-5c42-80d8-898b-470ee1c91ed2@oracle.com> <1695c88d-e5ad-1854-cdef-3cd95c812574@oracle.com> <4d3bf854-51de-99e4-9a40-a64c581bdd10@citrix.com> <43e492ff-f967-7218-65c4-d16581fabea3@oracle.com> <416ff4b7-3186-f61a-75fa-bcfc968f8117@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: Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9376 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909100203 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9376 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=1015 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-1909100203 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; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" T24gOS8xMC8xOSA0OjM2IFBNLCBJZ29yIERydXpoaW5pbiB3cm90ZToKPiBPbiAxMC8wOS8yMDE5 IDE4OjQ4LCBCb3JpcyBPc3Ryb3Zza3kgd3JvdGU6Cj4+IE9uIDkvMTAvMTkgNTo0NiBBTSwgSWdv ciBEcnV6aGluaW4gd3JvdGU6Cj4+PiBPbiAxMC8wOS8yMDE5IDAyOjQ3LCBCb3JpcyBPc3Ryb3Zz a3kgd3JvdGU6Cj4+Pj4gT24gOS85LzE5IDU6NDggUE0sIElnb3IgRHJ1emhpbmluIHdyb3RlOgo+ Pj4+PiBPbiAwOS8wOS8yMDE5IDIwOjE5LCBCb3JpcyBPc3Ryb3Zza3kgd3JvdGU6Cj4+Pj4+Cj4+ Pj4+PiBUaGUgb3RoZXIgcXVlc3Rpb24gSSBoYXZlIGlzIHdoeSB5b3UgdGhpbmsgaXQncyB3b3J0 aCBrZWVwaW5nCj4+Pj4+PiB4ZW5fbWNmZ19sYXRlKCkgYXMgYSBsYXRlIGluaXRjYWxsLiBIb3cg Y291bGQgTUNGRyBpbmZvIGJlIHVwZGF0ZWQKPj4+Pj4+IGJldHdlZW4gYWNwaV9pbml0KCkgYW5k IGxhdGVfaW5pdGNhbGxzIGJlaW5nIHJ1bj8gSSdkIHRoaW5rIGl0IGNhbiBvbmx5Cj4+Pj4+PiBo YXBwZW4gd2hlbiBhIG5ldyBkZXZpY2UgaXMgaG90cGx1Z2dlZC4KPj4+Pj4+Cj4+Pj4+IEl0IHdh cyBhIHByZWNhdXRpb24gYWdhaW5zdCBzZXR1cF9tY2ZnX21hcCgpIGNhbGxzIHRoYXQgbWlnaHQg YWRkIG5ldwo+Pj4+PiBhcmVhcyB0aGF0IGFyZSBub3QgaW4gTUNGRyB0YWJsZSBidXQgZm9yIHNv bWUgcmVhc29uIGhhdmUgX0NCQSBtZXRob2QuCj4+Pj4+IEl0J3Mgb2J2aW91c2x5IGEgImZpcm13 YXJlIGlzIGJyb2tlbiIgc2NlbmFyaW8gc28gSSBkb24ndCBoYXZlIHN0cm9uZwo+Pj4+PiBmZWVs aW5ncyB0byBrZWVwIGl0IGhlcmUuIFdpbGwgcHJlZmVyIHRvIHJlbW92ZSBpbiB2MiBpZiB5b3Ug d2FudC4KPj4+PiBJc24ndCBzZXR1cF9tY2ZnX21hcCgpIGNhbGxlZCBiZWZvcmUgdGhlIGZpcnN0 IHhlbl9hZGRfZGV2aWNlKCkgd2hpY2ggaXMgd2hlcmUgeW91IGFyZSBjYWxsaW5nIHhlbl9tY2Zn X2xhdGUoKT8KPj4+Pgo+Pj4gc2V0dXBfbWNmZ19tYXAoKSBjYWxscyBhcmUgZG9uZSBpbiBvcmRl ciBvZiByb290IGJ1cyBkaXNjb3Zlcnkgd2hpY2gKPj4+IGhhcHBlbnMgKmFmdGVyKiB0aGUgcHJl dmlvdXMgcm9vdCBidXMgaGFzIGJlZW4gZW51bWVyYXRlZC4gU28gdGhlIG9yZGVyCj4+PiBpczog Y2FsbCBzZXR1cF9tY2ZnX21hcCgpIGZvciByb290IGJ1cyAwLCBmaW5kIHRoYXQKPj4+IHBjaV9t bWNmZ19sYXRlX2luaXQoKSBoYXMgZmluaXNoZWQgTUNGRyBhcmVhIHJlZ2lzdHJhdGlvbiwgcGVy Zm9ybSBQQ0kKPj4+IGVudW1lcmF0aW9uIG9mIGJ1cyAwLCBjYWxsIHhlbl9hZGRfZGV2aWNlKCkg Zm9yIGV2ZXJ5IGRldmljZSB0aGVyZSwgY2FsbAo+Pj4gc2V0dXBfbWNmZ19tYXAoKSBmb3Igcm9v dCBidXMgWCwgZXRjLgo+PiBBaCwgeWVzLiBNdWx0aXBsZSBidXNzZXMuCj4+Cj4+IElmIHRoYXQn cyB0aGUgY2FzZSB0aGVuIHdoeSBkb24ndCB3ZSBuZWVkIHRvIGNhbGwgeGVuX21jZmdfbGF0ZSgp IGZvcgo+PiB0aGUgZmlyc3QgZGV2aWNlIG9uIGVhY2ggYnVzPwo+Pgo+IElkZWFsbHksIHllcyAt IHdlJ2QgbGlrZSB0byBjYWxsIGl0IGZvciBldmVyeSBidXMgZGlzY292ZXJlZC4gQnV0IGJvb3QK PiB0aW1lIGJ1c2VzIGFyZSBhbHJlYWR5IGluIE1DRkcgKG90aGVyd2lzZSBzeXN0ZW0gYm9vdCBt aWdodCBub3Qgc2ltcGx5Cj4gd29yayBhcyBKYW4gcG9pbnRlZCBvdXQpIHNvIGl0J3Mgbm90IHN0 cmljdGx5IHJlcXVpcmVkLiBUaGUgb25seSBjYXNlIGlzCj4gYSBwb3RlbnRpYWwgUENJIGJ1cyBo b3QtcGx1ZyBidXQgSSdtIG5vdCBzdXJlIGl0IGFjdHVhbGx5IHdvcmtzIGluCj4gcHJhY3RpY2Ug YW5kIHdlIGNlcnRhaW5seSBkaWRuJ3Qgc3VwcG9ydCBpdCBiZWZvcmUuIEl0IG1pZ2h0IGJlIHNv bHZlZAo+IHRoZW9yZXRpY2FsbHkgYnkgc3Vic2NyaWJpbmcgdG8gYWNwaV9idXNfdHlwZSB0aGF0 IGlzIGF2YWlsYWJsZSBhZnRlcgo+IGFjcGlfaW5pdCgpLgoKT0suIFRoZW4gKkkgdGhpbmsqIHdl IGNhbiBkcm9wIGxhdGVfaW5pdGNhbGwoKSBidXQgSSB3b3VsZCByZWFsbHkgbGlrZQp0byBoZWFy IHdoZW4gb3RoZXJzIHRoaW5rLgoKLWJvcmlzCgoKCgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwpYZW4tZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBs aXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczovL2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4v bGlzdGluZm8veGVuLWRldmVs