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=-2.4 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,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 1E4BBC433DF for ; Thu, 28 May 2020 22:23:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E17B8207BC for ; Thu, 28 May 2020 22:23:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="HZLKPY0R" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437096AbgE1WXf (ORCPT ); Thu, 28 May 2020 18:23:35 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:45162 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436992AbgE1WX3 (ORCPT ); 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Thu, 28 May 2020 22:22:47 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04SMDflD066940; Thu, 28 May 2020 22:20:46 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 31a9kt94ry-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 28 May 2020 22:20:46 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04SMKa36012836; Thu, 28 May 2020 22:20:36 GMT Received: from [192.168.1.106] (/47.220.71.223) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 28 May 2020 15:20:36 -0700 Subject: Re: [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump To: Baoquan He , Chen Zhou Cc: tglx@linutronix.de, mingo@redhat.com, catalin.marinas@arm.com, will@kernel.org, dyoung@redhat.com, robh+dt@kernel.org, arnd@arndb.de, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, horms@verge.net.au, guohanjun@huawei.com, pkushwaha@marvell.com, linux-arm-kernel@lists.infradead.org References: <20200521093805.64398-1-chenzhou10@huawei.com> <20200526014242.GF20045@MiWiFi-R3L-srv> From: John Donnelly Message-ID: <897ea1b9-a68c-8544-6532-a21be135ce01@oracle.com> Date: Thu, 28 May 2020 17:20:34 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200526014242.GF20045@MiWiFi-R3L-srv> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9635 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005280142 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9635 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxlogscore=999 adultscore=0 cotscore=-2147483648 mlxscore=0 bulkscore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1011 impostorscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005280143 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/25/20 8:42 PM, Baoquan He wrote: > On 05/21/20 at 05:38pm, Chen Zhou wrote: >> This patch series enable reserving crashkernel above 4G in arm64. >> >> There are following issues in arm64 kdump: >> 1. We use crashkernel=X to reserve crashkernel below 4G, which will fail >> when there is no enough low memory. >> 2. Currently, crashkernel=Y@X can be used to reserve crashkernel above 4G, >> in this case, if swiotlb or DMA buffers are required, crash dump kernel >> will boot failure because there is no low memory available for allocation. >> >> To solve these issues, introduce crashkernel=X,low to reserve specified >> size low memory. >> Crashkernel=X tries to reserve memory for the crash dump kernel under >> 4G. If crashkernel=Y,low is specified simultaneously, reserve spcified >> size low memory for crash kdump kernel devices firstly and then reserve >> memory above 4G. >> >> When crashkernel is reserved above 4G in memory, that is, crashkernel=X,low >> is specified simultaneously, kernel should reserve specified size low memory >> for crash dump kernel devices. So there may be two crash kernel regions, one >> is below 4G, the other is above 4G. >> In order to distinct from the high region and make no effect to the use of >> kexec-tools, rename the low region as "Crash kernel (low)", and add DT property >> "linux,low-memory-range" to crash dump kernel's dtb to pass the low region. >> >> Besides, we need to modify kexec-tools: >> arm64: kdump: add another DT property to crash dump kernel's dtb(see [1]) >> >> The previous changes and discussions can be retrieved from: >> >> Changes since [v7] >> - Move x86 CRASH_ALIGN to 2M >> Suggested by Dave and do some test, move x86 CRASH_ALIGN to 2M. > OK, moving x86 CRASH_ALIGN to 2M is suggested by Dave. Because > CONFIG_PHYSICAL_ALIGN can be selected from 2M to 16M. So 2M seems good. > But, anyway, we should tell the reason why it need be changed in commit > log. > > > arch/x86/Kconfig: > config PHYSICAL_ALIGN > hex "Alignment value to which kernel should be aligned" > default "0x200000" > range 0x2000 0x1000000 if X86_32 > range 0x200000 0x1000000 if X86_64 > >> - Update Documentation/devicetree/bindings/chosen.txt >> Add corresponding documentation to Documentation/devicetree/bindings/chosen.txt suggested by Arnd. >> - Add Tested-by from Jhon and pk >> >> Changes since [v6] >> - Fix build errors reported by kbuild test robot. >> >> Changes since [v5] >> - Move reserve_crashkernel_low() into kernel/crash_core.c. >> - Delete crashkernel=X,high. > And the crashkernel=X,high being deleted need be told too. Otherwise > people reading the commit have to check why themselves. I didn't follow > the old version, can't see why ,high can't be specified explicitly. > >> - Modify crashkernel=X,low. >> If crashkernel=X,low is specified simultaneously, reserve spcified size low >> memory for crash kdump kernel devices firstly and then reserve memory above 4G. >> In addition, rename crashk_low_res as "Crash kernel (low)" for arm64, and then >> pass to crash dump kernel by DT property "linux,low-memory-range". >> - Update Documentation/admin-guide/kdump/kdump.rst. >> >> Changes since [v4] >> - Reimplement memblock_cap_memory_ranges for multiple ranges by Mike. >> >> Changes since [v3] >> - Add memblock_cap_memory_ranges back for multiple ranges. >> - Fix some compiling warnings. >> >> Changes since [v2] >> - Split patch "arm64: kdump: support reserving crashkernel above 4G" as >> two. Put "move reserve_crashkernel_low() into kexec_core.c" in a separate >> patch. >> >> Changes since [v1]: >> - Move common reserve_crashkernel_low() code into kernel/kexec_core.c. >> - Remove memblock_cap_memory_ranges() i added in v1 and implement that >> in fdt_enforce_memory_region(). >> There are at most two crash kernel regions, for two crash kernel regions >> case, we cap the memory range [min(regs[*].start), max(regs[*].end)] >> and then remove the memory range in the middle. >> >> [1]: https://urldefense.com/v3/__http://lists.infradead.org/pipermail/kexec/2020-May/025128.html__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJwQs3C4x$ >> [v1]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/2/1174__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJ6e-mIEp$ >> [v2]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/9/86__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJyUVjUta$ >> [v3]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/9/306__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJ3CXBRdT$ >> [v4]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/4/15/273__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJ7SxW1Vj$ >> [v5]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/5/6/1360__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJ2wyJ9tj$ >> [v6]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/8/30/142__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJzvGhWBh$ >> [v7]: https://urldefense.com/v3/__https://lkml.org/lkml/2019/12/23/411__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJ6pAg6tX$ >> >> Chen Zhou (5): >> x86: kdump: move reserve_crashkernel_low() into crash_core.c >> arm64: kdump: reserve crashkenel above 4G for crash dump kernel >> arm64: kdump: add memory for devices by DT property, low-memory-range >> kdump: update Documentation about crashkernel on arm64 >> dt-bindings: chosen: Document linux,low-memory-range for arm64 kdump >> >> Documentation/admin-guide/kdump/kdump.rst | 13 ++- >> .../admin-guide/kernel-parameters.txt | 12 ++- >> Documentation/devicetree/bindings/chosen.txt | 25 ++++++ >> arch/arm64/kernel/setup.c | 8 +- >> arch/arm64/mm/init.c | 61 ++++++++++++- >> arch/x86/kernel/setup.c | 66 ++------------ >> include/linux/crash_core.h | 3 + >> include/linux/kexec.h | 2 - >> kernel/crash_core.c | 85 +++++++++++++++++++ >> kernel/kexec_core.c | 17 ---- >> 10 files changed, 208 insertions(+), 84 deletions(-) >> >> -- >> 2.20.1 >> >> >> _______________________________________________ >> kexec mailing list >> kexec@lists.infradead.org >> https://urldefense.com/v3/__http://lists.infradead.org/mailman/listinfo/kexec__;!!GqivPVa7Brio!NHQIQVbVz5bR1SSP7U7SwT3uHb6OnycPGa6nM0oLTaQdZT4pjRsjrMjn5GqOJwwX8HSl$ >> Hi, This proposal to improve vmcore creation on Arm  has been going on for almost a year now. Who is the  final maintainer that needs to approve and except these ? What are the lingering issues that are remaining so we get these accepted into a upstream commit ? Thank you. John. 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ESMTP id 31a9kt94ry-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 28 May 2020 22:20:46 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04SMKa36012836; Thu, 28 May 2020 22:20:36 GMT Received: from [192.168.1.106] (/47.220.71.223) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 28 May 2020 15:20:36 -0700 Subject: Re: [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump To: Baoquan He , Chen Zhou References: <20200521093805.64398-1-chenzhou10@huawei.com> <20200526014242.GF20045@MiWiFi-R3L-srv> From: John Donnelly Message-ID: <897ea1b9-a68c-8544-6532-a21be135ce01@oracle.com> Date: Thu, 28 May 2020 17:20:34 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200526014242.GF20045@MiWiFi-R3L-srv> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 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list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: horms@verge.net.au, devicetree@vger.kernel.org, arnd@arndb.de, will@kernel.org, linux-doc@vger.kernel.org, catalin.marinas@arm.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, mingo@redhat.com, guohanjun@huawei.com, tglx@linutronix.de, pkushwaha@marvell.com, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Ck9uIDUvMjUvMjAgODo0MiBQTSwgQmFvcXVhbiBIZSB3cm90ZToKPiBPbiAwNS8yMS8yMCBhdCAw NTozOHBtLCBDaGVuIFpob3Ugd3JvdGU6Cj4+IFRoaXMgcGF0Y2ggc2VyaWVzIGVuYWJsZSByZXNl cnZpbmcgY3Jhc2hrZXJuZWwgYWJvdmUgNEcgaW4gYXJtNjQuCj4+Cj4+IFRoZXJlIGFyZSBmb2xs b3dpbmcgaXNzdWVzIGluIGFybTY0IGtkdW1wOgo+PiAxLiBXZSB1c2UgY3Jhc2hrZXJuZWw9WCB0 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IHNvIHdlIGdldCB0aGVzZSAKYWNjZXB0ZWQgaW50byBhIHVwc3RyZWFtIGNvbW1pdCA/CgoKVGhh bmsgeW91LgoKSm9obi4KCgoKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxA bGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xp c3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Subject: Re: [PATCH v8 0/5] support reserving crashkernel above 4G on arm64 kdump References: <20200521093805.64398-1-chenzhou10@huawei.com> <20200526014242.GF20045@MiWiFi-R3L-srv> From: John Donnelly Message-ID: <897ea1b9-a68c-8544-6532-a21be135ce01@oracle.com> Date: Thu, 28 May 2020 17:20:34 -0500 MIME-Version: 1.0 In-Reply-To: <20200526014242.GF20045@MiWiFi-R3L-srv> Content-Language: en-US List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Baoquan He , Chen Zhou Cc: horms@verge.net.au, devicetree@vger.kernel.org, arnd@arndb.de, will@kernel.org, linux-doc@vger.kernel.org, catalin.marinas@arm.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, mingo@redhat.com, guohanjun@huawei.com, tglx@linutronix.de, pkushwaha@marvell.com, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org Ck9uIDUvMjUvMjAgODo0MiBQTSwgQmFvcXVhbiBIZSB3cm90ZToKPiBPbiAwNS8yMS8yMCBhdCAw NTozOHBtLCBDaGVuIFpob3Ugd3JvdGU6Cj4+IFRoaXMgcGF0Y2ggc2VyaWVzIGVuYWJsZSByZXNl cnZpbmcgY3Jhc2hrZXJuZWwgYWJvdmUgNEcgaW4gYXJtNjQuCj4+Cj4+IFRoZXJlIGFyZSBmb2xs b3dpbmcgaXNzdWVzIGluIGFybTY0IGtkdW1wOgo+PiAxLiBXZSB1c2UgY3Jhc2hrZXJuZWw9WCB0 byByZXNlcnZlIGNyYXNoa2VybmVsIGJlbG93IDRHLCB3aGljaCB3aWxsIGZhaWwKPj4gd2hlbiB0 aGVyZSBpcyBubyBlbm91Z2ggbG93IG1lbW9yeS4KPj4gMi4gQ3VycmVudGx5LCBjcmFzaGtlcm5l bD1ZQFggY2FuIGJlIHVzZWQgdG8gcmVzZXJ2ZSBjcmFzaGtlcm5lbCBhYm92ZSA0RywKPj4gaW4g 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