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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 AD771C433F4 for ; Wed, 19 Sep 2018 12:53:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6CC552151B for ; Wed, 19 Sep 2018 12:53:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6CC552151B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731721AbeISSa6 (ORCPT ); Wed, 19 Sep 2018 14:30:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52951 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728192AbeISSa6 (ORCPT ); Wed, 19 Sep 2018 14:30:58 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DEBB3308ED65; Wed, 19 Sep 2018 12:53:08 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-12-52.pek2.redhat.com [10.72.12.52]) by smtp.corp.redhat.com (Postfix) with ESMTP id D4E4F18E28; Wed, 19 Sep 2018 12:52:56 +0000 (UTC) From: Lianbo Jiang To: linux-kernel@vger.kernel.org Cc: kexec@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, akpm@linux-foundation.org, dan.j.williams@intel.com, thomas.lendacky@amd.com, bhelgaas@google.com, baiyaowei@cmss.chinamobile.com, tiwai@suse.de, bp@suse.de, brijesh.singh@amd.com, dyoung@redhat.com Subject: [PATCH 0/3 v2] add reserved e820 ranges to the kdump kernel e820 table Date: Wed, 19 Sep 2018 20:52:48 +0800 Message-Id: <20180919125251.8181-1-lijiang@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Wed, 19 Sep 2018 12:53:09 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org E820 reserved ranges is useful in kdump kernel, we have added this in kexec-tools code. One reason is PCI mmconf (extended mode) requires reserved region otherwise it falls back to legacy mode. Furthermore, when AMD SME kdump support, it needs to map dmi table area as unencrypted. For normal boot these ranges sit in e820 reserved ranges thus the early ioremap code naturally map them as unencrypted. So if we have same e820 reserve setup in kdump kernel then it will just work like normal kernel. Kdump use walk_iomem_res_desc to iterate resources then add matched desc to e820 table for the kdump kernel. But IORES_DESC_NONE resource type includes several different e820 types, we need add exact e820 type to the kdump kernel e820 table thus need an extra checking in memmap_entry_callback() to match the e820 type and resource name. By the way, we also fix an error which walks through iomem resources, the values of the function parameter may be modified in the while loop of __walk_iomem_res_desc(), which will cause us to not get the desired result in some cases. Changes since v1: 1. We modified the value of flags to "0", when walking through the whole tree for e820 reserved ranges. Lianbo Jiang (3): resource: fix an error which walks through iomem resources x86/kexec_file: add e820 entry in case e820 type string matches to io resource name x86/kexec_file: add reserved e820 ranges to kdump kernel e820 table arch/x86/include/asm/e820/api.h | 2 ++ arch/x86/kernel/crash.c | 11 ++++++++++- arch/x86/kernel/e820.c | 2 +- kernel/resource.c | 3 +++ 4 files changed, 16 insertions(+), 2 deletions(-) -- 2.17.1