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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 A0B04ECE588 for ; Wed, 16 Oct 2019 08:40:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6CB8C21835 for ; Wed, 16 Oct 2019 08:40:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391703AbfJPIks (ORCPT ); Wed, 16 Oct 2019 04:40:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43212 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389094AbfJPIkr (ORCPT ); Wed, 16 Oct 2019 04:40:47 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 473FB18CB8E5; Wed, 16 Oct 2019 08:40:47 +0000 (UTC) Received: from localhost.localdomain (ovpn-12-16.pek2.redhat.com [10.72.12.16]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 378E260A97; Wed, 16 Oct 2019 08:40:32 +0000 (UTC) Subject: Re: [PATCH 3/3 v3] x86/kdump: clean up all the code related to the backup region To: "Eric W. Biederman" Cc: Dave Young , linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, bhe@redhat.com, jgross@suse.com, dhowells@redhat.com, Thomas.Lendacky@amd.com, vgoyal@redhat.com, kexec@lists.infradead.org References: <20191012022140.19003-1-lijiang@redhat.com> <20191012022140.19003-4-lijiang@redhat.com> <87d0f22oi5.fsf@x220.int.ebiederm.org> <20191012121625.GA11587@dhcp-128-65.nay.redhat.com> <87zhi51ers.fsf@x220.int.ebiederm.org> <72edff0b-9778-2e83-224b-7fe70dfb8d73@redhat.com> <8736fu1d8k.fsf@x220.int.ebiederm.org> From: lijiang Message-ID: Date: Wed, 16 Oct 2019 16:40:29 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <8736fu1d8k.fsf@x220.int.ebiederm.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.63]); Wed, 16 Oct 2019 08:40:47 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 在 2019年10月15日 19:04, Eric W. Biederman 写道: > lijiang writes: > >> 在 2019年10月13日 11:54, Eric W. Biederman 写道: >>> Dave Young writes: >>> >>>> Hi Eric, >>>> >>>> On 10/12/19 at 06:26am, Eric W. Biederman wrote: >>>>> Lianbo Jiang writes: >>>>> >>>>>> When the crashkernel kernel command line option is specified, the >>>>>> low 1MiB memory will always be reserved, which makes that the memory >>>>>> allocated later won't fall into the low 1MiB area, thereby, it's not >>>>>> necessary to create a backup region and also no need to copy the first >>>>>> 640k content to a backup region. >>>>>> >>>>>> Currently, the code related to the backup region can be safely removed, >>>>>> so lets clean up. >>>>>> >>>>>> Signed-off-by: Lianbo Jiang >>>>>> --- >>>>> >>>>>> diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c >>>>>> index eb651fbde92a..cc5774fc84c0 100644 >>>>>> --- a/arch/x86/kernel/crash.c >>>>>> +++ b/arch/x86/kernel/crash.c >>>>>> @@ -173,8 +173,6 @@ void native_machine_crash_shutdown(struct pt_regs *regs) >>>>>> >>>>>> #ifdef CONFIG_KEXEC_FILE >>>>>> >>>>>> -static unsigned long crash_zero_bytes; >>>>>> - >>>>>> static int get_nr_ram_ranges_callback(struct resource *res, void *arg) >>>>>> { >>>>>> unsigned int *nr_ranges = arg; >>>>>> @@ -234,9 +232,15 @@ static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg) >>>>>> { >>>>>> struct crash_mem *cmem = arg; >>>>>> >>>>>> - cmem->ranges[cmem->nr_ranges].start = res->start; >>>>>> - cmem->ranges[cmem->nr_ranges].end = res->end; >>>>>> - cmem->nr_ranges++; >>>>>> + if (res->start >= SZ_1M) { >>>>>> + cmem->ranges[cmem->nr_ranges].start = res->start; >>>>>> + cmem->ranges[cmem->nr_ranges].end = res->end; >>>>>> + cmem->nr_ranges++; >>>>>> + } else if (res->end > SZ_1M) { >>>>>> + cmem->ranges[cmem->nr_ranges].start = SZ_1M; >>>>>> + cmem->ranges[cmem->nr_ranges].end = res->end; >>>>>> + cmem->nr_ranges++; >>>>>> + } >>>>> >>>>> What is going on with this chunk? I can guess but this needs a clear >>>>> comment. >>>> >>>> Indeed it needs some code comment, this is based on some offline >>>> discussion. cat /proc/vmcore will give a warning because ioremap is >>>> mapping the system ram. >>>> >>>> We pass the first 1M to kdump kernel in e820 as system ram so that 2nd >>>> kernel can use the low 1M memory because for example the trampoline >>>> code. >>>> >>>>> >>>>>> >>>>>> return 0; >>>>>> } >>>>> >>>>>> @@ -356,9 +337,12 @@ int crash_setup_memmap_entries(struct kimage *image, struct boot_params *params) >>>>>> memset(&cmd, 0, sizeof(struct crash_memmap_data)); >>>>>> cmd.params = params; >>>>>> >>>>>> - /* Add first 640K segment */ >>>>>> - ei.addr = image->arch.backup_src_start; >>>>>> - ei.size = image->arch.backup_src_sz; >>>>>> + /* >>>>>> + * Add the low memory range[0x1000, SZ_1M], skip >>>>>> + * the first zero page. >>>>>> + */ >>>>>> + ei.addr = PAGE_SIZE; >>>>>> + ei.size = SZ_1M - PAGE_SIZE; >>>>>> ei.type = E820_TYPE_RAM; >>>>>> add_e820_entry(params, &ei); >>>>> >>>>> Likewise here. Why do we need a special case? >>>>> Why the magic with PAGE_SIZE? >>>> >>>> Good catch, the zero page part is useless, I think no other special >>>> reason, just assumed zero page is not usable, but it should be ok to >>>> remove the special handling, just pass 0 - 1M is good enough. >>> >>> But if we have stopped special casing the low 1M. Why do we need a >>> special case here at all? >>> >> Here, need to pass the low memory range to kdump kernel, which will guarantee >> the availability of low memory in kdump kernel, otherwise, kdump kernel won't >> use the low memory region. >> >>> If you need the special case it is almost certainly wrong to say you >>> have ram above 640KiB and below 1MiB. That is the legacy ROM and video >>> MMIO area. >>> >>> There is a reason the original code said 640KiB. >>> >> Do you mean that the 640k region is good enough here instead of 1MiB? > > Reading through the code of crash_setup_memap_entries I see that what > the code is doing now. The code is repeating the e820 memory map with > the memory areas that were not reserved for the crash kernel removed. > > In which case what the code needs to be doing something like: > > cmd.type = E820_TYPE_RAM; > flags = IORESOURCE_MEM; > walk_iomem_res_desc(IORES_DESC_RESERVED, flags, 0, 1024*1024, &cmd, > memmap_entry_callback); > > Depending on which bugs exist it might make sense to limit this to > the low 640KiB. But finding something the kernel already recognizes > as RAM should prevent most of those problems already. Barring bugs > I admit it doesn't make sense to repeat the work that someone else > has already done. > > This bit: > /* Add e820 reserved ranges */ > cmd.type = E820_TYPE_RESERVED; > flags = IORESOURCE_MEM; > walk_iomem_res_desc(IORES_DESC_RESERVED, flags, 0, -1, &cmd, > memmap_entry_callback); > > Should probably start at 1MiB instead of 0. Just so we don't report the > memory below 1MiB as unconditionally reserved. I don't properly > understand the IORES_DESC_RESERVED flag, and how that differs from > flags. So please test my suggestions to verify the code works as > expected. > Thanks for your comment, Eric. I will make a test based on your suggestions. But i need an SME machine, maybe i will reply later. Thanks. Lianbo > Eric >