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=-7.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,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 9BB49C433E0 for ; Mon, 18 Jan 2021 10:18:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5689C2253A for ; Mon, 18 Jan 2021 10:18:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389778AbhARKPK (ORCPT ); Mon, 18 Jan 2021 05:15:10 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:43838 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389339AbhARJwK (ORCPT ); Mon, 18 Jan 2021 04:52:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610963442; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=r6zQEH2ZgVft/o+0qtfsDU1QY8mzvxQi41Uv+5hZEWU=; b=Ot9+rl+XUWus/3iOMAzxxdeBr+XrZz2M6JjzaliG/PZmHHLJS7mW7G7a9lLsqVDuIjkdGV OUqXzXYkWC7KU79G8uRHyS+kIpt6n+flaTgUAafABzEQ+nckNdQ/66SKHdni/d9ej//EMF Ots3ewtz0V3oBA7jg/gef32Ps1WzbC4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-359-VFNe5a4uOOW0EqXpWP48zw-1; Mon, 18 Jan 2021 04:50:39 -0500 X-MC-Unique: VFNe5a4uOOW0EqXpWP48zw-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 45C17107ACE4; Mon, 18 Jan 2021 09:50:36 +0000 (UTC) Received: from [10.36.112.158] (ovpn-112-158.ams2.redhat.com [10.36.112.158]) by smtp.corp.redhat.com (Postfix) with ESMTP id ABDAB5B699; Mon, 18 Jan 2021 09:50:27 +0000 (UTC) Subject: Re: [PATCH v2 0/2] Make it possible to reserve memory on 64bit platform To: "zhaowei1102@thundersoft.com" , Dan Williams Cc: Andrew Morton , Andy Shevchenko , Kees Cook , Thomas Gleixner , kerneldev , Arvind Sankar , Joe Perches , gpiccoli , aquini , gustavoars , ojeda , Linux Kernel Mailing List , guohanjun , mchehab+huawei References: <1610793673-64008-1-git-send-email-zhaowei1102@thundersoft.com> <202101181151049299923@thundersoft.com> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <15269a61-3b16-4c07-2486-6940c559261e@redhat.com> Date: Mon, 18 Jan 2021 10:50:26 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <202101181151049299923@thundersoft.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18.01.21 04:51, zhaowei1102@thundersoft.com wrote: > On Sat, Jan 16, 2021 at 2:43 AM Wesley Zhao > wrote: > >> > >> I was trying to reserve some memory to save logs incase that > Android panic or hang and then > >> I can read the logs from QNX side from the memory reserved before > on the Qualcomm 8155 hypervisor platform, > >> and I find the "reserve=" parameter only support 32bit,so I made > some change and send these patches. > >  > >See Documentation/admin-guide/kernel-parameters.txt > >  > >        memmap=nn[KMG]$ss[KMG] > >                        [KNL,ACPI] Mark specific memory as reserved. > >                        Region of memory to be reserved is from ss > to ss+nn. > >                        Example: Exclude memory from > 0x18690000-0x1869ffff > >                                 memmap=64K$0x18690000 > >                                 or > >                                 memmap=0x10000$0x18690000 > >                        Some bootloaders may need an escape character > >before '$', > >                        like Grub2, otherwise '$' and the following > number > >                        will be eaten. > Sorry，what is your point： >  static int __init reserve_setup(char *str) >  static struct resource reserve[MAXRESERVE]; >  for (;;) { >  unsigned int io_start, io_num;*  // these code is not compatible > with 64bit，i start from here* > Dan's point is that you should look into using "memmap=" instead of "reserve=". -- Thanks, David / dhildenb