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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 BA2E5C433E0 for ; Sun, 17 Jan 2021 19:07:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F636224BD for ; Sun, 17 Jan 2021 19:07:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729981AbhAQTGs (ORCPT ); Sun, 17 Jan 2021 14:06:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729614AbhAQTDj (ORCPT ); Sun, 17 Jan 2021 14:03:39 -0500 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB86EC061575 for ; Sun, 17 Jan 2021 11:02:39 -0800 (PST) Received: by mail-ed1-x536.google.com with SMTP id c6so8057813ede.0 for ; Sun, 17 Jan 2021 11:02:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=A4xcfgcrrBIcBhORUZhduWLLV8ym+o2ltWoOSy1l0dM=; b=zW0/5bPbpe3kbL88yMdiAr6BVrkLHCzmrzz/SgdumM4LVqGUc9NGZ/i4nBtRhOxc5C cM6JmHAvBUzytMaWyZeeGBeJ4Ct2eFgXESIuFflFWVWdzl+obQKJOLQYuLQfY8i1YBdT 0puSD7aEFN4gzJNlAYTkDMOqeUxCw0Ngl2xA3UKCSwk5wr15NrqC0DFY4RT+XbTNhTp2 gHtDQWeWTBCxg9SywtcVTde/gd2El4JSPKj60SNJklQZy/UwtdlggH0CUhMh0oTwMrCT YUKt/c+uXUSJvfzapMxwUCoUnP9jpvKsJHTdDwrn4Qc/Z7an9ZeKrLWKlBsLg7d1jCdR DRBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=A4xcfgcrrBIcBhORUZhduWLLV8ym+o2ltWoOSy1l0dM=; b=pD+PWjsQ4z4fYc0YLEOjBI4O0YyEcm8VfZ3Ht66sztN2bUjnCaRSgUQIvJ0X6oR52C 2JYwxHidLNUlVwRtzGsOp3leHJJdXbi3HAbnvCJ51awhYVO1pTL7fLGkvS57am27uaFm BYHg2DFnKSHNbCy31nt5lGIFkLK8GahZPNtotLFpisP6F8NDlR2A8IxPKHTt4tAZvn9v fOYwIWpwdR58rxyj/ngYhkfhlPvva7wbPKcHNYdcq2PLSmXc6gLimHMSjBhx0zOdXrA7 Svq8SPGnBCQVQER/nTAJQB4y2hPFNEH7u1tdXl89e84RQTQd+qg3oOI1ArElOhT2NyYf B2rg== X-Gm-Message-State: AOAM531CeJnnwOV8xYPBYhdaxoRu7s+Gc6JxvJRt5YVS6pC+4zxaFj9V brYU5SqxmmMuiJ7/0sIy6pqwAUmaUR+aJjaVjKVpHw== X-Google-Smtp-Source: ABdhPJxTa9eC4SVYp5cPI1AafYblIVeFfmcM2kEMEeGV+24v4q+SQLojpBHxJ/Sxime8585xaXHpAYeuSO0HN/esCdg= X-Received: by 2002:a05:6402:1102:: with SMTP id u2mr17013263edv.18.1610910158542; Sun, 17 Jan 2021 11:02:38 -0800 (PST) MIME-Version: 1.0 References: <1610793673-64008-1-git-send-email-zhaowei1102@thundersoft.com> In-Reply-To: <1610793673-64008-1-git-send-email-zhaowei1102@thundersoft.com> From: Dan Williams Date: Sun, 17 Jan 2021 11:02:28 -0800 Message-ID: Subject: Re: [PATCH v2 0/2] Make it possible to reserve memory on 64bit platform To: Wesley Zhao Cc: Andrew Morton , Andy Shevchenko , Kees Cook , Thomas Gleixner , kerneldev@karsmulder.nl, Arvind Sankar , Joe Perches , gpiccoli@canonical.com, aquini@redhat.com, gustavoars@kernel.org, ojeda@kernel.org, ndesaulniers@gooogle.com, Linux Kernel Mailing List , David Hildenbrand , guohanjun@huawei.com, mchehab+huawei@kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.