linux-kernel - Re: [RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20181227034141.GD20878@bombadil.infradead.org>
Date:   Wed, 26 Dec 2018 19:41:41 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Fan Du <fan.du@...el.com>, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Yao Yuan <yuan.yao@...el.com>,
        Peng Dong <dongx.peng@...el.com>,
        Huang Ying <ying.huang@...el.com>,
        Liu Jingqi <jingqi.liu@...el.com>,
        Dong Eddie <eddie.dong@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Zhang Yi <yi.z.zhang@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [RFC][PATCH v2 01/21] e820: cheat PMEM as DRAM

On Wed, Dec 26, 2018 at 09:14:47PM +0800, Fengguang Wu wrote:
> From: Fan Du <fan.du@...el.com>
> 
> This is a hack to enumerate PMEM as NUMA nodes.
> It's necessary for current BIOS that don't yet fill ACPI HMAT table.
> 
> WARNING: take care to backup. It is mutual exclusive with libnvdimm
> subsystem and can destroy ndctl managed namespaces.

Why depend on firmware to present this "correctly"?  It seems to me like
less effort all around to have ndctl label some namespaces as being for
this kind of use.