linux-kernel - RE: [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation 2

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Message-ID: <DM2PR21MB00890E4AE41C24D9ACCEF56ACB150@DM2PR21MB0089.namprd21.prod.outlook.com>
Date:   Thu, 18 Aug 2016 18:26:17 +0000
From:   Matthew Wilcox <mawilcox@...rosoft.com>
To:     Dan Williams <dan.j.williams@...el.com>
CC:     Matthew Wilcox <mawilcox@...uxonhyperv.com>,
        X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: RE: [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation
 2

*Until* such a mechanism is in, I see no reason to not keep feature parity for all platforms.  This is the exact "You should boil the ocean" response that Arjan famously complained about at Kernel Summit a few years ago.

-----Original Message-----
From: Dan Williams [mailto:dan.j.williams@...el.com] 
Sent: Thursday, August 18, 2016 2:15 PM
To: Matthew Wilcox <mawilcox@...rosoft.com>
Cc: Matthew Wilcox <mawilcox@...uxonhyperv.com>; X86 ML <x86@...nel.org>; linux-kernel@...r.kernel.org; linux-nvdimm@...ts.01.org
Subject: Re: [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation 2

On Thu, Aug 18, 2016 at 11:05 AM, Matthew Wilcox <mawilcox@...rosoft.com> wrote:
> I'd rather the memmap= option works on all platforms.  Unless we're going to get rid of it entirely and exclusively use ACPI tables, I see no good reason to leave this landmine lying around for someone else to blow their own leg off.
>

memmap= is already a landmine: https://lkml.org/lkml/2016/6/28/819

Killing memmap= in favor of NFIT is a better way to go.  I chatted with Peter off list about this problem and he wondered about re-purposing using the mBFT mechanism to define memory ranges:

http://omniboot.org/txt/syslinux/memdisk.txt