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

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Message-ID: <DM2PR21MB0089B1DD11FCF8453E518678CB150@DM2PR21MB0089.namprd21.prod.outlook.com>
Date:   Thu, 18 Aug 2016 19:56:26 +0000
From:   Matthew Wilcox <mawilcox@...rosoft.com>
To:     Dan Williams <dan.j.williams@...el.com>
CC:     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

Compared to a patch which removes 5 lines of code, almost any additional work is ocean-boiling.

-----Original Message-----
From: Dan Williams [mailto:dan.j.williams@...el.com] 
Sent: Thursday, August 18, 2016 3:12 PM
To: Matthew Wilcox <mawilcox@...rosoft.com>
Cc: 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 11:26 AM, Matthew Wilcox <mawilcox@...rosoft.com> wrote:
> *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.

Feature parity for all platforms is the NFIT which Hyper-V is already implementing.

Setting that aside, if we want to fix memmap= for the general case, implementing a table like mBFT does not amount to ocean boiling in my opinion.