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

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Message-ID: <DM2PR21MB00898300C1E6F6761AC2ECD1CB150@DM2PR21MB0089.namprd21.prod.outlook.com>
Date:   Thu, 18 Aug 2016 18:05:01 +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

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.

-----Original Message-----
From: Dan Williams [mailto:dan.j.williams@...el.com] 
Sent: Thursday, August 18, 2016 2:03 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 10:50 AM, Matthew Wilcox <mawilcox@...rosoft.com> wrote:
> This is the memmap= kernel command line option.

The Hyper-V ACPI tables are growing NFIT support, or I believe that work is already underway.  I'd rather not touch the Linux PCI core to cover for the fact that Hyper-V disables one of the kernel's debug command line options when there's a platform standard way to communicate these resources.