linux-kernel - Re: [tip:x86/pmem] x86/mm: Add support for the non-standard protected e820 type

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Date:	Thu, 2 Apr 2015 12:51:05 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	axboe@...com, Boaz Harrosh <boaz@...xistor.com>,
	Dan Williams <dan.j.williams@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jens Axboe <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>, keith.busch@...el.com,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/pmem] x86/mm: Add support for the non-standard protected
 e820 type

On Thu, Apr 2, 2015 at 12:13 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Andy Lutomirski <luto@...capital.net> wrote:
>
>> On Thu, Apr 2, 2015 at 5:31 AM, tip-bot for Christoph Hellwig
>> <tipbot@...or.com> wrote:
>> > Commit-ID:  ec776ef6bbe1734c29cd6bd05219cd93b2731bd4
>> > Gitweb:     http://git.kernel.org/tip/ec776ef6bbe1734c29cd6bd05219cd93b2731bd4
>> > Author:     Christoph Hellwig <hch@....de>
>> > AuthorDate: Wed, 1 Apr 2015 09:12:18 +0200
>> > Committer:  Ingo Molnar <mingo@...nel.org>
>> > CommitDate: Wed, 1 Apr 2015 17:02:43 +0200
>> >
>> > x86/mm: Add support for the non-standard protected e820 type
>> >
>> > Various recent BIOSes support NVDIMMs or ADR using a
>> > non-standard e820 memory type, and Intel supplied reference
>> > Linux code using this type to various vendors.
>> >
>> > Wire this e820 table type up to export platform devices for the
>> > pmem driver so that we can use it in Linux.
>>
>> This scares me a bit.  Do we know that the upcoming ACPI 6.0
>> enumeration mechanism *won't* use e820 type 12? [...]
>
> So I know nothing about it, but I'd be surprised if e820 was touched
> at all, as e820 isn't really well suited to enumerate more complex
> resources, and it appears pmem wants to grow into complex directions?

I hope so, but I have no idea what the ACPI committee's schemes are.

We could require pmem.enable_legacy_e820=Y to load the driver for now
if we're concerned about it.

--Andy

>
> Thanks,
>
>         Ingo



-- 
Andy Lutomirski
AMA Capital Management, LLC
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