linux-kernel - RE: [RFC 3/3] x86, mirror: x86 enabling - find mirrored memory ranges and tell memblock

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Date:	Mon, 18 May 2015 17:36:07 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Xiexiuqi <xiexiuqi@...wei.com>, Linux MM <linux-mm@...ck.org>
Subject: RE: [RFC 3/3] x86, mirror: x86 enabling - find mirrored memory
 ranges and tell memblock

On 2015/2/4 6:40, Tony Luck wrote:
>> Can't post this part yet because it uses things in an upcoming[*] ACPI, UEFI, or some
>> other four-letter-ending-in-I standard.  So just imagine a call someplace early
>> in startup that reads information about mirrored address ranges and does:
>> 

> Does the upcoming[*] ACPI will add a new flag in SRAT tables? just like memory hotplug.
>
> #define ACPI_SRAT_MEM_HOT_PLUGGABLE (1<<1)	/* 01: Memory region is hot pluggable */
> +#define ACPI_SRAT_MEM_MIRROR	    (1<<3)	/* 03: Memory region is mirrored */

The choice for this was UEFI - new attribute bit in the GetMemoryMap() return value.

UEFI 2.5 has been published with this change and I posted a newer patch 10 days ago:

  https://lkml.org/lkml/2015/5/8/521

-Tony
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