linux-kernel - Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

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Message-ID: <54EA0EAE.70708@plexistor.com>
Date:	Sun, 22 Feb 2015 19:15:26 +0200
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Dan Williams <dan.j.williams@...el.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>, x86@...nel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Roger C. Pao" <rcpao.enmotus@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

On 02/22/2015 07:05 PM, Boaz Harrosh wrote:
> On 02/22/2015 06:27 PM, Christoph Hellwig wrote:
<>
>> I won't be back to my nvdimm enabled hardware until after LSF/MM,
>> so any work from me in this area will have to wait a bit.
>>
<>

BTW: I have an out-of-tree patch that enables me to just emulate
an NvDIMM inside a VM, so I can develop at the comfort of my LP.

You can find it at my pmem tree.

All it does is adds a new type of memmap=.  So if you specify memmap=2G\&4G on
Kernel command-line the code will insert a type-12 memory to the list, instead of "reserved"
region when a "$" is parsed.

>From here on that region will look exactly like an DDR3-NvDIMM with
supporting BIOS to the system, safe the persistence of course.
(Actually there is a trick to force the KVM-Host to reserve that memory
 across VM boots, to emulate persistence)

Cheers
Boaz

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