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

From: Boaz Harrosh
Date: Sun Feb 22 2015 - 12:15:37 EST

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)


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