Re: DAX can not work on virtual nvdimm device

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On 08/30/2016 03:30 AM, Ross Zwisler wrote:


Can you please verify that you are using "usable" memory for your memmap?  All
the details are here:

https://nvdimm.wiki.kernel.org/how_to_choose_the_correct_memmap_kernel_parameter_for_pmem_on_your_system

Sure.

This is the BIOS E820 info in the guest:

e820: BIOS-provided physical RAM map:
BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
BIOS-e820: [mem 0x0000000000100000-0x00000000bffdefff] usable
BIOS-e820: [mem 0x00000000bffdf000-0x00000000bfffffff] reserved
BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
BIOS-e820: [mem 0x0000000100000000-0x000000083fffffff] usable
NX (Execute Disable) protection: active
e820: user-defined physical RAM map:
user: [mem 0x0000000000000000-0x000000000009fbff] usable
user: [mem 0x000000000009fc00-0x000000000009ffff] reserved
user: [mem 0x00000000000f0000-0x00000000000fffff] reserved
user: [mem 0x0000000000100000-0x00000000bffdefff] usable
user: [mem 0x00000000bffdf000-0x00000000bfffffff] reserved
user: [mem 0x00000000feffc000-0x00000000feffffff] reserved
user: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
user: [mem 0x0000000100000000-0x000000027fffffff] usable
user: [mem 0x0000000280000000-0x00000003ffffffff] persistent (type 12)
user: [mem 0x0000000400000000-0x000000083fffffff] usable

So that the memory we used to emulate PMEM split the 'usable' region.


My guess is that Boaz was correct, and that your memmap is off using addresses
that don't actually map to memory.

I do not think so. :(

I did mmap-write and mmap-read test, the data written by mmap-write can be
correctly read out, so that the backend memory is really existing.

Thanks!
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