Re: [Qemu-devel] [PATCH v2 0/7] Qemu virtio pmem device

[Wei Yang]

On Tue, Jul 02, 2019 at 10:31:01PM -0400, Pankaj Gupta wrote:
>
>
>> 
>> Ok, if it works, we could list those regions? and change pmem0 mode to dax
>> mode, right?
>
>You mean fs dax?
>I don't think currently we support this because raw image wont have any 
>metadata. 
>Will have to think if this is at all possible or how we can achieve such 
>behavior.
>

Ok, I got it.

>Also, there is requirement to support host backing file on real NVDIMM and
>virtio. Once we have have first version of virtio pmem series merged upstream
>we will continue to work on advance features depending upon feasibility.
>

One curiosity, what difference make NVDIMM backend doesn't work now?

The /dev/dax0.0 is a char file. The nvdimm device use mmap to map HVA to HPA.
It looks a normal file to me. Would appreciated it if you would share some
light on it.

>Thanks,
>Pankaj 
>
>

-- 
Wei Yang
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