Re: [Qemu-devel] [PATCH v2 0/2] kvm "fake DAX" device

[Pankaj Gupta]

> >
> >  This patch series has implementation for "fake DAX".
> >  "fake DAX" is fake persistent memory(nvdimm) in guest
> >  which allows to bypass the guest page cache. This also
> >  implements a VIRTIO based asynchronous flush mechanism.
> 
> Can we stop calling this 'fake DAX', because it isn't 'DAX' and it's
> starting to confuse people. This enabling is effectively a
> host-page-cache-passthrough mechanism not DAX. Let's call the whole
> approach virtio-pmem, and leave DAX out of the name to hopefully
> prevent people from wondering why some DAX features are disabled with
> this driver. For example MAP_SYNC is not compatible with this
> approach.

Sure. I got your point. I will use "virtio-pmem" in future.  

> 
> Additional enabling is need to disable MAP_SYNC in the presence of a
> virtio-pmem device. See the rough proposal here:
> 
>     https://lkml.org/lkml/2018/4/25/756

Yes, I will handle disabling of MAP_SYNC for this use-case.


Thanks,
Pankaj