Re: [Xen-devel] [RFC Design Doc] Add vNVDIMM support for Xen

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Zhang, Haozhong
> Sent: Tuesday, February 02, 2016 3:39 PM
> 
> > btw, how is persistency guaranteed in KVM/QEMU, cross guest
> > power off/on? I guess since Qemu process is killed the allocated pmem
> > will be freed so you may switch to file-backed method to keep
> > persistency (however copy would take time for large pmem trunk). Or
> > will you find some way to keep pmem managed separated from qemu
> > qemu life-cycle (then pmem is not efficiently reused)?
> >
> 
> It all depends on guests themselves. clwb/clflushopt/pcommit
> instructions are exposed to guest that are used by guests to make
> writes to pmem persistent.
> 

I meant from guest p.o.v, a range of pmem should be persistent
cross VM power on/off, i.e. the content needs to be maintained
somewhere so guest can get it at next power on...

Thanks
Kevin

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