[libvirt] QEMU -M nvdimm=on and hotplug

[Stefan Hajnoczi]

On Wed, Sep 13, 2017 at 05:28:56PM +0200, Michal Privoznik wrote:
> On 09/13/2017 03:54 PM, Stefan Hajnoczi wrote:
> > 2. Only allow NVDIMM hotplug if the domain was started with -M
> >    nvdimm=on.
> > 
> > I think QEMU will not add -M nvdimm=on to the "pc" machine type by
> > default since it adds the NVDIMM DSM hardware interface that increases
> > the security attack surface.
> 
> So this is the downside. Well, I think all that we are left with is
> option 2 then. Or, we can expose nvdimm=on the domain XML (and enable it
> by default for any domain that already has a nvdimm device configured).

There probably needs to be an explicit nvdimm=on XML element so that
domains can be created without NVDIMMs at boot but the ability to
hotplug NVDIMMs later.

Stefan