Re: [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem.

[Barret Rhoden]

On 2018-09-21 at 21:29 David Hildenbrand <david@xxxxxxxxxx> wrote:
> On 21/09/2018 20:17, Dan Williams wrote:
> > On Fri, Sep 21, 2018 at 7:24 AM David Hildenbrand <david@xxxxxxxxxx> wrote:
> > [..]  
> >>> Remove the PageReserved flag sounds more reasonable.
> >>> And Could we still have a flag to identify it is a device private memory, or
> >>> where these pages coming from?  
> >>
> >> We could use a page type for that or what you proposed. (as I said, we
> >> might have to change hibernation code to skip the pages once we drop the
> >> reserved flag).  
> > 
> > I think it would be reasonable to reject all ZONE_DEVICE pages in
> > saveable_page().
> >   
> 
> Indeed, that sounds like the easiest solution - guess that answer was
> too easy for me to figure out :) .
> 

Just to follow-up, is the plan to clear PageReserved for nvdimm pages
instead of the approach taken in this patch set?  Or should we special
case nvdimm/dax pages in kvm_is_reserved_pfn()?

Thanks,

Barret