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

[Yi Zhang <yi.z.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

On 2018-10-19 at 12:33:48 -0400, Barret Rhoden wrote:
> On 2018-09-21 at 21:29 David Hildenbrand <david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> > On 21/09/2018 20:17, Dan Williams wrote:
> > > On Fri, Sep 21, 2018 at 7:24 AM David Hildenbrand <david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 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()?
Yes, we are going to remove the PageReserved flag for nvdimm pages.
Added Alex, attached the patch-set.
> 
> Thanks,
> 
> Barret
> 
> 
>