Re: [PATCH 2/3] KVM: Guest page hinting functionality

[Rik van Riel <riel@xxxxxxxxxx>]

On Wed, 2017-08-02 at 08:19 -0400, Pankaj Gupta wrote:
> > 
> > +        write_seqlock(&guest_page_lock);
> > +        while (idx < MAX_FGPT_ENTRIES) {
> > +                unsigned long pfn = free_page_obj[idx].pfn;
> > +                unsigned long pfn_end = free_page_obj[idx].pfn +
> > +                                        free_page_obj[idx].pages -
> > 1;
> > +                bool prev_free = false;
> > +
> > +                while (pfn <= pfn_end) {
> > +                        struct page *p = pfn_to_page(pfn);
> 
>  just one thing here, if we want/planning to use pmem as RAM this
> might not work, because pfn will not 
>  have corresponding 'struct page'?

pmem is never really used as RAM; allocating
and freeing space in pmem is done by a filesystem,
not by the memory management subsystem.

-- 
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