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Re: [Xen-devel] One question about the hypercall to translate gfn to mfn.

On Mon, 15 Dec 2014, Jan Beulich wrote:
> >>> On 15.12.14 at 10:05, <kevin.tian@xxxxxxxxx> wrote:
> > yes, definitely host RAM is the upper limit, and what I'm concerning here
> > is how to reserve (at boot time) or allocate (on-demand) such large PFN
> > resource, w/o collision with other PFN reservation usage (ballooning
> > should be fine since it's operating existing RAM ranges in dom0 e820
> > table).
> I don't think ballooning is restricted to the regions named RAM in
> Dom0's E820 table (at least it shouldn't be, and wasn't in the
> classic Xen kernels).

Could you please elaborate more on this? It seems counter-intuitive at best.

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