Re: [Xen-devel] [RFC XEN PATCH 03/16] xen/x86: add a hypercall XENPF_pmem_add to report host pmem regions

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.12.16 at 05:16, <haozhong.zhang@xxxxxxxxx> wrote:
> On 12/09/16 17:02 -0500, Konrad Rzeszutek Wilk wrote:
>>On Mon, Oct 10, 2016 at 08:32:22AM +0800, Haozhong Zhang wrote:
>>> +static int pmem_add_check(unsigned long spfn, unsigned long epfn,
>>> +                          unsigned long rsv_spfn, unsigned long rsv_epfn,
>>> +                          unsigned long data_spfn, unsigned long data_epfn)
>>> +{
>>> +    if ( spfn >= epfn || rsv_spfn >= rsv_epfn || data_spfn >= data_epfn )
>>> +        return 0;
>>
>>Hm, I think it ought to be possible to have no rsv area..?
> 
> A reserved area must be provided to storing frametable and M2P table of 
> NVDIMM.

Is this really "must" rather than just "should", i.e. can't you do
without even if you prefer to have it?

Jan


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