Re: [Xen-devel] [RFC XEN PATCH v4 00/41] Add vNVDIMM support to HVM domains

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.02.18 at 11:29, <roger.pau@xxxxxxxxxx> wrote:
> On Tue, Feb 13, 2018 at 03:06:24AM -0700, Jan Beulich wrote:
>> >>> On 12.02.18 at 11:05, <roger.pau@xxxxxxxxxx> wrote:
>> > If you map the NVDIMM as MMIO to Dom0 you don't need the M2P entries
>> > IIRC, and if it's mapped using 1GB pages it shouldn't use that much
>> > memory for the page tables (ie: you could just use normal RAM for the
>> > page tables that map the NVDIMM IMO). Of course that only applies to
>> > PVH/HVM.
>> 
>> But in order to use (part of) it in a RAM-like manner we need struct
>> page_info for it.
> 
> I guess the main use of this would be to grant NVDIMM pages? And
> without a page_info that's not possible.

Why grant? Simply giving such a page as RAM to a guest would
already be a problem without struct page_info (as then we can't
track the page owner, nor can we refcount the page).

Jan


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