On Tue, Feb 13, 2018 at 04:05:45AM -0700, Jan Beulich wrote: > >>> On 13.02.18 at 11:29, <roger....@citrix.com> wrote: > > On Tue, Feb 13, 2018 at 03:06:24AM -0700, Jan Beulich wrote: > >> >>> On 12.02.18 at 11:05, <roger....@citrix.com> 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).
My point was to avoid doing that, and always assign the pages as MMIO, which IIRC doesn't require a struct page_info. Roger. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
