>>> Andrew Cooper <andrew.coop...@citrix.com> 10/10/16 6:44 PM >>> >On 10/10/16 01:35, Haozhong Zhang wrote: >> Xen hypervisor needs assistance from Dom0 Linux kernel for following tasks: >> 1) Reserve an area on NVDIMM devices for Xen hypervisor to place >> memory management data structures, i.e. frame table and M2P table. >> 2) Report SPA ranges of NVDIMM devices and the reserved area to Xen >> hypervisor. > >However, I can't see any justification for 1). Dom0 should not be >involved in Xen's management of its own frame table and m2p. The mfns >making up the pmem/pblk regions should be treated just like any other >MMIO regions, and be handed wholesale to dom0 by default.
That precludes the use as RAM extension, and I thought earlier rounds of discussion had got everyone in agreement that at least for the pmem case we will need some control data in Xen. Jan
