On Tue, Aug 30, 2022 at 05:43:43PM +0200, David Hildenbrand wrote: > I think one approach is mmap'ing a devdax device. To test without actual > NVDIMM hardware, there are ways to simulate it even on bare metal using > the "memmap=" kernel parameter. > > https://nvdimm.wiki.kernel.org/ > > Alternatively, you can use an emulated nvdimm device under QEMU -- but > then you'd have to run VFIO inside the VM. I know (that you know) that > there are ways to get that working, but it certainly requires more effort :) > > ... let me know if you need any tips&tricks. currently pin_user_pages will not return ZONE_DEVICE pages anyhow, so it is not relevant to this snippet You might seem them on that follow_pfn flow though :\ Jason
