On Sat, Oct 10, 2015 at 8:52 PM, Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> wrote: [..] > ====== Test ====== > In host > 1) create memory backed file, e.g # dd if=zero of=/tmp/nvdimm bs=1G count=10 > 2) append "-object memory-backend-file,share,id=mem1, > mem-path=/tmp/nvdimm -device nvdimm,memdev=mem1,reserve-label-data, > id=nv1" in QEMU command line > > In guest, download the latest upsteam kernel (4.2 merge window) and enable > ACPI_NFIT, LIBNVDIMM and BLK_DEV_PMEM. > 1) insmod drivers/nvdimm/libnvdimm.ko > 2) insmod drivers/acpi/nfit.ko > 3) insmod drivers/nvdimm/nd_btt.ko > 4) insmod drivers/nvdimm/nd_pmem.ko > You can see the whole nvdimm device used as a single namespace and /dev/pmem0 > appears. You can do whatever on /dev/pmem0 including DAX access. > > Currently Linux NVDIMM driver does not support namespace operation on this > kind of PMEM, apply below changes to support dynamical namespace: > > @@ -798,7 +823,8 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc *a > continue; > } > > - if (nfit_mem->bdw && nfit_mem->memdev_pmem) > + //if (nfit_mem->bdw && nfit_mem->memdev_pmem) > + if (nfit_mem->memdev_pmem) > flags |= NDD_ALIASING; This is just for testing purposes, right? I expect guests can sub-divide persistent memory capacity by partitioning the resulting block device(s). -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
