On 10/11/2015 05:17 AM, Dan Williams wrote:
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
It's used to validate NVDIMM _DSM method and static namespace following NVDIMM specs...
sub-divide persistent memory capacity by partitioning the resulting block device(s).
I understand that it's a Linux design... Hmm, can the same expectation apply to PBLK? -- 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
