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Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM
From: |
Dan Williams |
Subject: |
Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM |
Date: |
Mon, 12 Oct 2015 09:36:15 -0700 |
On Sun, Oct 11, 2015 at 9:33 PM, Xiao Guangrong
<address@hidden> wrote:
>
>
> On 10/11/2015 05:17 AM, Dan Williams wrote:
>>
>> On Sat, Oct 10, 2015 at 8:52 PM, Xiao Guangrong
>> <address@hidden> 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...
Static namespaces can be emitted without a label. Linux needs this to
support existing "label-less" bare metal NVDIMMs.
>> 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?
BLK-mode is a bit different as those namespaces have both configurable
sector-size and an optional BTT. It is possible to expect multiple
BLK namespaces per a given region with different settings.
- Re: [Qemu-devel] [PATCH v3 23/32] nvdimm: build ACPI NFIT table, (continued)
Re: [Qemu-devel] [PATCH v3 23/32] nvdimm: build ACPI NFIT table, Dan Williams, 2015/10/12
[Qemu-devel] [PATCH v3 25/32] nvdimm: build ACPI nvdimm devices, Xiao Guangrong, 2015/10/10
[Qemu-devel] [PATCH v3 32/32] nvdimm: add maintain info, Xiao Guangrong, 2015/10/10
Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Dan Williams, 2015/10/10
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Xiao Guangrong, 2015/10/12
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM,
Dan Williams <=
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Xiao Guangrong, 2015/10/12
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Dan Williams, 2015/10/13
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Xiao Guangrong, 2015/10/13
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Dan Williams, 2015/10/13
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Xiao Guangrong, 2015/10/14
- Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM, Dan Williams, 2015/10/14
[Qemu-devel] [PATCH v3 03/32] acpi: add aml_create_field, Xiao Guangrong, 2015/10/10
[Qemu-devel] [PATCH v3 14/32] pc-dimm: drop the prefix of pc-dimm, Xiao Guangrong, 2015/10/10