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From: Xiao Guangrong <guangrong.xiao@linux.intel.com>
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Date: Tue, 13 Oct 2015 13:49:01 +0800
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Subject: Re: [Qemu-devel] [PATCH v3 00/32] implement vNVDIMM
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To: Dan Williams <dan.j.williams@intel.com>
Cc: ehabkost@redhat.com, KVM list <kvm@vger.kernel.org>, "Michael S. Tsirkin" <mst@redhat.com>, Gleb Natapov <gleb@kernel.org>, mtosatti@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, imammedo@redhat.com, Paolo Bonzini <pbonzini@redhat.com>, rth@twiddle.net



On 10/13/2015 11:38 AM, Dan Williams wrote:
> On Mon, Oct 12, 2015 at 8:14 PM, Xiao Guangrong
> <guangrong.xiao@linux.intel.com> wrote:
>> On 10/13/2015 12:36 AM, Dan Williams wrote:
>>> Static namespaces can be emitted without a label.  Linux needs this to
>>> support existing "label-less" bare metal NVDIMMs.
>>
>>
>> This is Linux specific? As i did not see it has been documented in the
>> spec...
>
> I expect most NVDIMMs, especially existing ones available today, do
> not have a label area.  This is not Linux specific and ACPI 6 does not
> specify a label area, only the Intel DSM Interface Example.
>

Yup, label data is accessed via DSM interface, the spec I mentioned
is Intel DSM Interface Example.

However, IIRC Linux NVDIMM driver refused to use the device if no
DSM GET_LABEL support, are you going to update it?