Re: [Xen-devel] [PATCH 0/4] add support for vNVDIMM

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Zhang, Haozhong
> Sent: Tuesday, December 29, 2015 7:32 PM
> 
> This patch series is the Xen part patch to provide virtual NVDIMM to
> guest. The corresponding QEMU patch series is sent separately with the
> title "[PATCH 0/2] add vNVDIMM support for Xen".
> 
> * Background
> 
>  NVDIMM (Non-Volatile Dual In-line Memory Module) is going to be
>  supported on Intel's platform. NVDIMM devices are discovered via ACPI
>  and configured by _DSM method of NVDIMM device in ACPI. Some
>  documents can be found at
>  [1] ACPI 6: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
>  [2] NVDIMM Namespace: http://pmem.io/documents/NVDIMM_Namespace_Spec.pdf
>  [3] DSM Interface Example:
> http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
>  [4] Driver Writer's Guide:
> http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf
> 
>  The upstream QEMU (commits 5c42eef ~ 70d1fb9) has added support to
>  provide virtual NVDIMM in PMEM mode, in which NVDIMM devices are
>  mapped into CPU's address space and are accessed via normal memory
>  read/write and three special instructions (clflushopt/clwb/pcommit).
> 
>  This patch series and the corresponding QEMU patch series enable Xen
>  to provide vNVDIMM devices to HVM domains.
> 
> * Design
> 
>  Supporting vNVDIMM in PMEM mode has three requirements.
> 

Although this design is about vNVDIMM, some background of how pNVDIMM
is managed in Xen would be helpful to understand the whole design since
in PMEM mode you need map pNVDIMM into GFN addr space so there's
a matter of how pNVDIMM is allocated.

Thanks
Kevin

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