[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 0/4] add support for vNVDIMM
On Wed, 20 Jan 2016, Tian, Kevin wrote: > > 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. Yes, some background would be very helpful. Given that there are so many moving parts on this (Xen, the Dom0 kernel, QEMU, hvmloader, libxl) I suggest that we start with a design document for this feature. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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