[Qemu-devel] [RFC QEMU PATCH v3 00/10] Implement vNVDIMM for Xen HVM guest

[Haozhong Zhang]

This is the QEMU part patches that works with the associated Xen
patches to enable vNVDIMM support for Xen HVM domains. Xen relies on
QEMU to build guest NFIT and NVDIMM namespace devices, and allocate
guest address space for vNVDIMM devices.

All patches can be found at
  Xen:  https://github.com/hzzhan9/xen.git nvdimm-rfc-v3
  QEMU: https://github.com/hzzhan9/qemu.git xen-nvdimm-rfc-v3

Patch 1 is to avoid dereferencing the NULL pointer to non-existing
label data, as the Xen side support for labels is not implemented yet.

Patch 2 & 3 add a memory backend dedicated for Xen usage and a hotplug
memory region for Xen guest, in order to make the existing nvdimm
device plugging path work on Xen.

Patch 4 - 10 build and cooy NFIT from QEMU to Xen guest, when QEMU is
used as the Xen device model.


Haozhong Zhang (10):
  nvdimm: do not intiailize nvdimm->label_data if label size is zero
  hw/xen-hvm: create the hotplug memory region on Xen
  hostmem-xen: add a host memory backend for Xen
  nvdimm acpi: do not use fw_cfg on Xen
  hw/xen-hvm: initialize DM ACPI
  hw/xen-hvm: add function to copy ACPI into guest memory
  nvdimm acpi: copy NFIT to Xen guest
  nvdimm acpi: copy ACPI namespace device of vNVDIMM to Xen guest
  nvdimm acpi: do not build _FIT method on Xen
  hw/xen-hvm: enable building DM ACPI if vNVDIMM is enabled

 backends/Makefile.objs |   1 +
 backends/hostmem-xen.c | 108 ++++++++++++++++++++++++++
 backends/hostmem.c     |   9 +++
 hw/acpi/aml-build.c    |  10 ++-
 hw/acpi/nvdimm.c       |  79 ++++++++++++++-----
 hw/i386/pc.c           | 102 ++++++++++++++-----------
 hw/i386/xen/xen-hvm.c  | 204 ++++++++++++++++++++++++++++++++++++++++++++++++-
 hw/mem/nvdimm.c        |  10 ++-
 hw/mem/pc-dimm.c       |   6 +-
 include/hw/i386/pc.h   |   1 +
 include/hw/xen/xen.h   |  25 ++++++
 stubs/xen-hvm.c        |  10 +++
 12 files changed, 495 insertions(+), 70 deletions(-)
 create mode 100644 backends/hostmem-xen.c

-- 
2.11.0