[Qemu-devel] [PATCH qemu v13 00/16] spapr: vfio: Enable Dynamic DMA windows (DDW)

[Alexey Kardashevskiy <aik@ozlabs.ru>]

Each Partitionable Endpoint (IOMMU group) has an address range on a PCI bus
where devices are allowed to do DMA. These ranges are called DMA windows.
By default, there is a single DMA window, 1 or 2GB big, mapped at zero
on a PCI bus.

PAPR defines a DDW RTAS API which allows pseries guests
querying the hypervisor about DDW support and capabilities (page size mask
for now). A pseries guest may request an additional (to the default)
DMA windows using this RTAS API.
The existing pseries Linux guests request an additional window as big as
the guest RAM and map the entire guest window which effectively creates
direct mapping of the guest memory to a PCI bus.

This patchset reworks PPC64 IOMMU code and adds necessary structures
to support big windows on pseries.

This patchset is based on git://github.com/dgibson/qemu.git ,
tag ppc-for-2.6-20160229 plus just recently posted
"Allow EEH on spapr-pci-host-bridge devices" series.

The series was completely reworked so there is no changelog.


Please comment. Thanks!


Alexey Kardashevskiy (16):
  memory: Fix IOMMU replay base address
  spapr_pci: Move DMA window enablement to a helper
  spapr_iommu: Move table allocation to helpers
  spapr_iommu: Introduce "enabled" state for TCE table
  spapr_iommu: Add root memory region
  spapr_pci: Reset DMA config on PHB reset
  vfio, memory: Notify IOMMU about starting/stopping being used by VFIO
  memory: Add reporting of supported page sizes
  vfio: Generalize IOMMU memory listener
  vfio: Use different page size for different IOMMU types
  vfio: spapr: Add SPAPR IOMMU v2 support (DMA memory preregistering)
  vmstate: Define VARRAY with VMS_ALLOC
  spapr_iommu: Remove need_vfio flag from sPAPRTCETable
  spapr_pci: Add and export DMA resetting helper
  vfio: Move iova_pgsizes from container to guest IOMMU
  spapr_pci/spapr_pci_vfio: Support Dynamic DMA Windows (DDW)

 hw/ppc/Makefile.objs          |   1 +
 hw/ppc/spapr.c                |   7 +-
 hw/ppc/spapr_iommu.c          | 187 ++++++++++++++++++++------
 hw/ppc/spapr_pci.c            | 119 +++++++++++++---
 hw/ppc/spapr_rtas_ddw.c       | 306 ++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_vio.c            |   9 +-
 hw/vfio/Makefile.objs         |   1 +
 hw/vfio/common.c              | 213 ++++++++++++++++++++++-------
 hw/vfio/prereg.c              | 138 +++++++++++++++++++
 include/exec/memory.h         |  13 ++
 include/hw/pci-host/spapr.h   |  15 +++
 include/hw/ppc/spapr.h        |  35 +++--
 include/hw/vfio/vfio-common.h |  16 ++-
 include/migration/vmstate.h   |  10 ++
 memory.c                      |   9 ++
 trace-events                  |  10 +-
 16 files changed, 960 insertions(+), 129 deletions(-)
 create mode 100644 hw/ppc/spapr_rtas_ddw.c
 create mode 100644 hw/vfio/prereg.c

-- 
2.5.0.rc3