[Qemu-devel] [PATCH qemu v14 00/18] spapr: vfio: Enable Dynamic DMA windows (DDW)

[Alexey Kardashevskiy]

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 the upstream QEMU.

This implements comments from v13; another change is the patches are
smaller and VFIO code is slightly better separated from sPAPR and common code.

This includes "vmstate: Define VARRAY with VMS_ALLOC" as the patchset needs
it and it has been posted separately but has not been neither accepted
nor rejected so far.

Please comment. Thanks!




Alexey Kardashevskiy (18):
  memory: Fix IOMMU replay base address
  vmstate: Define VARRAY with VMS_ALLOC
  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: Finish renaming vfio_accel to need_vfio
  spapr_iommu: Realloc table during migration
  spapr_iommu: Migrate full state
  spapr_iommu: Add root memory region
  spapr_pci: Reset DMA config on PHB reset
  memory: Add reporting of supported page sizes
  vfio: Check that IOMMU MR translates to system address space
  vfio: spapr: Add SPAPR IOMMU v2 support (DMA memory preregistering)
  spapr_pci: Add and export DMA resetting helper
  vfio: Add host side IOMMU capabilities
  spapr_iommu, vfio, memory: Notify IOMMU about starting/stopping being
    used by VFIO
  vfio/spapr: Use VFIO_SPAPR_TCE_v2_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          | 202 ++++++++++++++++++++++------
 hw/ppc/spapr_pci.c            | 125 +++++++++++++++---
 hw/ppc/spapr_rtas_ddw.c       | 300 ++++++++++++++++++++++++++++++++++++++++++
 hw/ppc/spapr_vio.c            |   8 +-
 hw/vfio/Makefile.objs         |   1 +
 hw/vfio/common.c              | 241 +++++++++++++++++++++++++++------
 hw/vfio/prereg.c              | 137 +++++++++++++++++++
 include/exec/memory.h         |  22 +++-
 include/hw/pci-host/spapr.h   |  15 +++
 include/hw/ppc/spapr.h        |  31 ++++-
 include/hw/vfio/vfio-common.h |  14 +-
 include/migration/vmstate.h   |  10 ++
 memory.c                      |  17 ++-
 target-ppc/kvm_ppc.h          |   2 +-
 trace-events                  |  10 +-
 17 files changed, 1018 insertions(+), 125 deletions(-)
 create mode 100644 hw/ppc/spapr_rtas_ddw.c
 create mode 100644 hw/vfio/prereg.c

-- 
2.5.0.rc3