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
