On 07/31/2014 07:34 PM, Alexey Kardashevskiy wrote: > At the moment sPAPR PHB supports only a single 32bit window > which is normally 1..2GB which is not enough for high performance devices. > > PAPR spec enables creating an additional window(s) to support 64bit > DMA and bigger page sizes. > > This patchset adds DDW support for pseries. The host kernel changes are > required. > > This was tested on POWER8 system which allows one additional DMA window > which is mapped at 0x800.0000.0000.0000 and supports 16MB pages. > Existing guests check for DDW capabilities in PHB's device tree and if it > is present, they request for an additional window and map entire guest RAM > using H_PUT_TCE/... hypercalls once at boot time and switch to direct DMA > operations. > > TCE tables still may be big enough for guests backed with 64K pages but they > are reasonably small for guests backed by 16MB pages. > > Please comment. Thanks!
Alexander Graf, ping! > Alexey Kardashevskiy (10): > qom: Make object_child_foreach safe for objects removal > spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows > spapr_pci: Make find_phb()/find_dev() public > spapr_iommu: Make spapr_tce_find_by_liobn() public > linux headers update for DDW > spapr_rtas: Add Dynamic DMA windows (DDW) RTAS calls support > spapr: Add "ddw" machine option > spapr_pci: Enable DDW > spapr_pci_vfio: Enable DDW > vfio: Enable DDW ioctls to VFIO IOMMU driver > > hw/misc/vfio.c | 4 + > hw/ppc/Makefile.objs | 3 + > hw/ppc/spapr.c | 15 +++ > hw/ppc/spapr_iommu.c | 8 +- > hw/ppc/spapr_pci.c | 87 +++++++++++-- > hw/ppc/spapr_pci_vfio.c | 75 +++++++++++ > hw/ppc/spapr_rtas_ddw.c | 296 > ++++++++++++++++++++++++++++++++++++++++++++ > include/hw/pci-host/spapr.h | 27 ++++ > include/hw/ppc/spapr.h | 7 +- > linux-headers/linux/vfio.h | 37 +++++- > qom/object.c | 4 +- > trace-events | 4 + > vl.c | 4 + > 13 files changed, 552 insertions(+), 19 deletions(-) > create mode 100644 hw/ppc/spapr_rtas_ddw.c > -- Alexey
