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 latest upstream.
This includes "vmstate: Define VARRAY with VMS_ALLOC" as it has been accepted
but has not been merged to upstream yet.
Please comment. Thanks!
Paolo, I did cc: you on this because of 02/19 and 03/19, would be great to
get an opinion as the rest of the series relies on it to do
vfio-pci hot _un_plug properly. Thanks!
Alexey Kardashevskiy (19):
vfio: Delay DMA address space listener release
memory: Call region_del() callbacks on memory listener unregistering
memory: Fix IOMMU replay base address
vmstate: Define VARRAY with VMS_ALLOC
vfio: Check that IOMMU MR translates to system address space
spapr_pci: Use correct DMA LIOBN when composing the device tree
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: 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: spapr: Add DMA memory preregistering (SPAPR IOMMU v2)
spapr_pci: Add and export DMA resetting helper
vfio: Add host side DMA window capabilities
spapr_iommu, vfio, memory: Notify IOMMU about starting/stopping being
used by VFIO
vfio/spapr: Create DMA window dynamically (SPAPR IOMMU v2)
spapr_pci/spapr_pci_vfio: Support Dynamic DMA Windows (DDW)
hw/ppc/Makefile.objs | 1 +
hw/ppc/spapr.c | 5 +
hw/ppc/spapr_iommu.c | 228 ++++++++++++++++++++++++------
hw/ppc/spapr_pci.c | 96 +++++++++----
hw/ppc/spapr_rtas_ddw.c | 292 ++++++++++++++++++++++++++++++++++++++
hw/ppc/spapr_vio.c | 8 +-
hw/vfio/Makefile.objs | 1 +
hw/vfio/common.c | 319 +++++++++++++++++++++++++++++++++++-------
hw/vfio/prereg.c | 137 ++++++++++++++++++
include/exec/memory.h | 22 ++-
include/hw/pci-host/spapr.h | 10 +-
include/hw/ppc/spapr.h | 31 +++-
include/hw/vfio/vfio-common.h | 21 ++-
include/migration/vmstate.h | 10 ++
memory.c | 64 ++++++++-
target-ppc/kvm_ppc.h | 2 +-
trace-events | 12 +-
17 files changed, 1120 insertions(+), 139 deletions(-)
create mode 100644 hw/ppc/spapr_rtas_ddw.c
create mode 100644 hw/vfio/prereg.c