[PATCH v6 00/22] SMMUv3 Nested Stage Setup

From: Eric Auger
Date: Sun Mar 17 2019 - 13:22:48 EST

This series allows a virtualizer to program the nested stage mode.
This is useful when both the host and the guest are exposed with
an SMMUv3 and a PCI device is assigned to the guest using VFIO.

In this mode, the physical IOMMU must be programmed to translate
the two stages: the one set up by the guest (IOVA -> GPA) and the
one set up by the host VFIO driver as part of the assignment process
(GPA -> HPA).

On Intel, this is traditionnaly achieved by combining the 2 stages
into a single physical stage. However this relies on the capability
to trap on each guest translation structure update. This is possible
by using the VTD Caching Mode. Unfortunately the ARM SMMUv3 does
not offer a similar mechanism.

However, the ARM SMMUv3 architecture supports 2 physical stages! Those
were devised exactly with that use case in mind. Assuming the HW
implements both stages (optional), the guest now can use stage 1
while the host uses stage 2.

This assumes the virtualizer has means to propagate guest settings
to the host SMMUv3 driver. This series brings this VFIO/IOMMU
infrastructure. Those services are:
- bind the guest stage 1 configuration to the stream table entry
- propagate guest TLB invalidations
- bind MSI IOVAs
- propagate faults collected at physical level up to the virtualizer

This series largely reuses the user API and infrastructure originally
devised for SVA/SVM and patches submitted by Jacob, Yi Liu, Tianyu in
[1-2] and Jean-Philippe [3-4].

Best Regards


This series can be found at:

[1] [PATCH v5 00/23] IOMMU and VT-d driver support for Shared Virtual
Address (SVA)
[2] [RFC PATCH 0/8] Shared Virtual Memory virtualization for VT-d
(VFIO part)
[3] [v2,00/40] Shared Virtual Addressing for the IOMMU
[4] [PATCH v3 00/10] Shared Virtual Addressing for the IOMMU

v5 -> v6:
- Fix compilation issue when CONFIG_IOMMU_API is unset

v4 -> v5:
- fix bug reported by Vincent: fault handler unregistration now happens in
- IOMMU_FAULT_PERM_* moved outside of struct definition + small
uapi changes suggested by Kean-Philippe (except fetch_addr)
- iommu: introduce device fault report API: removed the PRI part.
- see individual logs for more details
- reset the ste abort flag on detach

v3 -> v4:
- took into account Alex, jean-Philippe and Robin's comments on v3
- rework of the smmuv3 driver integration
- add tear down ops for msi binding and PASID table binding
- fix S1 fault propagation
- put fault reporting patches at the beginning of the series following
Jean-Philippe's request
- update of the cache invalidate and fault API uapis
- VFIO fault reporting rework with 2 separate regions and one mmappable
segment for the fault queue
- moved to PATCH

v2 -> v3:
- When registering the S1 MSI binding we now store the device handle. This
addresses Robin's comment about discimination of devices beonging to
different S1 groups and using different physical MSI doorbells.
- Change the fault reporting API: use VFIO_PCI_DMA_FAULT_IRQ_INDEX to
set the eventfd and expose the faults through an mmappable fault region

v1 -> v2:
- Added the fault reporting capability
- asid properly passed on invalidation (fix assignment of multiple
- see individual change logs for more info

Eric Auger (13):
iommu: Introduce bind/unbind_guest_msi
iommu/smmuv3: Get prepared for nested stage support
iommu/smmuv3: Implement attach/detach_pasid_table
iommu/smmuv3: Implement cache_invalidate
dma-iommu: Implement NESTED_MSI cookie
iommu/smmuv3: Implement bind/unbind_guest_msi
iommu/smmuv3: Report non recoverable faults
vfio-pci: Add a new VFIO_REGION_TYPE_NESTED region type
vfio-pci: Register an iommu fault handler
vfio_pci: Allow to mmap the fault queue
vfio: Document nested stage control

Jacob Pan (4):
driver core: add per device iommu param
iommu: introduce device fault data
iommu: introduce device fault report API
iommu: Introduce attach/detach_pasid_table API

Jean-Philippe Brucker (2):
iommu/arm-smmu-v3: Link domains and devices
iommu/arm-smmu-v3: Maintain a SID->device structure

Liu, Yi L (3):
iommu: Introduce cache_invalidate API

Documentation/vfio.txt | 83 ++++
drivers/iommu/arm-smmu-v3.c | 581 ++++++++++++++++++++++++++--
drivers/iommu/dma-iommu.c | 145 ++++++-
drivers/iommu/iommu.c | 201 +++++++++-
drivers/vfio/pci/vfio_pci.c | 214 ++++++++++
drivers/vfio/pci/vfio_pci_intrs.c | 19 +
drivers/vfio/pci/vfio_pci_private.h | 18 +
drivers/vfio/pci/vfio_pci_rdwr.c | 73 ++++
drivers/vfio/vfio_iommu_type1.c | 158 ++++++++
include/linux/device.h | 3 +
include/linux/dma-iommu.h | 18 +
include/linux/iommu.h | 137 +++++++
include/uapi/linux/iommu.h | 233 +++++++++++
include/uapi/linux/vfio.h | 102 +++++
14 files changed, 1951 insertions(+), 34 deletions(-)
create mode 100644 include/uapi/linux/iommu.h