[PATCH v3 0/3] iommu/s390: add support for IOMMU passthrough

[Matthew Rosato <mjrosato@linux.ibm.com>]

This series introduces the ability for certain devices on s390 to bypass
a layer of IOMMU via the iommu.passthrough=1 option.  In order to enable
this, the concept of an identity domain is added to s390-iommu.  On s390,
IOMMU passthrough is only allowed if indicated via a special bit in s390
CLP data for the associated device group, otherwise we must fall back to
dma-iommu.

Changes for v3:
- Rebase onto 6.13
- fixed bus_dma_region size (Niklas) 

Changes for v2:
- Remove ARCH_HAS_PHYS_TO_DMA, use bus_dma_region
- Remove use of def_domain_type, use 1 of 2 ops chosen at init

Matthew Rosato (3):
  s390/pci: check for relaxed translation capability
  s390/pci: store DMA offset in bus_dma_region
  iommu/s390: implement iommu passthrough via identity domain

 arch/s390/include/asm/pci.h     |  2 +-
 arch/s390/include/asm/pci_clp.h |  4 +-
 arch/s390/pci/pci.c             |  6 ++-
 arch/s390/pci/pci_bus.c         | 18 +++++++
 arch/s390/pci/pci_clp.c         |  1 +
 drivers/iommu/s390-iommu.c      | 95 +++++++++++++++++++++++++--------
 6 files changed, 99 insertions(+), 27 deletions(-)

-- 
2.48.1