linux-kernel - [PATCH 0/6] iommu/s390: add support for IOMMU passthrough

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Message-ID: <20241209192403.107090-1-mjrosato@linux.ibm.com>
Date: Mon,  9 Dec 2024 14:23:57 -0500
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: joro@...tes.org, will@...nel.org, robin.murphy@....com,
        gerald.schaefer@...ux.ibm.com, schnelle@...ux.ibm.com
Cc: hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, borntraeger@...ux.ibm.com, farman@...ux.ibm.com,
        clegoate@...hat.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 0/6] iommu/s390: add support for IOMMU passthrough

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.

Matthew Rosato (6):
  s390/pci: check for relaxed translation capability
  s390: enable ARCH_HAS_PHYS_TO_DMA
  iommu/s390: implement iommu passthrough via identity domain
  iommu: add routine to check strict setting
  iommu: document missing def_domain_type return
  iommu/s390: implement def_domain_type

 arch/s390/Kconfig                  |  1 +
 arch/s390/include/asm/device.h     | 12 ++++++
 arch/s390/include/asm/dma-direct.h | 14 +++++++
 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            |  2 +
 arch/s390/pci/pci_clp.c            |  1 +
 drivers/iommu/iommu.c              |  5 +++
 drivers/iommu/s390-iommu.c         | 65 ++++++++++++++++++++++++++++--
 include/linux/iommu.h              |  2 +
 11 files changed, 107 insertions(+), 7 deletions(-)
 create mode 100644 arch/s390/include/asm/device.h
 create mode 100644 arch/s390/include/asm/dma-direct.h

-- 
2.47.0