linux-kernel - [PATCH v2 0/3] iommu/s390: add support for IOMMU passthrough

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Message-ID: <20241213224941.571060-1-mjrosato@linux.ibm.com>
Date: Fri, 13 Dec 2024 17:49:38 -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 v2 0/3] 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.

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(-)

-- 
2.47.1