| From: |
| Matthew Rosato <mjrosato-AT-linux.ibm.com> |
| To: |
| joro-AT-8bytes.org, will-AT-kernel.org, robin.murphy-AT-arm.com, gerald.schaefer-AT-linux.ibm.com, schnelle-AT-linux.ibm.com |
| Subject: |
| [PATCH v3 0/3] iommu/s390: add support for IOMMU passthrough |
| Date: |
| Fri, 24 Jan 2025 15:17:14 -0500 |
| Message-ID: |
| <20250124201717.348736-1-mjrosato@linux.ibm.com> |
| Cc: |
| hca-AT-linux.ibm.com, gor-AT-linux.ibm.com, agordeev-AT-linux.ibm.com, svens-AT-linux.ibm.com, borntraeger-AT-linux.ibm.com, farman-AT-linux.ibm.com, clegoate-AT-redhat.com, iommu-AT-lists.linux.dev, linux-kernel-AT-vger.kernel.org, linux-s390-AT-vger.kernel.org |
| Archive-link: |
| Article |
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
