| 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 v4 0/4] iommu/s390: add support for IOMMU passthrough |
| Date: |
| Fri, 07 Feb 2025 15:53:31 -0500 |
| Message-ID: |
| <20250207205335.473946-1-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, jgg-AT-nvidia.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 v4:
- Additional patch to handle IOAT registration within s390-iommu. This
fixes an issue with re-registration of identity domain during events
like zpci_hot_reset_device
- Fixup page alignment for bus_dma_region setup
- Dropped a few review/test tags due to above changes
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 (4):
s390/pci: check for relaxed translation capability
s390/pci: store DMA offset in bus_dma_region
iommu/s390: handle IOAT registration based on domain
iommu/s390: implement iommu passthrough via identity domain
arch/s390/include/asm/pci.h | 4 +-
arch/s390/include/asm/pci_clp.h | 4 +-
arch/s390/kvm/pci.c | 17 +---
arch/s390/pci/pci.c | 35 ++++----
arch/s390/pci/pci_bus.c | 18 +++++
arch/s390/pci/pci_clp.c | 1 +
arch/s390/pci/pci_sysfs.c | 11 +--
drivers/iommu/s390-iommu.c | 138 ++++++++++++++++++++++++++------
8 files changed, 161 insertions(+), 67 deletions(-)
--
2.48.1
