On Wed, Feb 12, 2025 at 04:34:14PM -0500, Matthew Rosato wrote: > 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 v5: > - Fixup error checking for bus_dma_region size > - Add review/test tags > > 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 | 25 ++++++ > arch/s390/pci/pci_clp.c | 1 + > arch/s390/pci/pci_sysfs.c | 11 +-- > drivers/iommu/s390-iommu.c | 138 ++++++++++++++++++++++++++------ > 8 files changed, 168 insertions(+), 67 deletions(-) Applied, thanks.
