iommu/s390: implement iommu passthrough via identity domain

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Enabled via the kernel command-line 'iommu.passthrough=1' option.

Introduce the concept of identity domains to s390-iommu, which relies on
the bus_dma_region to offset identity mappings to the start of the DMA
aperture advertized by CLP.

Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20250212213418.182902-5-mjrosato@linux.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Matthew Rosato 2025-02-12 16:34:18 -05:00 • committed by Joerg Roedel

parent 0ed5967a0a

commit 64af12c6ec

1 changed files with 72 additions and 23 deletions

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drivers/iommu/s390-iommu.c

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