iommu/s390: Tolerate repeat attach_dev calls

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Since commit 0286300e60 ("iommu: iommu_group_claim_dma_owner() must
always assign a domain") s390-iommu will get called to allocate multiple
unmanaged iommu domains for a vfio-pci device -- however the current
s390-iommu logic tolerates only one.  Recognize that multiple domains can
be allocated and handle switching between DMA or different iommu domain
tables during attach_dev.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20220519182929.581898-1-mjrosato@linux.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Matthew Rosato 2022-05-19 14:29:29 -04:00 • committed by Joerg Roedel

parent 0286300e60

commit fa7e9ecc5e

1 changed files with 12 additions and 3 deletions

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drivers/iommu/s390-iommu.c

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