On 5/19/22 2:29 PM, Matthew Rosato wrote:
Since commit 0286300e6045 ("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@xxxxxxxxxxxxx>
---
Tested in conjuction with
https://lore.kernel.org/kvm/0-v1-9cfc47edbcd4+13546-vfio_dma_owner_fix_jgg@xxxxxxxxxx/
Along with that patch, vfio{-pci,-ap,-ccw} on s390x for -next seem happy
again.
