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 <[email protected]>
> ---
Tested in conjuction with
https://lore.kernel.org/kvm/[email protected]/
Along with that patch, vfio{-pci,-ap,-ccw} on s390x for -next seem happy
again.