On Thu, 19 May 2022 14:03:48 -0300
Jason Gunthorpe <j...@nvidia.com> wrote:
> Since asserting dma ownership now causes the group to have its DMA blocked
> the iommu layer requires a working iommu. This means the dma_owner APIs
> cannot be used on the fake groups that VFIO creates. Test for this and
> avoid calling them.
>
> Otherwise asserting dma ownership will fail for VFIO mdev devices as a
> BLOCKING iommu_domain cannot be allocated due to the NULL iommu ops.
>
> Fixes: 0286300e6045 ("iommu: iommu_group_claim_dma_owner() must always assign
> a domain")
> Reported-by: Eric Farman <far...@linux.ibm.com>
> Tested-by: Eric Farman <far...@linux.ibm.com>
> Signed-off-by: Jason Gunthorpe <j...@nvidia.com>
> ---
> drivers/vfio/vfio.c | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)
Applied to vfio next branch for v5.19. Thanks,
Alex
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