Re: [Patch V2 0/2] iommu/arm-smmu: Fix races in iommu domain/group creation

[Will Deacon]

On Fri, Jun 18, 2021 at 02:00:35AM +0530, Ashish Mhetre wrote:
> Multiple iommu domains and iommu groups are getting created for the devices
> sharing same SID. It is expected for devices sharing same SID to be in same
> iommu group and same iommu domain.
> This is leading to context faults when one device is accessing IOVA from
> other device which shouldn't be the case for devices sharing same SID.
> Fix this by protecting iommu domain and iommu group creation with mutexes.

Robin -- any chance you could take a look at these, please? You had some
comments on the first version which convinced me that they are needed,
but I couldn't tell whether you wanted to solve this a different way or not.

Cheers,

Will