Re: [PATCH v2 1/2] iommu: Undo pasid attachment only for the devices that have succeeded

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On 3/28/24 8:29 PM, Yi Liu wrote:
There is no error handling now in __iommu_set_group_pasid(), it relies on
its caller to loop all the devices to undo the pasid attachment. This is
not self-contained and has drawbacks. It would result in unnecessary
remove_dev_pasid() calls on the devices that have not been attached to the
new domain. But the remove_dev_pasid() callback would get the new domain
from the group->pasid_array. So for such devices, the iommu driver won't
find the attachment under the domain, hence unable to do cleanup. This may
not be a real problem today. But it depends on the implementation of the
underlying iommu driver. e.g. the intel iommu driver would warn for such
devices. Such warnings are unnecessary.

To solve the above problem, it is necessary to handle the error within
__iommu_set_group_pasid(). It only loops the devices that have attached
to the new domain, and undo it.

Fixes: 16603704559c ("iommu: Add attach/detach_dev_pasid iommu interfaces")
Suggested-by: Jason Gunthorpe<jgg@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe<jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian<kevin.tian@xxxxxxxxx>
Signed-off-by: Yi Liu<yi.l.liu@xxxxxxxxx>

Reviewed-by: Lu Baolu <>

Best regards,

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