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    SubjectRE: [PATCH v7 06/10] iommu/sva: Refactoring iommu_sva_bind/unbind_device()
    Date
    > From: Lu Baolu <baolu.lu@linux.intel.com>
    > Sent: Thursday, May 19, 2022 3:21 PM
    >
    > The existing iommu SVA interfaces are implemented by calling the SVA
    > specific iommu ops provided by the IOMMU drivers. There's no need for
    > any SVA specific ops in iommu_ops vector anymore as we can achieve
    > this through the generic attach/detach_dev_pasid domain ops.

    set/block_pasid_dev, to be consistent.

    > +
    > + mutex_lock(&iommu_sva_lock);
    > + /* Search for an existing domain. */
    > + domain = iommu_get_domain_for_dev_pasid(dev, mm->pasid);
    > + if (domain) {
    > + sva_domain = to_sva_domain(domain);
    > + refcount_inc(&sva_domain->bond.users);
    > + goto out_success;
    > + }
    > +

    why would one device/pasid be bound to a mm more than once?

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