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SubjectRE: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid_dev in SVA interfaces
Date
> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Sunday, March 20, 2022 2:40 PM
> +struct iommu_sva *
> +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void
> *drvdata)
> +{
> + int ret = -EINVAL;
> + struct iommu_sva *handle;
> + struct iommu_domain *domain;
> +
> + handle = kzalloc(sizeof(*handle), GFP_KERNEL);
> + if (!handle)
> + return ERR_PTR(-ENOMEM);
> +
> + ret = iommu_sva_alloc_pasid(mm, 1, (1U << dev->iommu->pasid_bits)
> - 1);
> + if (ret)
> + goto out;
> +
> + domain = iommu_sva_domain_alloc(dev);
> + if (!domain) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + domain->sva_cookie = mm;

one domain can be attached by multiple devices, so this should not be
a blind alloc.

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