On 2022/3/21 16:04, Tian, Kevin wrote:
From: Lu Baolu <baolu...@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.
Indeed. Perhaps we could associate the SVA domain with the mm->pasid and add a user counter inside the domain. Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
