On 2023/8/1 16:07, tina.zhang wrote:
Hi Baolu,
Hi Tina,
Although this patch moves the domain reference pointer from a per-group structure to a per-device structure, the domain life-cycle is still expected to be managed per-group (i.e., iommu_domain_free() is called in iommu_group_release()). Is this what we expect?
The lifecycle of an iommu domain is independent of the lifecycle of the iommu group that it is attached to. The system domains, such as the default domain and the blocking domain, are allocated and managed by the iommu core. These domains are freed when the group is freed. However, any device driver can allocate its own iommu domains. The device driver can set/remove the domain to/from the RID or PASID of the device. Best regards, baolu
