Re: [PATCH v4 02/11] iommufd: Introduce IOMMUFD_OBJ_VIOMMU and its related struct

On 2024/10/22 8:19, Nicolin Chen wrote:

• • @viommu_alloc: Allocate an iommufd_viommu on a physical IOMMU instance behind

• •            the @dev, as the set of virtualization resources shared/passed
    

• •            to user space IOMMU instance. And associate it with a nesting
    

• •            @parent_domain. The @viommu_type must be defined in the header
    

• •            include/uapi/linux/iommufd.h
    

• •            It is suggested to call iommufd_viommu_alloc() helper for
    

• •            a bundled allocation of the core and the driver structures,
    

• •            using the given @ictx pointer.
    

  • @pgsize_bitmap: bitmap of all possible supported page sizes
  • @owner: Driver module providing these ops
  • @identity_domain: An always available, always attachable identity

@@ -591,6 +601,10 @@ struct iommu_ops { void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid, struct iommu_domain *domain);

• struct iommufd_viommu *(*viommu_alloc)(

• struct device *dev, struct iommu_domain *parent_domain,
  

• struct iommufd_ctx *ictx, unsigned int viommu_type);
  

Is the vIOMMU object limited to a parent domain?

Thanks, baolu