RE: [PATCH v5 13/29] iommufd/viommu: Introduce IOMMUFD_OBJ_HW_QUEUE and its related struct

From: Nicolin Chen nicolinc@nvidia.com Sent: Sunday, May 18, 2025 11:22 AM

+enum iommufd_viommu_flags {

• /*

• * The HW does not go through an address translation table but
  

reads the

• * physical address space directly: iommufd core should pin the
  

physical

• * pages backing the queue memory that's allocated for the HW
  

QUEUE, and

• * ensure those physical pages are contiguous in the physical space.
  

• */
  

• IOMMUFD_VIOMMU_FLAG_HW_QUEUE_READS_PA = 1 << 0,

+};

The queue itself doesn't read an address.

What about 'QUEUE_BASE_PA'?

Reviewed-by: Kevin Tian kevin.tian@intel.com