Re: [PATCH v6 10/25] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC ioctl

On 6/14/25 15:14, Nicolin Chen wrote:

Introduce a new IOMMUFD_CMD_HW_QUEUE_ALLOC ioctl for user space to allocate a HW QUEUE object for a vIOMMU specific HW-accelerated queue, e.g.:

• NVIDIA's Virtual Command Queue
• AMD vIOMMU's Command Buffer, Event Log Buffers, and PPR Log Buffers

Since this is introduced with NVIDIA's VCMDQs that access the guest memory in the physical address space, add an iommufd_hw_queue_alloc_phys() helper that will create an access object to the queue memory in the IOAS, to avoid the mappings of the guest memory from being unmapped, during the life cycle of the HW queue object.

Reviewed-by: Pranjal Shrivastavapraan@google.com Reviewed-by: Kevin Tiankevin.tian@intel.com Signed-off-by: Nicolin Chennicolinc@nvidia.com

Reviewed-by: Lu Baolu baolu.lu@linux.intel.com