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

[Baolu Lu]

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 Shrivastava<praan at google.com>
> Reviewed-by: Kevin Tian<kevin.tian at intel.com>
> Signed-off-by: Nicolin Chen<nicolinc at nvidia.com>

Reviewed-by: Lu Baolu <baolu.lu at linux.intel.com>