Re: [PATCH v2 04/19] iommufd: Allow pt_id to carry viommu_id for IOMMU_HWPT_ALLOC

On Tue, Aug 27, 2024 at 09:59:41AM -0700, Nicolin Chen wrote:

Now a VIOMMU can wrap a shareable nested parent HWPT. So, it can act like
a nested parent HWPT to allocate a nested HWPT.

Support that in the IOMMU_HWPT_ALLOC ioctl handler, and update its kdoc.

Also, associate a viommu to an allocating nested HWPT.

Signed-off-by: Nicolin Chen <redacted>
---
 drivers/iommu/iommufd/hw_pagetable.c    | 24 ++++++++++++++++++++++--
 drivers/iommu/iommufd/iommufd_private.h |  1 +
 include/uapi/linux/iommufd.h            | 12 ++++++------
 3 files changed, 29 insertions(+), 8 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason