[PATCH v2 0/7] iommu/vt-d: Add domain_alloc_paging support

[Lu Baolu <baolu.lu@linux.intel.com>]

The Intel iommu driver will now use the domain_alloc_paging callback and
remove the legacy domain_alloc callback. This ensures that a valid
device pointer is provided whenever a paging domain is allocated, and
all dmar_domain attributes can be set up at the time of allocation.

Both first-stage and second-stage page tables can be used for a paging
domain. Unless IOMMU_HWPT_ALLOC_NEST_PARENT or
IOMMU_HWPT_ALLOC_DIRTY_TRACKING is specified during paging domain
allocation, this driver will try to use first-stage page tables if the
hardware is capable. This is assuming that the first-stage page table is
compatible with both the host and guest kernels.

The whole series is also available on GitHub:
https://github.com/LuBaolu/intel-iommu/commits/vtd-domain_alloc_paging-v2

Please help review and comment.

Change log:

v2:
 - Make prepare_domain_attach_device() a specific helper to check
   whether a paging domain is compatible with the iommu hardware
   capability.
 - Rename prepare_domain_attach_device() to paging_domain_compatible()
   to make it more meaningful.

v1: https://lore.kernel.org/linux-iommu/20241011042722.73930-1-baolu.lu@linux.intel.com/

Lu Baolu (7):
  iommu/vt-d: Add domain_alloc_paging support
  iommu/vt-d: Remove unused domain_alloc callback
  iommu/vt-d: Enhance compatibility check for paging domain attach
  iommu/vt-d: Remove domain_update_iommu_cap()
  iommu/vt-d: Remove domain_update_iommu_superpage()
  iommu/vt-d: Refactor first_level_by_default()
  iommu/vt-d: Refine intel_iommu_domain_alloc_user()

 drivers/iommu/intel/iommu.h  |   4 +-
 drivers/iommu/intel/iommu.c  | 328 +++++++----------------------------
 drivers/iommu/intel/nested.c |   2 +-
 drivers/iommu/intel/pasid.c  |  28 +--
 4 files changed, 64 insertions(+), 298 deletions(-)

-- 
2.43.0