[PATCH v5 0/7] Support attaching PASID to the blocked_domain

[Yi Liu <yi.l.liu@intel.com>]

During the review of iommufd pasid series, Kevin and Jason suggested
attaching PASID to the blocked domain hence replacing the usage of
remove_dev_pasid() op [1]. This makes sense as it makes the PASID path
aligned with the RID path which attaches the RID to the blocked_domain
when it is to be blocked. To do it, it requires passing the old domain
to the iommu driver. This has been done in [2].

This series makes the Intel iommu driver, ARM SMMUv3 driver and AMD iommu
driver support attaching PASID to the blocked domain. And in the end remove
the remove_dev_pasid op from iommu_ops.

[1] https://lore.kernel.org/linux-iommu/20240816130202.GB2032816@nvidia.com/
[2] https://lore.kernel.org/linux-iommu/20241108021406.173972-1-baolu.lu@linux.intel.com/

v5:
 - Fix an issue spotted by Baolu in patch 01 of v4. The new version lifts the
   group check to be the first check, hence it can ensure a valid iommu_ops
   returned by dev_iommu_ops(). Per this changes, it also removes the
   dev_has_iommu() check as it is duplicated with the group check. Due to the
   changes, drop the r-b tags on this patch.
 - Add Baolu's r-b tag.

v4: https://lore.kernel.org/linux-iommu/20241108120427.13562-1-yi.l.liu@intel.com/
 - Remove unnecessary braces in patch 02 (Vasant)
 - Minor tweaks to patch 01 and 03 (Kevin)
 - Add r-b tags from Jason, Vasant, Kevin

v3: https://lore.kernel.org/linux-iommu/20241104132033.14027-1-yi.l.liu@intel.com/
 - Add a patch to check remove_dev_pasid() in iommu_attach_device_pasid()
 - Split patch 01 of v2 into two patches, drop the r-b of this patch due the
   split.
 - Add AMD iommu blocked domain pasid support (Jason)
 - Remove the remove_dev_pasid op as all the iommu drivers that support pasid
   attach have supported attaching pasid to blocked domain.

v2: https://lore.kernel.org/linux-iommu/20241018055824.24880-1-yi.l.liu@intel.com/#t
 - Add Kevin's r-b
 - Adjust the order of patch 03 of v1, it should be the first patch (Baolu)

v1: https://lore.kernel.org/linux-iommu/20240912130653.11028-1-yi.l.liu@intel.com/

Regards,
	Yi Liu

Jason Gunthorpe (1):
  iommu/arm-smmu-v3: Make the blocked domain support PASID

Yi Liu (6):
  iommu: Prevent pasid attach if no ops->remove_dev_pasid
  iommu: Consolidate the ops->remove_dev_pasid usage into a helper
  iommu: Detaching pasid by attaching to the blocked_domain
  iommu/vt-d: Make the blocked domain support PASID
  iommu/amd: Make the blocked domain support PASID
  iommu: Remove the remove_dev_pasid op

 drivers/iommu/amd/iommu.c                   | 10 +++++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 +++----
 drivers/iommu/intel/iommu.c                 | 15 ++++++---
 drivers/iommu/iommu.c                       | 35 +++++++++++++--------
 include/linux/iommu.h                       |  5 ---
 5 files changed, 48 insertions(+), 29 deletions(-)

-- 
2.34.1