[PATCH v3 0/4] iommu/vt-d: Force snooping improvement

[Lu Baolu]

Hi folks,

Previously, the IOMMU capability of enforcing cache coherency was queried
through iommu_capable(IOMMU_CAP_CACHE_COHERENCY). This is a global
capability, hence the IOMMU driver reports support for this capability
only when all IOMMUs in the system has this support.

Commit 6043257b1de06 ("iommu: Introduce the domain op
enforce_cache_coherency()") converts this into a per-domain test-and-set
option, and the previous iommu_capable(IOMMU_CAP_CACHE_COHERENCY) is
deprecated.

This is a follow-up series which improves the Intel IOMMU driver to
support the per-domain scheme better.

Best regards,
baolu

Change log:
v3:
 - Hold the device_domain_lock when check and set force snooping.
 - Refind the commit messages.

v2:
 - https://lore.kernel.org/linux-iommu/20220505010710.1477739-1-baolu.lu@xxxxxxxxxxxxxxx/
 - Check whether force_snooping has already been set in
   intel_iommu_enforce_cache_coherency().
 - Set PGSNP pasid bit field during domain attaching if forcing_snooping
   is set.
 - Remove redundant list_empty() checks.
 - Add dmar_domain->set_pte_snp and set it if force snooping is enforced
   on a domain with 2nd-level translation.

v1:
 - https://lore.kernel.org/linux-iommu/20220501112434.874236-1-baolu.lu@xxxxxxxxxxxxxxx
 - Initial post.

Lu Baolu (4):
  iommu/vt-d: Block force-snoop domain attaching if no SC support
  iommu/vt-d: Check domain force_snooping against attached devices
  iommu/vt-d: Remove domain_update_iommu_snooping()
  iommu/vt-d: Remove hard coding PGSNP bit in PASID entries

 include/linux/intel-iommu.h |  1 +
 drivers/iommu/intel/pasid.h |  2 +
 drivers/iommu/intel/iommu.c | 90 ++++++++++++++++++++++---------------
 drivers/iommu/intel/pasid.c | 26 +++++++++--
 4 files changed, 80 insertions(+), 39 deletions(-)

-- 
2.25.1