Messages in this thread | | | From | Lu Baolu <> | Subject | [PATCH v4 0/4] iommu/vt-d: Force snooping improvement | Date | Sun, 8 May 2022 20:35:21 +0800 |
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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: v4: - Flush caches after changing PGSNP bit in the right way.
v3: - https://lore.kernel.org/linux-iommu/20220506052727.1689687-1-baolu.lu@linux.intel.com/ - 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@linux.intel.com/ - 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@linux.intel.com - 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 | 45 +++++++++++++++++-- 4 files changed, 99 insertions(+), 39 deletions(-)
-- 2.25.1
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