iommu/vt-d: Unconditionally flush device TLB for pasid table updates

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The caching mode of an IOMMU is irrelevant to the behavior of the device
TLB. Previously, commit <304b3bde24> ("iommu/vt-d: Remove caching mode
check before device TLB flush") removed this redundant check in the
domain unmap path.

Checking the caching mode before flushing the device TLB after a pasid
table entry is updated is unnecessary and can lead to inconsistent
behavior.

Extends this consistency by removing the caching mode check in the pasid
table update path.

Suggested-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20240820030208.20020-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

...

This commit is contained in:

Lu Baolu 2024-09-02 10:27:20 +08:00 • committed by Joerg Roedel

parent ccb02b27bb

commit 1f5e307ca1

1 changed files with 3 additions and 9 deletions

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drivers/iommu/intel/pasid.c

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