iommu/vt-d: Flush cache for PASID table before using it

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[ Upstream commit 22d169bdd2 ]

When writing the address of a freshly allocated zero-initialized PASID
table to a PASID directory entry, do that after the CPU cache flush for
this PASID table, not before it, to avoid the time window when this
PASID table may be already used by non-coherent IOMMU hardware while
its contents in RAM is still some random old data, not zero-initialized.

Fixes: 194b3348bd ("iommu/vt-d: Fix PASID directory pointer coherency")
Signed-off-by: Dmytro Maluka <dmaluka@chromium.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20251221123508.37495-1-dmaluka@chromium.org
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Dmytro Maluka 2026-01-22 09:48:52 +08:00 • committed by Greg Kroah-Hartman

parent 53336a8114

commit 36244dfd38

1 changed files with 4 additions and 3 deletions

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drivers/iommu/intel/pasid.c

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