When a present pasid entry is disassembled, all kinds of pasid related caches need to be flushed. But when a pasid entry is not being used (PRESENT bit not set), we don't need to do this. Check the PRESENT bit in intel_pasid_tear_down_entry() and avoid flushing caches if it's not set.
Signed-off-by: Lu Baolu <baolu...@linux.intel.com> --- drivers/iommu/intel/pasid.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c index 07531e5edfa2..9fb3d3e80408 100644 --- a/drivers/iommu/intel/pasid.c +++ b/drivers/iommu/intel/pasid.c @@ -493,6 +493,9 @@ void intel_pasid_tear_down_entry(struct intel_iommu *iommu, struct device *dev, if (WARN_ON(!pte)) return; + if (!(pte->val[0] & PASID_PTE_PRESENT)) + return; + did = pasid_get_domain_id(pte); intel_pasid_clear_entry(dev, pasid, fault_ignore); -- 2.25.1