[PATCH v2 5/5] iommu/vt-d: Avoid unnecessary cache flush in pasid entry teardown

[Lu Baolu]

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 dd69df5a188a..7a73385edcc0 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -502,6 +502,9 @@ 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