iommu/vt-d: Avoid unnecessary cache flush in pasid entry teardown
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: NLu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210320025415.641201-6-baolu.lu@linux.intel.comSigned-off-by: NJoerg Roedel <jroedel@suse.de>
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