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iommu/vt-d: Clear pasid table entry when memory unbound 

In intel_svm_unbind_mm(), pasid table entry must be cleared during
svm free. Otherwise, hardware may be set up with a wild pointer.

Suggested-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Lu Baolu 2017-11-03 10:51:34 -06:00 committed by Alex Williamson
parent 973b546451
commit 4fa064b26c
1 changed files with 2 additions and 0 deletions
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2
drivers/iommu/intel-svm.c
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@ -458,6 +458,8 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
kfree_rcu(sdev, rcu); kfree_rcu(sdev, rcu);
if (list_empty(&svm->devs)) { if (list_empty(&svm->devs)) {
svm->iommu->pasid_table[svm->pasid].val = 0;
wmb();
idr_remove(&svm->iommu->pasid_idr, svm->pasid); idr_remove(&svm->iommu->pasid_idr, svm->pasid);
if (svm->mm) if (svm->mm)