Commit 4fa064b2 authored Nov 03, 2017 by Lu Baolu Committed by Alex Williamson Nov 03, 2017

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>

parent 973b5464

drivers/iommu/intel-svm.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -458,6 +458,8 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
		kfree_rcu(sdev, rcu);

		if (list_empty(&svm->devs)) {
		svm->iommu->pasid_table[svm->pasid].val = 0;
		wmb();

		idr_remove(&svm->iommu->pasid_idr, svm->pasid);
		if (svm->mm)