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authorLu Baolu <baolu.lu@linux.intel.com>2017-11-03 10:51:34 -0600
committerAlex Williamson <alex.williamson@redhat.com>2017-11-03 10:51:34 -0600
commit4fa064b26c2eb9e1c38460ba327765dff16a4b14 (patch)
treedad10948cb5ed2933375afbee03d29d25786c76e /drivers/iommu
parent973b546451fdf11e518cc96d1b137af893a38db5 (diff)
downloadlinux-4fa064b26c2eb9e1c38460ba327765dff16a4b14.tar.bz2
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>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-svm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 43280ca282df..ed1cf7c5a43b 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -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)