From: Lu Baolu <baolu.lu@linux.intel.com>
Date: Fri, 3 Nov 2017 10:51:34 -0600
Subject: iommu/vt-d: Clear pasid table entry when memory unbound
Git-commit: 4fa064b26c2eb9e1c38460ba327765dff16a4b14
Patch-mainline: v4.15-rc1
References: bsc#1087214
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>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/intel-svm.c | 2 ++
1 file changed, 2 insertions(+)
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)