Messages in this thread Patch in this message | | | From | Lu Baolu <> | Subject | [PATCH 3/3] iommu/vt-d: Clear pasid table entry when memory unbound | Date | Thu, 19 Oct 2017 08:39:16 +0800 |
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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> --- 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 43280ca..ed1cf7c 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) -- 2.7.4
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