[PATCH 03/10] iommu/vt-d: Reject SVM bind for failed capability check

Jacob Pan
2019-11-15T23:05:18Z

Add a check during SVM bind to ensure CPU and IOMMU hardware capabilities
are met.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/iommu/intel-svm.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index e9773d714862..924a4de84be1 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -238,6 +238,9 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (!iommu || dmar_disabled)
return -EINVAL;

+ if (!intel_svm_capable(iommu))
+ return -ENOTSUPP;
+
if (dev_is_pci(dev)) {
pasid_max = pci_max_pasids(to_pci_dev(dev));
if (pasid_max < 0)
--
2.7.4