iommu/vt-d: Reject SVM bind for failed capability check

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>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index e4a5d542b84fca5d84ab9f14e73492d676322257..48205ab1fea45abaa063a689e5c6ba399f5add58 100644 (file)
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -234,6 +234,9 @@ 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)