From 6eba09a4b5d583ad18a2a1fd1b82aee8cc3ac542 Mon Sep 17 00:00:00 2001
From: Jacob Pan <jacob.jun.pan@linux.intel.com>
Date: Thu, 2 Jan 2020 08:18:05 +0800
Subject: [PATCH] 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>
---
 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 e4a5d542b84f..48205ab1fea4 100644
--- 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)