linux-kernel - [PATCH v4 3/8] iommu/vt-d: Reject SVM bind for failed capability check

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Message-Id: <1574371588-65634-4-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Thu, 21 Nov 2019 13:26:23 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>, "Yi Liu" <yi.l.liu@...el.com>,
        Eric Auger <eric.auger@...hat.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v4 3/8] 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@...ux.intel.com>
Reviewed-by: Eric Auger <eric.auger@...hat.com>
Acked-by: Lu Baolu <baolu.lu@...ux.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 716c543488f6..74df10a39dfc 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