linux-kernel - [PATCH v2 1/2] iommu/vt-d: Fix sid not set issue in intel_svm_bind

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Date:   Fri, 30 Oct 2020 10:37:23 +0800
From:   Yi Sun <yi.y.sun@...ux.intel.com>
To:     joro@...tes.org, dwmw2@...radead.org, baolu.lu@...ux.intel.com,
        jean-philippe@...aro.org
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        yi.l.liu@...el.com, jacob.jun.pan@...ux.intel.com,
        Yi Sun <yi.y.sun@...ux.intel.com>
Subject: [PATCH v2 1/2] iommu/vt-d: Fix sid not set issue in intel_svm_bind_gpasid()

From: Liu Yi L <yi.l.liu@...el.com>

Should get correct sid and set it into sdev. Because we execute
'sdev->sid != req->rid' in the loop of prq_event_thread().

Fixes: eb8d93ea3c1d ("iommu/vt-d: Report page request faults for guest SVA")
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
Signed-off-by: Yi Sun <yi.y.sun@...ux.intel.com>
---
 drivers/iommu/intel/svm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index f1861fa..7584669 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -279,6 +279,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
 	struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
 	struct intel_svm_dev *sdev = NULL;
 	struct dmar_domain *dmar_domain;
+	struct device_domain_info *info;
 	struct intel_svm *svm = NULL;
 	int ret = 0;
 
@@ -310,6 +311,10 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
 	if (data->hpasid <= 0 || data->hpasid >= PASID_MAX)
 		return -EINVAL;
 
+	info = get_domain_info(dev);
+	if (!info)
+		return -EINVAL;
+
 	dmar_domain = to_dmar_domain(domain);
 
 	mutex_lock(&pasid_mutex);
@@ -357,6 +362,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
 		goto out;
 	}
 	sdev->dev = dev;
+	sdev->sid = PCI_DEVID(info->bus, info->devfn);
 
 	/* Only count users if device has aux domains */
 	if (iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX))
-- 
2.7.4