linux-kernel - [PATCH 5.10 124/145] iommu/vt-d: Move intel_iommu info from struct intel_svm to struct intel_svm

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Message-Id: <20210111130054.465822290@linuxfoundation.org>
Date:   Mon, 11 Jan 2021 14:02:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Raj Ashok <ashok.raj@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Guo Kaijie <Kaijie.Guo@...el.com>,
        Xin Zeng <xin.zeng@...el.com>, Liu Yi L <yi.l.liu@...el.com>,
        Will Deacon <will@...nel.org>
Subject: [PATCH 5.10 124/145] iommu/vt-d: Move intel_iommu info from struct intel_svm to struct intel_svm_dev

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

commit 9ad9f45b3b91162b33abfe175ae75ab65718dbf5 upstream.

'struct intel_svm' is shared by all devices bound to a give process,
but records only a single pointer to a 'struct intel_iommu'. Consequently,
cache invalidations may only be applied to a single DMAR unit, and are
erroneously skipped for the other devices.

In preparation for fixing this, rework the structures so that the iommu
pointer resides in 'struct intel_svm_dev', allowing 'struct intel_svm'
to track them in its device list.

Fixes: 1c4f88b7f1f9 ("iommu/vt-d: Shared virtual address in scalable mode")
Cc: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Raj Ashok <ashok.raj@...el.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Reported-by: Guo Kaijie <Kaijie.Guo@...el.com>
Reported-by: Xin Zeng <xin.zeng@...el.com>
Signed-off-by: Guo Kaijie <Kaijie.Guo@...el.com>
Signed-off-by: Xin Zeng <xin.zeng@...el.com>
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
Tested-by: Guo Kaijie <Kaijie.Guo@...el.com>
Cc: stable@...r.kernel.org # v5.0+
Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
Link: https://lore.kernel.org/r/1609949037-25291-2-git-send-email-yi.l.liu@intel.com
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/intel/svm.c   |    9 +++++----
 include/linux/intel-iommu.h |    2 +-
 2 files changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -142,7 +142,7 @@ static void intel_flush_svm_range_dev (s
 	}
 	desc.qw2 = 0;
 	desc.qw3 = 0;
-	qi_submit_sync(svm->iommu, &desc, 1, 0);
+	qi_submit_sync(sdev->iommu, &desc, 1, 0);
 
 	if (sdev->dev_iotlb) {
 		desc.qw0 = QI_DEV_EIOTLB_PASID(svm->pasid) |
@@ -166,7 +166,7 @@ static void intel_flush_svm_range_dev (s
 		}
 		desc.qw2 = 0;
 		desc.qw3 = 0;
-		qi_submit_sync(svm->iommu, &desc, 1, 0);
+		qi_submit_sync(sdev->iommu, &desc, 1, 0);
 	}
 }
 
@@ -211,7 +211,7 @@ static void intel_mm_release(struct mmu_
 	 */
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdev, &svm->devs, list)
-		intel_pasid_tear_down_entry(svm->iommu, sdev->dev,
+		intel_pasid_tear_down_entry(sdev->iommu, sdev->dev,
 					    svm->pasid, true);
 	rcu_read_unlock();
 
@@ -363,6 +363,7 @@ int intel_svm_bind_gpasid(struct iommu_d
 	}
 	sdev->dev = dev;
 	sdev->sid = PCI_DEVID(info->bus, info->devfn);
+	sdev->iommu = iommu;
 
 	/* Only count users if device has aux domains */
 	if (iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX))
@@ -546,6 +547,7 @@ intel_svm_bind_mm(struct device *dev, un
 		goto out;
 	}
 	sdev->dev = dev;
+	sdev->iommu = iommu;
 
 	ret = intel_iommu_enable_pasid(iommu, dev);
 	if (ret) {
@@ -575,7 +577,6 @@ intel_svm_bind_mm(struct device *dev, un
 			kfree(sdev);
 			goto out;
 		}
-		svm->iommu = iommu;
 
 		if (pasid_max > intel_pasid_max_id)
 			pasid_max = intel_pasid_max_id;
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -758,6 +758,7 @@ struct intel_svm_dev {
 	struct list_head list;
 	struct rcu_head rcu;
 	struct device *dev;
+	struct intel_iommu *iommu;
 	struct svm_dev_ops *ops;
 	struct iommu_sva sva;
 	u32 pasid;
@@ -771,7 +772,6 @@ struct intel_svm {
 	struct mmu_notifier notifier;
 	struct mm_struct *mm;
 
-	struct intel_iommu *iommu;
 	unsigned int flags;
 	u32 pasid;
 	int gpasid; /* In case that guest PASID is different from host PASID */