linux-kernel - [PATCH v2 2/4] iommu/vt-d: Set PGSNP bit in pasid table entry for SVA binding

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Date:   Thu, 21 Apr 2022 19:35:56 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jacob jun Pan <jacob.jun.pan@...el.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Liu Yi L <yi.l.liu@...el.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 2/4] iommu/vt-d: Set PGSNP bit in pasid table entry for SVA binding

This field make the requests snoop processor caches irrespective of
other attributes in the request or other fields in paging structure
entries used to translate the request.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/svm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 23a38763c1d1..c720d1be992d 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -391,9 +391,12 @@ static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
 	}
 
 	/* Setup the pasid table: */
-	sflags = (flags & SVM_FLAG_SUPERVISOR_MODE) ?
-			PASID_FLAG_SUPERVISOR_MODE : 0;
-	sflags |= cpu_feature_enabled(X86_FEATURE_LA57) ? PASID_FLAG_FL5LP : 0;
+	sflags = PASID_FLAG_PAGE_SNOOP;
+	if (flags & SVM_FLAG_SUPERVISOR_MODE)
+		sflags |= PASID_FLAG_SUPERVISOR_MODE;
+	if (cpu_feature_enabled(X86_FEATURE_LA57))
+		sflags |= PASID_FLAG_FL5LP;
+
 	spin_lock_irqsave(&iommu->lock, iflags);
 	ret = intel_pasid_setup_first_level(iommu, dev, mm->pgd, mm->pasid,
 					    FLPT_DEFAULT_DID, sflags);
-- 
2.25.1