linux-kernel - [PATCH v5 20/23] iommu/intel-svm: do not flush iotlb for viommu

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Message-Id: <1526072055-86990-21-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Fri, 11 May 2018 13:54:12 -0700
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>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Jean Delvare <khali@...ux-fr.org>,
        "Christoph Hellwig" <hch@...radead.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v5 20/23] iommu/intel-svm: do not flush iotlb for viommu

vIOMMU passdown invalidation will be inclusive, PASID cache invalidation
includes TLBs. See Intel VT-d Specification Ch 6.5.2.2 for details.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/intel-svm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index bdda1b6..697d5c2 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -284,7 +284,9 @@ static void intel_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdev, &svm->devs, list) {
 		intel_flush_pasid_dev(svm, sdev, svm->pasid);
-		intel_flush_svm_range_dev(svm, sdev, 0, -1, 0, !svm->mm);
+		/* for emulated iommu, PASID cache invalidation implies IOTLB/DTLB */
+		if (!cap_caching_mode(svm->iommu->cap))
+			intel_flush_svm_range_dev(svm, sdev, 0, -1, 0, !svm->mm);
 	}
 	rcu_read_unlock();
 
-- 
2.7.4