From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacob Pan Subject: [PATCH v5 20/23] iommu/intel-svm: do not flush iotlb for viommu Date: Fri, 11 May 2018 13:54:12 -0700 Message-ID: <1526072055-86990-21-git-send-email-jacob.jun.pan@linux.intel.com> References: <1526072055-86990-1-git-send-email-jacob.jun.pan@linux.intel.com> Return-path: In-Reply-To: <1526072055-86990-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Greg Kroah-Hartman , Alex Williamson , Jean-Philippe Brucker Cc: Rafael Wysocki , "Liu, Yi L" , "Tian, Kevin" , Raj Ashok , Jean Delvare , Christoph Hellwig , Lu Baolu , Jacob Pan List-Id: iommu@lists.linux-foundation.org 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 --- 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