linux-kernel - [PATCH v3 6/6] iommu/vt-d: Use iova over first level

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Message-Id: <20191211021219.8997-7-baolu.lu@linux.intel.com>
Date:   Wed, 11 Dec 2019 10:12:19 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     ashok.raj@...el.com, sanjay.k.kumar@...el.com,
        jacob.jun.pan@...ux.intel.com, kevin.tian@...el.com,
        yi.l.liu@...el.com, yi.y.sun@...el.com,
        Peter Xu <peterx@...hat.com>, iommu@...ts.linux-foundation.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v3 6/6] iommu/vt-d: Use iova over first level

After we make all map/unmap paths support first level page table.
Let's turn it on if hardware supports scalable mode.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index e47f5fe37b59..9228f121a040 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1749,15 +1749,13 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
 
 /*
  * Check and return whether first level is used by default for
- * DMA translation. Currently, we make it off by setting
- * first_level_support = 0, and will change it to -1 after all
- * map/unmap paths support first level page table.
+ * DMA translation.
  */
 static bool first_level_by_default(void)
 {
 	struct dmar_drhd_unit *drhd;
 	struct intel_iommu *iommu;
-	static int first_level_support = 0;
+	static int first_level_support = -1;
 
 	if (likely(first_level_support != -1))
 		return first_level_support;
-- 
2.17.1