linux-kernel - [PATCH 2/2] iommu/vt-d: tylersburg isoch identity map check is done too late.

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Message-Id: <1485534760-185590-2-git-send-email-ashok.raj@intel.com>
Date:   Fri, 27 Jan 2017 08:32:40 -0800
From:   Ashok Raj <ashok.raj@...el.com>
To:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     Ashok Raj <ashok.raj@...el.com>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH 2/2] iommu/vt-d: tylersburg isoch identity map check is done too late.

The check to set identity map for tylersburg is done too late. It needs
to be done before the check for identity_map domain is done.

To: Joerg Roedel <joro@...tes.org>
To: David Woodhouse <dwmw2@...radead.org>
Cc: iommu@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
Cc: Ashok Raj <ashok.raj@...el.com>

Signed-off-by: Ashok Raj <ashok.raj@...el.com>
Reported-by: Yunhong Jiang <yunhong.jiang@...el.com>
---
 drivers/iommu/intel-iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 8a18525..23eead3 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3325,13 +3325,14 @@ static int __init init_dmars(void)
 	iommu_identity_mapping |= IDENTMAP_GFX;
 #endif
 
+	check_tylersburg_isoch();
+
 	if (iommu_identity_mapping) {
 		ret = si_domain_init(hw_pass_through);
 		if (ret)
 			goto free_iommu;
 	}
 
-	check_tylersburg_isoch();
 
 	/*
 	 * If we copied translations from a previous kernel in the kdump
-- 
2.7.4