linux-kernel - [PATCH 2/4] iommu/vt-d: Set context field after value initialized

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190301032313.9311-3-baolu.lu@linux.intel.com>
Date:   Fri,  1 Mar 2019 11:23:11 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     ashok.raj@...el.com, jacob.jun.pan@...el.com, kevin.tian@...el.com,
        yi.l.liu@...el.com, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH 2/4] iommu/vt-d: Set context field after value initialized

Otherwise, the translation type field of a context entry for
a PCI device will always be 0. All translated DMA requests
will be blocked by IOMMU. As the result, the PCI devices with
PCI ATS (device IOTBL) support won't work as expected.

Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Suggested-by: Kevin Tian <kevin.tian@...el.com>
Fixes: 7373a8cc38197 ("iommu/vt-d: Setup context and enable RID2PASID support")
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.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 abdd165a829c..c968b3c7bae0 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2056,7 +2056,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
 		int agaw;
 
 		context_set_domain_id(context, did);
-		context_set_translation_type(context, translation);
 
 		if (translation != CONTEXT_TT_PASS_THROUGH) {
 			/*
@@ -2086,6 +2085,8 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
 			 */
 			context_set_address_width(context, iommu->msagaw);
 		}
+
+		context_set_translation_type(context, translation);
 	}
 
 	context_set_fault_enable(context);
-- 
2.17.1