linux-kernel - [PATCH 1/1] iommu/vt-d: Correctly check addr alignment in qi_flush_dev_iotlb

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Message-Id: <20210119043500.1539596-1-baolu.lu@linux.intel.com>
Date:   Tue, 19 Jan 2021 12:35:00 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>
Cc:     Ashok Raj <ashok.raj@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Guo Kaijie <Kaijie.Guo@...el.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 1/1] iommu/vt-d: Correctly check addr alignment in qi_flush_dev_iotlb_pasid()

An incorrect address mask is being used in the qi_flush_dev_iotlb_pasid()
to check the address alignment. This leads to a lot of spurious kernel
warnings:

[  485.837093] DMAR: Invalidate non-aligned address 7f76f47f9000, order 0
[  485.837098] DMAR: Invalidate non-aligned address 7f76f47f9000, order 0
[  492.494145] qi_flush_dev_iotlb_pasid: 5734 callbacks suppressed
[  492.494147] DMAR: Invalidate non-aligned address 7f7728800000, order 11
[  492.508965] DMAR: Invalidate non-aligned address 7f7728800000, order 11

Fix it by checking the alignment in right way.

Fixes: 288d08e780088 ("iommu/vt-d: Handle non-page aligned address")
Reported-and-tested-by: Guo Kaijie <Kaijie.Guo@...el.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Liu Yi L <yi.l.liu@...el.com>
---
 drivers/iommu/intel/dmar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 004feaed3c72..02e7c10a4224 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -1496,7 +1496,7 @@ void qi_flush_dev_iotlb_pasid(struct intel_iommu *iommu, u16 sid, u16 pfsid,
 	 * Max Invs Pending (MIP) is set to 0 for now until we have DIT in
 	 * ECAP.
 	 */
-	if (addr & GENMASK_ULL(size_order + VTD_PAGE_SHIFT, 0))
+	if (!IS_ALIGNED(addr, VTD_PAGE_SIZE << size_order))
 		pr_warn_ratelimited("Invalidate non-aligned address %llx, order %d\n",
 				    addr, size_order);
 
-- 
2.25.1