diff mbox series

[5.10,129/142] iommu/vt-d: Correctly check addr alignment in qi_flush_dev_iotlb_pasid()

Message ID 20210202133003.020070161@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Feb. 2, 2021, 1:38 p.m. UTC
From: Lu Baolu <baolu.lu@linux.intel.com>

[ Upstream commit 494b3688bb11a21af12e92a344a1313486693d47 ]

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@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20210119043500.1539596-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/intel/dmar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 004feaed3c72c..02e7c10a4224b 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);