Patch "iommu/arm-smmu: Set privileged attribute to 'default' instead of 'unprivileged'" has been added to the 4.9-stable tree

Patch "iommu/arm-smmu: Set privileged attribute to 'default' instead of 'unprivileged'" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    iommu/arm-smmu: Set privileged attribute to 'default' instead of 'unprivileged'

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iommu-arm-smmu-set-privileged-attribute-to-default-instead-of-unprivileged.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct  5 10:28:31 CEST 2017
From: Sricharan R <sricharan@codeaurora.org>
Date: Fri, 6 Jan 2017 18:58:15 +0530
Subject: iommu/arm-smmu: Set privileged attribute to 'default' instead of 'unprivileged'

From: Sricharan R <sricharan@codeaurora.org>


[ Upstream commit e19898077cfb642fe151ba22981e795c74d9e114 ]

Currently the driver sets all the device transactions privileges
to UNPRIVILEGED, but there are cases where the iommu masters wants
to isolate privileged supervisor and unprivileged user.
So don't override the privileged setting to unprivileged, instead
set it to default as incoming and let it be controlled by the pagetable
settings.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iommu/arm-smmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1211,7 +1211,7 @@ static int arm_smmu_domain_add_master(st
 			continue;
 
 		s2cr[idx].type = type;
-		s2cr[idx].privcfg = S2CR_PRIVCFG_UNPRIV;
+		s2cr[idx].privcfg = S2CR_PRIVCFG_DEFAULT;
 		s2cr[idx].cbndx = cbndx;
 		arm_smmu_write_s2cr(smmu, idx);
 	}


Patches currently in stable-queue which might be from sricharan@codeaurora.org are

queue-4.9/iommu-arm-smmu-set-privileged-attribute-to-default-instead-of-unprivileged.patch