Patch "iommu/vt-d: Tylersburg isoch identity map check is done too late." has been added to the 4.4-stable tree

Patch "iommu/vt-d: Tylersburg isoch identity map check is done too late." has been added to the 4.4-stable tree

[gregkh]

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

    iommu/vt-d: Tylersburg isoch identity map check is done too late.

to the 4.4-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-vt-d-tylersburg-isoch-identity-map-check-is-done-too-late.patch
and it can be found in the queue-4.4 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 21e722c4c8377b5bc82ad058fed12165af739c1b Mon Sep 17 00:00:00 2001
From: Ashok Raj <ashok.raj@intel.com>
Date: Mon, 30 Jan 2017 09:39:53 -0800
Subject: iommu/vt-d: Tylersburg isoch identity map check is done too late.

From: Ashok Raj <ashok.raj@intel.com>

commit 21e722c4c8377b5bc82ad058fed12165af739c1b upstream.

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@8bytes.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Cc: Ashok Raj <ashok.raj@intel.com>

Fixes: 86080ccc22 ("iommu/vt-d: Allocate si_domain in init_dmars()")
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Reported-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3238,13 +3238,14 @@ 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


Patches currently in stable-queue which might be from ashok.raj@intel.com are

queue-4.4/iommu-vt-d-fix-some-macros-that-are-incorrectly-specified-in-intel-iommu.patch
queue-4.4/iommu-vt-d-tylersburg-isoch-identity-map-check-is-done-too-late.patch