Patch "iommu/vt-d: Really use upper context table when necessary" has been added to the 4.1-stable tree

Patch "iommu/vt-d: Really use upper context table when necessary" has been added to the 4.1-stable tree

[gregkh]

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

    iommu/vt-d: Really use upper context table when necessary

to the 4.1-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-really-use-upper-context-table-when-necessary.patch
and it can be found in the queue-4.1 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 4df4eab168c1c4058603be55a3169d4a45779cc0 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <jroedel@suse.de>
Date: Tue, 25 Aug 2015 10:54:28 +0200
Subject: iommu/vt-d: Really use upper context table when necessary

From: Joerg Roedel <jroedel@suse.de>

commit 4df4eab168c1c4058603be55a3169d4a45779cc0 upstream.

There is a bug in iommu_context_addr() which will always use
the lower context table, even when the upper context table
needs to be used. Fix this issue.

Fixes: 03ecc32c5274 ("iommu/vt-d: support extended root and context entries")
Reported-by: Xiao, Nan <nan.xiao@hp.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -681,6 +681,7 @@ static inline struct context_entry *iomm
 	struct context_entry *context;
 	u64 *entry;
 
+	entry = &root->lo;
 	if (ecs_enabled(iommu)) {
 		if (devfn >= 0x80) {
 			devfn -= 0x80;
@@ -688,7 +689,6 @@ static inline struct context_entry *iomm
 		}
 		devfn *= 2;
 	}
-	entry = &root->lo;
 	if (*entry & 1)
 		context = phys_to_virt(*entry & VTD_PAGE_MASK);
 	else {


Patches currently in stable-queue which might be from jroedel@suse.de are

queue-4.1/iommu-vt-d-really-use-upper-context-table-when-necessary.patch
queue-4.1/iommu-fsl-really-fix-init-section-s-content.patch
queue-4.1/iommu-io-pgtable-arm-unmap-and-free-table-when-overwriting-with-block.patch