Patch "iommu/dma: Don't reserve PCI I/O windows" has been added to the 4.11-stable tree

Patch "iommu/dma: Don't reserve PCI I/O windows" has been added to the 4.11-stable tree

[gregkh]

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

    iommu/dma: Don't reserve PCI I/O windows

to the 4.11-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-dma-don-t-reserve-pci-i-o-windows.patch
and it can be found in the queue-4.11 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 938f1bbe35e3a7cb07e1fa7c512e2ef8bb866bdf Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@arm.com>
Date: Thu, 16 Mar 2017 17:00:17 +0000
Subject: iommu/dma: Don't reserve PCI I/O windows

From: Robin Murphy <robin.murphy@arm.com>

commit 938f1bbe35e3a7cb07e1fa7c512e2ef8bb866bdf upstream.

Even if a host controller's CPU-side MMIO windows into PCI I/O space do
happen to leak into PCI memory space such that it might treat them as
peer addresses, trying to reserve the corresponding I/O space addresses
doesn't do anything to help solve that problem. Stop doing a silly thing.

Fixes: fade1ec055dc ("iommu/dma: Avoid PCI host bridge windows")
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iommu/dma-iommu.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -175,8 +175,7 @@ static void iova_reserve_pci_windows(str
 	unsigned long lo, hi;
 
 	resource_list_for_each_entry(window, &bridge->windows) {
-		if (resource_type(window->res) != IORESOURCE_MEM &&
-		    resource_type(window->res) != IORESOURCE_IO)
+		if (resource_type(window->res) != IORESOURCE_MEM)
 			continue;
 
 		lo = iova_pfn(iovad, window->res->start - window->offset);


Patches currently in stable-queue which might be from robin.murphy@arm.com are

queue-4.11/iommu-dma-don-t-reserve-pci-i-o-windows.patch