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 4.9-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-dma-don-t-reserve-pci-i-o-windows.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@xxxxxxxxxxxxxxx> know about it.
>From 938f1bbe35e3a7cb07e1fa7c512e2ef8bb866bdf Mon Sep 17 00:00:00 2001
From: Robin Murphy <robin.murphy@xxxxxxx>
Date: Thu, 16 Mar 2017 17:00:17 +0000
Subject: iommu/dma: Don't reserve PCI I/O windows
From: Robin Murphy <robin.murphy@xxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -112,8 +112,7 @@ 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@xxxxxxx are
queue-4.9/iommu-handle-default-domain-attach-failure.patch
queue-4.9/iommu-dma-don-t-reserve-pci-i-o-windows.patch