| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 158/172] iommu/dma: Dont reserve PCI I/O windows | Date | Mon, 3 Jul 2017 15:35:38 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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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 @@ -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);
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