This is a note to let you know that I've just added the patch titled xhci: remove GFP_DMA flag from allocation 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: xhci-remove-gfp_dma-flag-from-allocation.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 5db851cf20857c5504b146046e97cb7781f2a743 Mon Sep 17 00:00:00 2001 From: Matthias Lange <matthias.lange@xxxxxxxxxxxxxxx> Date: Wed, 17 May 2017 18:32:04 +0300 Subject: xhci: remove GFP_DMA flag from allocation From: Matthias Lange <matthias.lange@xxxxxxxxxxxxxxx> commit 5db851cf20857c5504b146046e97cb7781f2a743 upstream. There is no reason to restrict allocations to the first 16MB ISA DMA addresses. It is causing problems in a virtualization setup with enabled IOMMU (x86_64). The result is that USB is not working in the VM. Signed-off-by: Matthias Lange <matthias.lange@xxxxxxxxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/host/xhci-mem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -56,7 +56,7 @@ static struct xhci_segment *xhci_segment } if (max_packet) { - seg->bounce_buf = kzalloc(max_packet, flags | GFP_DMA); + seg->bounce_buf = kzalloc(max_packet, flags); if (!seg->bounce_buf) { dma_pool_free(xhci->segment_pool, seg->trbs, dma); kfree(seg); Patches currently in stable-queue which might be from matthias.lange@xxxxxxxxxxxxxxx are queue-4.9/xhci-remove-gfp_dma-flag-from-allocation.patch