On Tue, Oct 27, 2015 at 06:17:10PM -0700, Andy Lutomirski wrote: > From: Andy Lutomirski <luto@xxxxxxxxxxxxxx> > > This fixes virtio-pci on platforms and busses that have IOMMUs. This > will break the experimental QEMU Q35 IOMMU support until QEMU is > fixed. In exchange, it fixes physical virtio hardware as well as > virtio-pci running under Xen. > > We should clean up the virtqueue API to do its own allocation and > teach virtqueue_get_avail and virtqueue_get_used to return DMA > addresses directly. > > Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx> > --- > drivers/virtio/virtio_pci_common.h | 3 ++- > drivers/virtio/virtio_pci_legacy.c | 19 +++++++++++++++---- > drivers/virtio/virtio_pci_modern.c | 34 ++++++++++++++++++++++++---------- > 3 files changed, 41 insertions(+), 15 deletions(-) Same here, you need to call the dma_sync* functions when passing data from/to the virtio-device. I think a good test for that is to boot a virtio kvm-guest with swiotlb=force and see if it still works. Joerg -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
