On Tue, Oct 27, 2015 at 06:17:10PM -0700, Andy Lutomirski wrote:
> From: Andy Lutomirski <[email protected]>
>
> 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 <[email protected]>
> ---
> 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
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