diff options
| author |   Andy Lutomirski <luto@kernel.org> | 2016-02-02 21:46:36 -0800 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2016-03-02 17:01:57 +0200 |
| commit | 780bc7903a32edb63be138487fd981694d993610 (patch) | |
| tree | b1893866fc5223937f84afe43b03eb1af1964fd6 /drivers/virtio/Kconfig | |
| parent | vring: Introduce vring_use_dma_api() (diff) | |
| download | linux-dev-780bc7903a32edb63be138487fd981694d993610.tar.xz linux-dev-780bc7903a32edb63be138487fd981694d993610.zip | |
virtio_ring: Support DMA APIs
virtio_ring currently sends the device (usually a hypervisor)
physical addresses of its I/O buffers. This is okay when DMA
addresses and physical addresses are the same thing, but this isn't
always the case. For example, this never works on Xen guests, and
it is likely to fail if a physical "virtio" device ever ends up
behind an IOMMU or swiotlb.
The immediate use case for me is to enable virtio on Xen guests.
For that to work, we need vring to support DMA address translation
as well as a corresponding change to virtio_pci or to another
driver.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio/Kconfig')
| -rw-r--r-- | drivers/virtio/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index cab9f3f63a38..77590320d44c 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -60,7 +60,7 @@ config VIRTIO_INPUT config VIRTIO_MMIO tristate "Platform bus driver for memory mapped virtio devices" - depends on HAS_IOMEM + depends on HAS_IOMEM && HAS_DMA select VIRTIO ---help--- This drivers provides support for memory mapped virtio |