6bb68f96a0
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> (cherry picked from commit 780bc7903a32edb63be138487fd981694d993610) Bug: 121166534 Test: Ran cuttlefish with android-4.4 + VSOCKETS, VMWARE_VMCI_VSOCKETS Signed-off-by: Alistair Strachan <astrachan@google.com> Change-Id: I0b21ea8a054df791fe114a10701a1120341806ce |
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| .. | ||
| asm | ||
| linux | ||
| uapi/linux | ||
| vhost_test | ||
| virtio-trace | ||
| .gitignore | ||
| Makefile | ||
| virtio_test.c | ||
| vringh_test.c | ||