This fixes virtio on Xen guests as well as on any other platform on
which physical addresses don't match bus addresses.
This can be tested with:
virtme-run --xen xen --kimg arch/x86/boot/bzImage --console
using virtme from here:
https://git.kernel.org/cgit/utils/kernel/virtme/virtme.git
Without these patches, the guest hangs forever. With these patches,
everything works.
There are two outstanding issues. virtio_net warns if DMA debugging
is on because it does DMA from the stack. (The warning is correct.)
This also is likely to do something unpleasant to s390.
(Maintainers are cc'd -- I don't know what to do about it.)
Andy Lutomirski (3):
virtio_ring: Remove sg_next indirection
virtio_ring: Use DMA APIs
virtio_pci: Use the DMA API for virtqueues
drivers/virtio/Kconfig | 1 +
drivers/virtio/virtio_pci.c | 25 ++++++--
drivers/virtio/virtio_ring.c | 150 ++++++++++++++++++++++++++++++-------------
3 files changed, 125 insertions(+), 51 deletions(-)
--
1.9.3
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