This fixes virtio on Xen guests as well as on any other platform
that uses virtio_pci 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.
This should be safe on all platforms that I'm aware of. That
doesn't mean that there isn't anything that I missed.
Thanks to everyone for putting up with the development of this
series. Hopefully it'll be the end of DMA issues in virtio. :)
Changes from v3:
- virtio_pci only asks virtio_ring to use the DMA_API if
!PCI_DMA_BUS_IS_PHYS.
- Reduce tools/virtio breakage. It's now merely as broken as before
instead of being even more broken.
- Drop the sg_next changes -- Rusty's version is better.
Changes from v2:
- Reordered patches.
- Fixed a virtio_net OOPS.
Changes from v1:
- Using the DMA API is optional now. It would be nice to improve the
DMA API to the point that it could be used unconditionally, but s390
proves that we're not there yet.
- Includes patch 4, which fixes DMA debugging warnings from virtio_net.
Andy Lutomirski (4):
virtio_ring: Support DMA APIs if requested
virtio_pci: Use the DMA API for virtqueues
virtio_net: Don't set the end flag on reusable sg entries
virtio_net: Stop doing DMA from the stack
drivers/lguest/lguest_device.c | 3 +-
drivers/misc/mic/card/mic_virtio.c | 2 +-
drivers/net/virtio_net.c | 59 +++++++----
drivers/remoteproc/remoteproc_virtio.c | 4 +-
drivers/s390/kvm/kvm_virtio.c | 2 +-
drivers/s390/kvm/virtio_ccw.c | 4 +-
drivers/virtio/virtio_mmio.c | 5 +-
drivers/virtio/virtio_pci.c | 41 ++++++--
drivers/virtio/virtio_ring.c | 187 +++++++++++++++++++++++++++++----
include/linux/virtio_ring.h | 1 +
tools/virtio/linux/dma-mapping.h | 17 +++
tools/virtio/linux/virtio.h | 1 +
tools/virtio/virtio_test.c | 2 +-
tools/virtio/vringh_test.c | 3 +-
14 files changed, 268 insertions(+), 63 deletions(-)
create mode 100644 tools/virtio/linux/dma-mapping.h
--
1.9.3
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