[Qemu-devel] [PATCH 0/2] virtio len fixes for qemu.

[Rusty Russell <rusty@rustcorp.com.au>]

The virtio 'used' ring describes descriptors which have been used.  It
also says how many bytes have been written to the ring.  For some cases,
this value is ignored by Linux guests, thus errors have not been noticed.
I was working on increasing the checking in Linux when I noticed this
behaviour.

The first patch changes the 'len' formal parameter name to 'len_written' to
make the API clearer, and adds an assert(). The second fixes block writes.

Cheers,
Rusty.
PS.  It's based on MST's virtio-1.0 tree, but should be easily ported.

Rusty Russell (2):
  virtio: make it clear that "len" for a used descriptor is len written.
  virtio-blk: fix length calculations for write operations.

 hw/block/virtio-blk.c      |  9 ++++++++-
 hw/virtio/virtio.c         | 19 ++++++++++++-------
 include/hw/virtio/virtio.h |  4 ++--
 3 files changed, 22 insertions(+), 10 deletions(-)

-- 
2.1.0