The current virtqueue_avail_bytes() is a weird API: it's oddly-named:
doesn't tell us what the API is going to do, and also suits just one
use-case (that in virtio-net.c).
Introduce virtqueue_get_avail_bytes(), which returns the number of
bytes in the vq available for input as well as output.
virtqueue_avail_bytes() is made a wrapper around this new function for
now. It should be deprecated soon, though.
Doing this will also help with the virtio-rng patch where a
VirtQueueElement is popped only to find out what its size is. With
this series applied, the popping (and the subsequent save/load of
state for migration) isn't necessary.
The virtio-serial-bus code becomes better too, that's patch 3 here.
Please apply,
Amit Shah (3):
virtio: use unsigned int for counting bytes in vq
virtio: Introduce virtqueue_get_avail_bytes()
virtio-serial-bus: let chardev know the exact number of bytes
requested
hw/virtio-serial-bus.c | 11 +++--------
hw/virtio.c | 30 ++++++++++++++++++++++--------
hw/virtio.h | 5 ++++-
3 files changed, 29 insertions(+), 17 deletions(-)
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1.7.7.6
