virtio: Factor virtqueue_map_sg out
Separate the mapping of requests to host memory from the descriptor iteration.
The next patch will make use of it in a different context.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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Separate the mapping of requests to host memory from the descriptor iteration.
The next patch will make use of it in a different context.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>