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virtio_ring: introduce dma map api for virtqueue
Added virtqueue_dma_map_api* to map DMA addresses for virtual memory in advance. The purpose is to keep memory mapped across multiple add/get buf operations. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Message-Id: <20230810123057.43407-11-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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