On Wed, Jul 05, 2017 at 09:36:32PM +0800, Fam Zheng wrote: > Allow block driver to map and unmap a buffer for later I/O, as a performance > hint.
The name blk_dma_map() is confusing since other "dma" APIs like dma_addr_t and dma_blk_io() deal with guest physical addresses instead of host addresses. They are about DMA to/from guest RAM. Have you considered hiding this cached mapping in block/nvme.c so that it isn't exposed? block/nvme.c could keep the last buffer mapped and callers would get the performance benefit without a new blk_dma_map() API.
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