| 摘要 |
A method and system for copying data within a guest using a direct memory access (DMA) engine. A computer system hosts a hypervisor and a guest. The hypervisor detects an inquiry of the guest about a DMA engine. In response to the inquiry, the hypervisor indicates to the guest that a DMA engine is available. The hypervisor then receives a DMA request from the guest, the DMA request indicating a source address and a target address for copying data. Both the source address and the target address are within an address space allocated to the guest. Based on one or more data transfer policies, the hypervisor determines whether to direct the DMA engine to copy the data for the guest.
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