DMA (direct memory access) resource allocation method for virtual machine under sun4v architecture
A resource allocation and virtual machine technology, applied in the field of virtual machine DMA resource allocation, can solve the problems of the Feiteng processor platform being difficult to exert its processing power, unable to exert its processing power, unable to use equipment, etc., to achieve high flexibility and adaptability, improve Overall IO performance and the effect of minimizing performance loss
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[0042] The virtual machine environment of this embodiment is a Feiteng processor platform based on the sun4v architecture, the control domain has a PCIE bus (specified in MD), and the client domain has no physical PCIE bus device.
[0043] Such as Figure 5 As shown, the implementation steps of the virtual machine DMA resource allocation method under the sun4v architecture in this embodiment are as follows:
[0044] 1) Both the control domain and the guest domain of the virtual machine reserve the global reserved virtual address space for DMA operations when the operating system is started, and the control domain and the guest domain are respectively established to use the DMA virtual address in the global reserved virtual address space An address translation page table (IOTSB) that translates to physical memory addresses;
[0045] 2) The client domain to be operated by DMA negotiates with the control domain to obtain a DMA virtual address, and the control domain allocates a ...
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