Cross-bus-domain host machine space access method and system, terminal and medium

The invention discloses a cross-bus-domain host machine space access method and system, a terminal and a medium, and the method comprises the steps: obtaining request access information for accessing an equipment borrowing party by virtual equipment in an equipment borrowing party, and determining a request address of the request access information; acquiring a real address accessed by the virtual device to the device borrowing party based on the BAR space of the connection bridge, and replacing the request address with the real address; and forwarding the real address to a bus domain of the equipment borrower based on the connection bridge. According to the method, the device borrowing party can be accessed from the virtualized device, DMA and MSI/MSI-X operations of the virtualized device are supported, and the read operation performance can be improved by reasonably caching the address of the Memory read operation sent by the virtualized device. 本发明公开了跨总线域的对宿主机空间访问方法、系统、终端及介质，方法包括：获取设备出借方中被虚拟设备对设备借用方进行访问的请